CN114336262A - Device and method for predicting laser pulse emission preparation time - Google Patents
Device and method for predicting laser pulse emission preparation time Download PDFInfo
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- CN114336262A CN114336262A CN202210245326.5A CN202210245326A CN114336262A CN 114336262 A CN114336262 A CN 114336262A CN 202210245326 A CN202210245326 A CN 202210245326A CN 114336262 A CN114336262 A CN 114336262A
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Abstract
The invention provides a device for predicting the preparation time of laser pulse emission and a method thereof, wherein the device comprises a light-emitting element and a first light-receiving element which are arranged in a laser resonant cavity, the light-emitting element emits light to a laser crystal and/or a saturable absorber, the first light-receiving element receives the transmitted light of the laser crystal and/or the saturable absorber and converts the transmitted light signal into an electric signal; the laser device further comprises a calculating unit, wherein the calculating unit is used for acquiring the electric signal from the first light receiving element, obtaining the transmissivity of the laser crystal and/or the saturable absorber and/or the transmissivity of the pump light in the laser crystal according to the electric signal, detecting the moment corresponding to the preset transmissivity value, and determining the moment as the pulse emission preparation moment of the laser. The laser device light pulse transmitting preparation time can be obtained by acquiring a transmission light signal and converting the transmission light signal into an electric signal through the first light receiving element arranged in the laser resonant cavity, acquiring the electric signal through the calculating unit connected with the electric signal and calculating the electric signal, and obtaining the laser device light pulse transmitting preparation time.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a device and a method for predicting the pulse emission preparation time of a laser.
Background
Currently, in many laser applications, the timing of the laser pulse emission needs to be known in advance. Such as: for laser ranging application, the emission time of laser pulses needs to be known and is used as a timing zero point; laser Induced Breakdown Spectroscopy (LIBS) or long range laser raman radar applications require a priori knowledge of the laser pulse launch preparation time in order to turn on spectrometer collection, etc.
At present, two detection schemes for zero signals of a laser are mainly used, one is to place a photodiode inside or outside the laser and obtain synchronous optical signals output by the laser through a light splitting device. After the light splitting, the photodiode is used for detecting the laser signal to know that the light-emitting time of the laser is detected only after the laser emits light, so that delay is inevitable, and the system error cannot be eliminated. Another method is to monitor the laser pulse emission of the laser by the design of the laser power controller, which controls the laser emission by the power supply, inevitably the measured zero signal error is large, and an error signal may occur due to the circuit controlling the light indirectly, for example, the power controller indicates the laser emission but the laser cavity does not emit light. In some precision measurements, it is more necessary to predict the laser pulse emission in advance, and the equipment presetting is done before the laser pulse emission.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an apparatus and a method for predicting a laser pulse emission preparation time, which can obtain a transmitted light signal of a laser crystal or a saturable absorber by a light emitting element, a first photo detecting element and a second photo detecting element disposed in a laser resonator, and predict the laser pulse emission preparation time by a calculating unit connected to the photo detecting unit, thereby accurately knowing the emission time of a laser pulse, being an active measurement signal, and obtaining an accurate and advanced laser zero point signal, and is particularly suitable for a situation where the emission of the laser needs to be predicted.
In a first aspect, the present invention provides a device for predicting a pulse emission preparation time of a laser, where the laser includes a laser resonator, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially disposed along an output beam direction, and the output beam passes through the laser crystal and the saturable absorber, the device includes:
a light emitting element disposed within the laser resonator, the light emitting element configured to emit light towards the laser crystal and/or the saturable absorber;
the first light receiving element is arranged in the laser resonant cavity and used for receiving the transmitted light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber and converting the received transmitted light signal into an electric signal;
and the calculation unit is connected with the light emitting element and the first light receiving element, and is used for controlling the light emitting element to emit light, acquiring the electric signal from the first light receiving element, obtaining the transmissivity of the laser crystal and/or the saturable absorber according to the electric signal, detecting the preset moment corresponding to the set value of the transmissivity, and determining the moment as the pulse emission preparation moment of the laser.
Further, the light emitting element comprises a first laser diode, and the first laser diode is connected with the computing unit;
the first light receiving element includes a first photodiode connected to the calculation unit;
the first laser diode and the first photodiode are symmetrically arranged on two sides of the saturable absorber;
the first laser diode is used for emitting first detection laser to the saturable absorber, and the first photodiode is used for receiving first transmission light of the first detection laser passing through the saturable absorber and converting the first transmission light signal into a first electric signal;
the calculation unit is used for controlling the first laser diode to emit laser, acquiring the first electric signal from the first photodiode, obtaining the transmissivity of the saturable absorber according to the first electric signal, detecting a moment corresponding to a preset value of the transmissivity of the saturable absorber, and determining the moment as a pulse emission preparation moment of the laser.
Further, the light emitting element comprises a second laser diode, and the second laser diode is connected with the computing unit;
the first light receiving element includes a second photodiode connected to the calculation unit;
the second laser diode and the second photodiode are symmetrically arranged on two sides of the laser crystal;
the second laser diode is used for emitting second detection laser to the laser crystal, and the second photodiode is used for receiving second transmission light of the second detection laser passing through the laser crystal and converting a second transmission light signal into a second electric signal;
the calculation unit is used for controlling the second laser diode to emit laser, acquiring the second electric signal from the second photodiode, obtaining the transmissivity of the laser crystal according to the second electric signal, detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
In a second aspect, the present invention further provides a device for predicting a laser pulse emission preparation time, where the laser includes a pump source, a laser resonator, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially disposed along an output beam direction of the pump source, an output beam of the pump source passes through the laser crystal and the saturable absorber, and the device includes:
the second light receiving element is arranged in the laser resonant cavity and used for receiving the transmission light of the pump light emitted by the pump source in the laser crystal and converting the transmission light signal into an electric signal;
and the calculating unit is connected with the second light receiving element and used for acquiring the electric signal from the second light receiving element, obtaining the transmissivity of the laser crystal according to the electric signal, detecting the time corresponding to the preset transmissivity set value and determining the time as the pulse emission preparation time of the laser.
Further, the second light receiving element comprises a third photodiode, and the third photodiode is arranged on one side surface of the laser crystal and connected with the computing unit;
the third photodiode is used for receiving third transmission light of the pump light emitted by the pump source in the laser crystal and converting a third transmission light signal into a third electric signal;
the calculation unit is configured to obtain the third electrical signal from the third photodiode, obtain the transmittance of the laser crystal according to the third electrical signal, detect a time corresponding to a preset value of the transmittance of the laser crystal, and determine the time as a pulse emission preparation time of the laser.
In a third aspect, the present invention further provides a method for predicting a laser pulse emission preparation time, where the laser includes a laser resonant cavity, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonant cavity, the laser resonant cavity is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially disposed along an output beam direction, the output beam passes through the laser crystal and the saturable absorber, and the apparatus for predicting a laser pulse emission preparation time includes a computing unit, where the method includes the following steps:
a light emitting element and a first light receiving element are arranged in the laser resonant cavity;
controlling the light emitting element to emit light to the laser crystal and/or the saturable absorber;
acquiring an electrical signal from the first light receiving element, wherein the electrical signal is obtained by receiving the transmitted light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber through the first light receiving element and converting the received transmitted light signal;
obtaining the transmissivity of the laser crystal and/or the saturable absorber according to the electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity, and determining the moment as the pulse emission preparation moment of the laser.
Further, the light emitting element includes a first laser diode connected to the computing unit, the first light receiving element includes a first photodiode connected to the computing unit; the first laser diode and the first photodiode are symmetrically arranged on two sides of the saturable absorber, and the method comprises the following steps:
controlling the first laser diode to emit first detection laser light to the saturable absorber;
acquiring a first electric signal from the first photodiode, wherein the first electric signal is obtained by receiving first transmitted light which is emitted by the first laser diode and passes through the saturable absorber through the first photodiode, and converting the received first transmitted light signal;
obtaining the transmissivity of the saturable absorber according to the first electric signal;
and detecting the time corresponding to the preset transmissivity set value of the saturable absorber, and determining the time as the pulse emission preparation time of the laser.
Further, the light emitting element includes a second laser diode connected to the computing unit, the first light receiving element includes a second photodiode connected to the computing unit; the second laser diode and the second photodiode are symmetrically arranged on two sides of the laser crystal, and the method comprises the following steps:
controlling the second laser diode to emit second detection laser to the laser crystal;
acquiring a second electric signal from the second photodiode, wherein the second electric signal is obtained by receiving second transmission light which is emitted by the second laser diode and passes through the laser crystal through the second photodiode and converting the received second transmission light signal;
obtaining the transmissivity of the laser crystal according to the second electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
In a fourth aspect, the present invention further provides a method for predicting a laser pulse emission preparation time, where the laser includes a pump source, a laser resonator, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially disposed along an output beam direction of the pump source, an output beam of the pump source passes through the laser crystal and the saturable absorber, and the apparatus for predicting a laser pulse emission preparation time includes a computing unit, and the method includes the following steps:
a second light receiving element is arranged in the laser resonant cavity;
acquiring an electrical signal from the second light receiving element, wherein the electrical signal is obtained by receiving the transmission light of the pump light emitted by the pump source and passing through the laser crystal through the second light receiving element and converting the transmission light signal;
obtaining the transmissivity of the laser crystal according to the electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
Further, the second light receiving element includes a third photodiode disposed on a side of the laser crystal and connected to the computing unit, and the method includes the steps of:
acquiring a third electric signal from the third photodiode, wherein the third electric signal receives third transmission light of the pump light emitted by the pump source in the laser crystal through the third photodiode, and the third transmission light signal is converted to obtain the third electric signal;
obtaining the transmissivity of the laser crystal according to the third electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
According to the device and the method for preparing the laser pulse emission time, the light-emitting element, the first light receiving element and the second light receiving element are arranged in the laser cavity, and the relation between the transmittance and the population inversion is obtained through the first light receiving element and the second light receiving element respectively, so that the time of the transmittance when the population inversion is close to the maximum is determined in the laser generation process, and the light emitting time of the laser pulse fast emission is predicted.
Specifically, by monitoring the transmittance of the saturable absorber, the absorption coefficient of the saturable absorber to the pump light output by the pump source decreases with the increase of the incident light intensity, and the applicant of the present application confirms that the relation between the transmission coefficient of the saturable absorber and the laser emission time can be obtained by monitoring the change of the transmittance of the saturable absorber according to the characteristics of the saturable absorber, that is, the saturable absorber is transparent to the laser when reaching a saturation value, and the laser passes through the saturable absorber and then is output through the output mirror. When the applicant obtains a set value of the transmissivity of the saturable absorber through experiments, the set value is the light emitting time when the population inversion approaches to the light emitting threshold and the laser pulse is emitted quickly.
The transmissivity of the laser crystal can be monitored, the laser crystal is one of gain media, and the laser crystal is a precondition for generating laser when the population inversion is achieved. Therefore, the applicant of the present application confirms the state of the population of the laser crystal based on the characteristics thereof, and since it has a certain correlation with the transmittance thereof, it can monitor the state by the transmittance thereof. When the applicant obtains a set value of the laser crystal transmissivity through experiments, the set value is the light emitting time when the population inversion approaches to the light emitting threshold and the laser pulse is rapidly emitted.
The pump light is irradiated onto the laser crystal to generate irradiation light in a population inversion state. Most of the pump light is absorbed by the laser crystal after being irradiated to the laser crystal, and the residual pump light which is not absorbed penetrates through the laser crystal. Therefore, the applicant thinks that the residual pump light is monitored, the absorption condition of the laser crystal to the pump light can be known, and the state of the population inversion of the gain medium can be reflected laterally. And it is confirmed through experiments that the timing corresponding to the set value of the transmittance of the pump light at the laser crystal is the pulse emission preparation timing of the laser.
The laser pulse emission preparation time of the laser is monitored by comparison with detection after laser emission or by the design of the laser power supply controller. Delays due to detection after laser emission and delays and errors due to transmission of the laser power controller can be avoided. The detection device is arranged in the laser cavity, the preparation time of laser emission is detected in the laser generation process, the sum of the preparation time and the preset preparation time is the emission time of laser pulses, the active measurement signal is obtained, the obtained zero point signal of the laser is accurate and advanced, and the laser device is particularly suitable for occasions needing to know the light emission of the laser in advance, and is smaller in error and more accurate.
Drawings
Fig. 1 is a schematic structural diagram of a laser according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an apparatus for predicting a laser pulse emission preparation time according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an apparatus for predicting a laser pulse emission preparation time according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an apparatus for predicting a laser pulse emission preparation time according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating steps of a method for predicting a laser pulse firing preparation time according to an embodiment of the present disclosure;
fig. 6 is a graph of transmittance versus time provided by an embodiment of the present application.
Reference numerals: 1. a pump source; 11. a laser resonant cavity; 12. an input mirror; 13. a coupling output mirror; 14. a laser crystal; 15. a saturable absorber; 21. a first laser diode; 22. a second laser diode; 31. a first photodiode; 32. a second photodiode; 33. a third photodiode.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
To solve the technical problems in the background art, embodiments of the present invention provide an apparatus for predicting a laser pulse emission preparation time. Referring to fig. 1, which is a schematic structural diagram of a laser in the present application, the laser includes a laser resonator 11, a laser crystal 14, and a saturable absorber 15, the laser crystal 14 and the saturable absorber 15 are coaxially disposed in the laser resonator 11, the laser resonator 11 is composed of an input mirror 12 and a coupling output mirror 13, the input mirror 12 and the coupling output mirror 13 are sequentially disposed along an output beam direction, and an output beam passes through the laser crystal 14 and the saturable absorber 15. A pump source 1 is also included, the pump source 1 being configured to emit pump light into a laser crystal 14 in the laser cavity 11. Specifically, the order of arrangement of the laser crystal 14 and the saturable absorber 15 is not limited. As shown in fig. 1, the input mirror 12, the laser crystal 14, the saturable absorber 15, and the coupling-out mirror 13 are arranged in this order in the output beam direction. In other embodiments, the input mirror 12, the saturable absorber 15, the laser crystal 14 and the coupling-out mirror 13 may be arranged in the output beam direction in this order.
The device comprises a light-emitting element and a light-receiving element, wherein the light-emitting element and the light-receiving element are both arranged in the laser resonant cavity 11. The light emitting element is used to emit light to the laser crystal 14 and/or said saturable absorber 15. The first light receiving element is used for receiving the transmission light emitted by the light emitting element and passing through the laser crystal 14 and/or the saturable absorber 15, and converting the received transmission light signal into an electric signal. Specifically, the light emitting element may be a laser diode, and the light receiving element may be a photodiode or a photocoupler.
And the calculating unit is connected with the light detection unit and is used for controlling the light emitting element to emit light, acquiring the electric signal from the first light receiving element, obtaining the transmissivity of the laser crystal 14 and/or the saturable absorber 15 according to the electric signal, detecting the time corresponding to the set value of the transmissivity and determining the time as the pulse emission preparation time of the laser.
The time at which the transmittance reaches a maximum value during the pulse emission of the laser, that is, the time closest to the pulse emission of the laser, is determined by the test of the inventors. Thus, the set value may be a maximum value, i.e. the pulse emission preparation time, i.e. the time closest to the emission of the laser pulse, or a specific value or range of values smaller than the maximum value, for the sake of measurement, and the set value may correspond to the pulse emission preparation time, i.e. the time before the pulse emission time of the laser during which the transmittance gradually increases, which is a time difference from the emission time of the pulse. In practical applications, since the transmittance becomes smaller after the transmittance becomes larger, the time at which the previous time point reaches the set value needs to be selected as the pulse emission preparation time point.
Before measurement, the transmissivity of the laser from the time of preparing to emit pulses to the pulse emission time is measured in advance to obtain the maximum value of the transmissivity, and the time of reaching each set value before the maximum value is measured, so that the time difference between the time when the transmissivity reaches each set value and the time when the transmissivity reaches the maximum value can be obtained.
Therefore, the selection of the set value of the transmissivity can be customized according to actual requirements. The principle of choice is that it must be larger than the background noise of the detector, and a value is chosen within the range of the background noise and the transmission extrema of this detector. The value selected is determined according to the actually required preparation time. If it is desired to predict the laser pulse emission as early as possible, the intensity value is chosen as close as possible to the background noise of the detector, for example twice the background noise value. An extreme value close to the transmittance may also be selected as the predicted value.
The laser generates laser light by emitting pump light output by the pump source 1 onto the laser crystal 14, and the laser light is generated by the laser crystal 14. The laser crystal 14 is one of gain media, which refers to a system of substances used to achieve population inversion and stimulated radiation amplification that produces light. Since the gain medium is premised on the generation of laser light when the population inversion is achieved, the population state of the gain medium is in a certain relationship with the transmittance thereof.
The transmittance of the saturable absorber 15 reflects the degree of transparency of the saturable absorber 15, and the absorption coefficient of the saturable absorber 15 for the pump light output by the pump source 1 decreases as the incident light intensity increases. The applicant of the present application, based on the characteristics of the saturable absorber 15, confirms that it is possible to obtain the relationship between the transmission rate of the saturable absorber 15 and the emission timing of the laser, that is, the laser is transparent when reaching the saturation value, and the laser passes through the saturable absorber 15 and then is output through the output mirror. When the transmittance of the saturable absorber 15 reaches the maximum value, that is, when the population inversion approaches the light extraction threshold, the light extraction time is the light extraction time when the laser pulse is rapidly emitted. Preferably, the time at which the maximum transmittance of the saturable absorber is at is the light extraction time at which the laser pulse is emitted quickly.
The pump light output by the pump source 1 in the laser enters the laser resonator 11 formed by the input mirror 12 and the coupling output mirror 13, enters the laser crystal 14, is emitted from the laser crystal 14, then is transmitted to the coupling output mirror 13 after passing through the saturable absorber 15, and is output by the coupling output mirror 13. Meanwhile, the light emitting element disposed in the laser resonator 11 emits light, the light receiving element receives the transmitted light of the laser crystal 14 and/or the saturable absorber 15 and converts it into an electrical signal, and the computing unit acquires the electrical signal and performs computation and prediction based on the characteristics of the saturable absorber 15 or the laser crystal 14.
Referring to fig. 2, in one embodiment, the light emitting device of the apparatus includes a first laser diode 21, the light receiving device includes a first photodiode 31, and the first laser diode 21 and the first photodiode 31 are respectively connected to the computing unit. The first laser diode 21 and the first photodiode 31 are symmetrically disposed on both sides of the saturable absorber 15. The first laser diode 21 is configured to emit first detection laser light to the saturable absorber 15, and the first photodiode 31 is configured to receive first transmission light of the first detection laser light passing through the saturable absorber 15 and convert the first transmission light signal into a first electrical signal.
The calculation unit is used for controlling the first laser diode 21 to emit laser, acquiring a first electric signal from the first photodiode 31, obtaining the transmittance of the saturable absorber 15 according to the first electric signal, detecting the time corresponding to the preset transmittance value of the saturable absorber 15, and determining the time as the pulse emission preparation time of the laser.
In order to determine the pulse emission preparation timing, it can be judged by obtaining the transmittance of the saturable absorber 15. Thus, an additional light source may be used for detection. That is, by providing the first laser diode 21 on one side of the saturable absorber 15, the first laser diode 21 emits laser light and transmits the laser light onto the saturable absorber 15, and the first photodiode 31 receives the transmitted light. The first photodiode 31 converts the received transmitted light signal into a first electrical signal. The calculation unit calculates the change of the transmissivity of the saturable absorber with time according to the first electric signal. When the transmittance of the saturable absorber 15 is at the maximum, the population inversion approaches the light emission threshold, and at this time, the light emission timing is the light emission timing at which the laser pulse is rapidly emitted. Preferably, the time at which the maximum transmittance of the laser crystal is present may be selected as the preparation time for the emission of the laser pulse.
Referring to fig. 3, in another embodiment, the light emitting device includes a second laser diode 22, the light receiving device includes a second photodiode 32, and the second laser diode 22 and the second photodiode 32 are respectively connected to the computing unit. The second laser diode 22 and the second photodiode 32 are symmetrically disposed on both sides of the laser crystal 14.
The second laser diode 22 is used for emitting second detection laser light to the laser crystal 14, and the second photodiode 32 is used for receiving second transmission light of the second detection laser light passing through the laser crystal 14 and converting the second transmission light signal into a second electric signal.
The calculating unit is used for controlling the second laser diode 22, acquiring a second electric signal from the second photodiode 32, obtaining the transmittance of the laser crystal 14 according to the second electric signal, detecting the time corresponding to the preset value of the transmittance preset by the laser crystal 14, and determining the time as the pulse emission preparation time of the laser.
The pump light output by the pump source 1 enters the laser resonator 11 formed by the input mirror 12 and the coupling output mirror 13, enters the laser crystal 14, is emitted from the laser crystal 14, then passes through the saturable absorber 15, then is emitted to the coupling output mirror 13, and the coupling output mirror 13 outputs pulse laser. At the same time, the second laser diode 22 disposed on one side of the laser crystal 14 emits laser light to be transmitted onto the laser crystal 14, and the second photodiode 32 disposed on the other side of the laser crystal 14 receives the transmitted light.
The laser crystal 14 is one type of gain medium, and the achievement of population inversion by the laser crystal 14 is a prerequisite for lasing. Therefore, the applicant of the present application confirms the state of the population of the laser crystal based on the characteristics thereof, and since it has a certain correlation with the transmittance thereof, it can monitor the state by the transmittance thereof. The applicant obtains the maximum laser crystal transmittance through experiments, namely the time when the population inversion approaches the light emitting threshold value and is the light emitting time when the laser pulse is emitted quickly. The transmissivity of the laser crystal 14 may also be detected using an additional light source. That is, laser light is emitted at one side of the laser crystal 14 by the second laser diode 22 and transmitted onto the laser crystal 14, and the transmitted light is received by the second photodiode 32. The second photodiode 32 converts the received transmitted light signal into a second electrical signal. The calculation unit calculates the change of the transmittance of the laser crystal 14 with time. Preferably, the time at which the maximum transmittance of the laser crystal 14 occurs is selected to be the light extraction time at which the laser pulses are emitted quickly.
In view of the technical problems in the background art, the embodiments of the present invention further provide an apparatus for predicting a laser pulse emission preparation time. Referring to fig. 1, which is a schematic structural diagram of a laser in the present application, the laser includes a pump source 1, a laser resonator 11, a laser crystal 14 and a saturable absorber 15, the laser crystal 14 and the saturable absorber 15 are coaxially disposed in the laser resonator 11, and the laser resonator 11 is composed of an input mirror 12 and a coupling output mirror 13. The input mirror 12 and the coupling-out mirror 13 are arranged in sequence in the direction of the output beam of the pump source 1, the output beam of the pump source 1 passing through the laser crystal 13 and the saturable absorber 14. Specifically, the order of arrangement of the laser crystal 14 and the saturable absorber 15 is not limited. As shown in fig. 1, the input mirror 12, the laser crystal 14, the saturable absorber 15, and the coupling-out mirror 13 are arranged in this order in the direction of the output beam of the pump source 1. In other embodiments, the input mirror 12, the saturable absorber 15, the laser crystal 14 and the coupling-out mirror 13 may be arranged in sequence along the output beam direction of the pump source 1.
The pump source 1 is used to emit pump light to the laser crystal 14 in the laser cavity 11.
The device comprises a second light receiving element which is arranged in the laser resonant cavity 11 and used for receiving the transmission light of the pump light emitted by the pump source 1 in the laser crystal 14 and converting the transmission light signal into an electric signal. Specifically, the second light receiving element may be a photodiode or a photocoupler. Since the laser crystal 14 passes light sideways, the second light receiving element is not limited to an angle at which the transmitted light is received. Preferably, the second light receiving element can receive the transmission light of the pump light in the laser crystal 14 in the vertical direction, and can also receive the transmission light of the pump light in the laser crystal 14 in the 45 ° angle direction of the side face.
The laser device further comprises a calculating unit which is connected with the second light receiving element and used for acquiring the electric signal from the first light receiving element, obtaining the transmissivity of the laser crystal 14 and/or the saturable absorber 15 according to the electric signal, detecting the time corresponding to the preset transmissivity and determining the time as the pulse emission preparation time of the laser.
The time when the transmittance reaches a minimum value during the pulse emission of the laser, that is, the time when the pulse emission of the laser is closest to the pulse emission time of the laser, is determined by experiments of the inventors. Thus, the set value may be a minimum value, i.e. the pulse emission preparation time, i.e. the time closest to the emission of the laser pulse, or a specific value or range of values greater than the minimum value, for ease of measurement, and the set value may correspond to the pulse emission preparation time, i.e. the time before the pulse emission time of the laser during which the transmittance gradually increases, which is a time difference from the emission time of the pulse. In practical applications, since the transmittance is increased after being decreased, the time at which the transmittance reaches the set value before the screening is required to be the pulse emission preparation time.
Before measurement, the transmissivity of the laser from the time of preparing to emit pulses to the pulse emission time is measured in advance to obtain the minimum value of the transmissivity and the time of reaching each set value before the minimum value, so that the time difference between the time when the transmissivity reaches each set value and the time when the transmissivity reaches the minimum value can be obtained.
The pump light is irradiated onto the laser crystal 14, and irradiation light in a population inversion state is generated. Most of the pump light that strikes the laser crystal 14 is absorbed by the laser crystal 14, and the remaining unabsorbed light passes through the laser crystal 14. Therefore, the applicant thinks that the residual pump light is monitored, the absorption condition of the laser crystal to the pump light can be known, and the state of the population inversion of the gain medium can be reflected laterally. And it is confirmed through experiments that the timing corresponding to the set value of the transmittance of the pump light at the laser crystal is the pulse emission preparation timing of the laser. Preferably, the time at which the minimum transmittance of the laser crystal is present may be selected as the preparation time for laser pulse emission.
Referring to fig. 4, in an embodiment, the second light receiving unit of the apparatus includes a third photodiode 33, the third photodiode 33 is connected to the computing unit, and the third photodiode 33 is disposed on a side of the laser crystal 14.
The third photodiode 33 is configured to receive third transmitted light of the pump light emitted by the pump source 1 in the laser crystal 14, and convert the third transmitted light signal into a third electrical signal.
The calculating unit is configured to obtain the third electrical signal from a third photodiode, obtain the transmittance of the laser crystal 14 according to the third electrical signal, detect a time corresponding to a preset value of the transmittance of the laser crystal 14, and determine the time as a pulse emission preparation time of the laser.
The pump light output by the pump source 1 enters the laser resonant cavity 11 formed by the input mirror 12 and the coupling output mirror 13 after passing through the pump optical coupling device, enters the laser crystal 14, is emitted from the laser crystal 14, then is emitted to the coupling output mirror 13 after passing through the saturable absorber 15, and is output as pulse laser by the coupling output mirror 13. At the same time, the third photodiode 33 disposed on the other side of the laser crystal 14 receives the pump light transmitted through the laser crystal 14.
The third photodiode 33 disposed on the side of the laser crystal 14 receives the pump light transmitted in the laser crystal 14, i.e., the remaining pump light. The third photodiode 33 converts the received transmitted light into a third electric signal, and calculates a change in transmittance of the laser crystal 14 with time. When the transmittance of the laser crystal 14 of the pump light approaches the set value, the population inversion approaches the set value, which is the light output timing at which the laser pulse is emitted quickly.
Specifically, the memory of the computing unit is an article of manufacture that can implement information storage by any method or technique, including but not limited to: phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that may be used to store information that may be accessed by a processor.
The processor of the computing unit is a processor capable of performing computing functions, including but not limited to: one or a combination of any more of FPGA, MCU, MPU, DPU, CPU, ASIC, etc.; or may be a terminal device including one or any of the above processors.
As shown in fig. 5, an embodiment of the present application further provides a method for predicting a laser pulse emission preparation time, where the method is implemented by a computing unit in any of the above embodiments, where a laser includes a laser resonator, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonator, the laser resonator is composed of an input mirror and a coupling-out mirror, the input mirror and the coupling-out mirror are sequentially disposed along an output beam direction, and the output beam passes through the laser crystal and the saturable absorber, where the apparatus includes a computing unit, and specifically includes the following steps:
s51: a light emitting element and a first light receiving element are disposed within the laser resonator.
S52: controlling the light emitting element to emit light to the laser crystal and/or the saturable absorber.
S53: and acquiring an electric signal from the first light receiving element, wherein the electric signal is obtained by receiving the transmission light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber through the first light receiving element and converting the received transmission light signal.
S54: and obtaining the transmissivity of the laser crystal and/or the saturable absorber according to the electric signal.
S55: and detecting the moment corresponding to the preset set value of the transmissivity, and determining the moment as the pulse emission preparation moment of the laser.
The method detects and obtains the transmitted light of the laser crystal or the saturable absorber through the light-emitting element and the light-receiving element which are arranged in the laser resonant cavity, and converts the transmitted light signal into an electric signal. The calculating unit obtains the electric signal, and determines the transmittance and the time corresponding to the light-emitting threshold of the population inversion according to the relationship between the transmittance of the laser crystal or the saturable absorber and the population inversion, thereby determining the pulse emission preparation time of the laser.
In a specific example, the light emitting element includes a first laser diode, the first laser diode is connected to the computing unit, the first light receiving element includes a first photodiode, and the first photodiode is connected to the computing unit; the first laser diode and the first photodiode are symmetrically arranged on two sides of the saturable absorber, and the method comprises the following steps:
controlling the first laser diode to emit first detection laser light to the saturable absorber;
acquiring an electrical signal from the first light receiving element, wherein the electrical signal is obtained by receiving the transmitted light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber through the first light receiving element and converting the received transmitted light signal;
obtaining the transmissivity of the saturable absorber according to the first electric signal;
and detecting the time corresponding to the preset transmissivity set value of the saturable absorber, and determining the time as the pulse emission preparation time of the laser.
By providing the first laser diode on one side of the saturable absorber, the first laser diode emits laser light and transmits the laser light onto the saturable absorber, and the first photodiode receives the transmitted light. The first photodiode converts the received transmitted light signal into a first electrical signal. The calculation unit calculates the change of the transmissivity of the saturable absorber with time according to the first electric signal. The set value of the transmittance of the saturable absorber is the time when the transmittance is maximum. At this time, the population inversion approaches the light emission threshold, and prepares for the pulse emission of the laser.
In a specific embodiment, the light emitting element comprises a second laser diode, the second laser diode being connected to the computing unit, the first light receiving element comprises a second photodiode, the second photodiode being connected to the computing unit; the second laser diode and the second photodiode are symmetrically arranged on two sides of the laser crystal, and the method comprises the following steps:
controlling the second laser diode to emit second detection laser to the laser crystal;
acquiring a second electric signal from the second photodiode, wherein the second electric signal is obtained by receiving second transmission light which is emitted by the second laser diode and passes through the laser crystal through the second photodiode and converting the received second transmission light signal;
obtaining the transmissivity of the laser crystal according to the second electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
Laser light is emitted at one side of the laser crystal by the second laser diode and transmitted onto the laser crystal, and the transmitted light is received by the second photodiode. The second photodiode converts the received transmitted light signal into a second electrical signal. The calculating unit calculates the change of the transmissivity of the laser crystal along with the time. The set value of the transmittance of the laser crystal is the time when the transmittance approaches the set value. At this time, the population inversion approaches the light emission threshold, and prepares for the pulse emission of the laser.
The application also provides a method for predicting the preparation time of laser pulse emission, and the laser comprises a pumping source, a laser resonant cavity, a laser crystal and a saturable absorber, wherein the laser crystal and the saturable absorber are coaxially arranged in the laser resonant cavity, the laser resonant cavity consists of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially arranged along the direction of an output beam of the pumping source, the output beam of the pumping source passes through the laser crystal and the saturable absorber, and a device for predicting the preparation time of laser pulse emission comprises a computing unit, and the method comprises the following steps:
a second light receiving element is disposed within the laser resonator.
And acquiring an electric signal from the second light receiving element, wherein the electric signal is obtained by receiving the transmission light of the pump light emitted by the pump source and passing through the laser crystal through the second light receiving element and converting the transmission light signal.
And obtaining the transmissivity of the laser crystal according to the electric signal.
And detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
The transmitted light of the pump light in the laser crystal, i.e. the remaining pump light, is received by a second light receiving element arranged on one side of the laser crystal. And the second light receiving element converts the received transmitted light into a third electric signal, and the change of the transmissivity of the laser crystal along with time is calculated. When the transmissivity of the laser crystal of the pump light is close to a set value, the population inversion is close to the set value at the moment, and the pumping light is the light-emitting time of the fast emission of the laser pulse.
In a specific embodiment, the second light receiving element includes a third photodiode, the third photodiode is disposed on a side of the laser crystal and connected to the computing unit, the method includes the steps of:
acquiring a third electric signal from the second light receiving element, wherein the third electric signal receives third transmission light of the pump light emitted by the pump source in the laser crystal through the third photodiode, and the third transmission light signal is converted;
obtaining the transmissivity of the laser crystal according to the third electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
The third photodiode arranged on one side of the laser crystal receives the transmitted light of the pump light in the laser crystal, namely the residual pump light. And the third photodiode converts the received transmitted light into a third electric signal, and the change of the transmissivity of the laser crystal along with time is calculated. When the transmissivity of the laser crystal of the pump light is close to a set value, the population inversion is close to the set value at the moment, and the pumping light is the light-emitting time of the fast emission of the laser pulse.
Please refer to fig. 6, which is a schematic diagram of a theoretical simulation result of the apparatus corresponding to the above method applied to the laser. The passive q-switched laser with the wavelength of 1645nm has the laser cavity length of 570mm, the cavity loss is assumed to be 8%, the output mirror reflectivity is 90%, the used saturable absorber is Co2+: MgAl2O4, the thickness is 1.5mm, and the laser gain medium is Er: YAG, crystal length 50 mm. And (4) carrying out numerical solution according to a rate equation to calculate a saturable absorber population inversion curve to obtain a curve shown in figure 6.
Wherein, the left ordinate is the photon number density, the right ordinate is the transmissivity of the saturable absorber, the abscissa is the time axis, the curve 1 is the laser pulse curve, and the curve 2 is the particle number inversion curve of the saturable absorber. The time at which the transmissivity of the saturable absorber reached 98% was approximately 6.5 mus, at which time the laser pulse photon count density was slightly greater than zero, the laser pulse was about to be emitted, and it was seen from the simulation that the laser pulse was emitted at approximately 8 mus. Monitoring the transmittance of the saturable absorber can predict the laser pulse emission preparation time ahead by about 2 mus.
According to the device and the method for preparing the laser pulse emission time, the light-emitting element, the first light receiving element and the second light receiving element are arranged in the laser cavity, the relation between the transmittance and the population inversion is obtained through the first light receiving element and the second light receiving element respectively, so that the time of the transmittance when the population inversion is close to the maximum is determined in the laser generation process, the light emitting time of the laser pulse fast emission is predicted, and the time is recorded as the preparation time.
Specifically, by monitoring the transmittance of the saturable absorber, the absorption coefficient of the saturable absorber to the pump light output by the pump source decreases with the increase of the incident light intensity, and the applicant of the present application confirms that the relation between the transmission coefficient of the saturable absorber and the laser emission time can be obtained by monitoring the change of the transmittance of the saturable absorber according to the characteristics of the saturable absorber, that is, the saturable absorber is transparent to the laser when reaching a saturation value, and the laser passes through the saturable absorber and then is output through the output mirror. When the applicant obtains a set value of the transmissivity of the saturable absorber through experiments, the set value is the light emitting time when the population inversion approaches to the light emitting threshold and the laser pulse is emitted quickly.
The transmissivity of the laser crystal can be monitored, the laser crystal is one of gain media, and the laser crystal is a precondition for generating laser when the population inversion is achieved. Therefore, the applicant of the present application confirms the state of the population of the laser crystal based on the characteristics thereof, and since it has a certain correlation with the transmittance thereof, it can monitor the state by the transmittance thereof. When the applicant obtains a set value of the laser crystal transmissivity through experiments, the set value is the light emitting time when the population inversion approaches to the light emitting threshold and the laser pulse is rapidly emitted.
The pump light is irradiated onto the laser crystal to generate irradiation light in a population inversion state. Most of the pump light is absorbed by the laser crystal after being irradiated to the laser crystal, and the residual pump light which is not absorbed penetrates through the laser crystal. Therefore, the applicant thinks that the residual pump light is monitored, the absorption condition of the laser crystal to the pump light can be known, and the state of the population inversion of the gain medium can be reflected laterally. And it is confirmed through experiments that the timing corresponding to the set value of the transmittance of the pump light at the laser crystal is the pulse emission preparation timing of the laser.
Compared with detection after laser emission, or monitoring laser pulse emission of the laser through the design of the laser power controller, delay caused by detection after laser emission and delay and error caused by transmission of the laser power controller can be avoided. The detection device is arranged in the laser cavity, and the preparation time of laser emission is detected in the process of generating laser, so that the emission time of laser pulse is accurately known, the active measurement signal is obtained, the obtained zero signal of the laser is accurate and advanced, and the laser device is particularly suitable for occasions needing to predict the light emission of the laser, and has smaller error and more accuracy.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. An apparatus for predicting a preparation time of pulse emission of a laser, wherein the laser includes a laser resonator, a laser crystal, and a saturable absorber, the laser crystal and the saturable absorber are coaxially disposed in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially disposed along an output beam direction, and the output beam passes through the laser crystal and the saturable absorber, the apparatus comprising:
a light emitting element disposed within the laser resonator, the light emitting element configured to emit light towards the laser crystal and/or the saturable absorber;
the first light receiving element is arranged in the laser resonant cavity and used for receiving the transmitted light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber and converting the received transmitted light signal into an electric signal;
and the calculation unit is connected with the light emitting element and the first light receiving element, and is used for controlling the light emitting element to emit light, acquiring the electric signal from the first light receiving element, obtaining the transmissivity of the laser crystal and/or the saturable absorber according to the electric signal, detecting the preset moment corresponding to the set value of the transmissivity, and determining the moment as the pulse emission preparation moment of the laser.
2. The apparatus of claim 1, wherein the means for predicting the laser pulse firing preparation time is further configured to:
the light-emitting element comprises a first laser diode, and the first laser diode is connected with the computing unit;
the first light receiving element includes a first photodiode connected to the calculation unit;
the first laser diode and the first photodiode are symmetrically arranged on two sides of the saturable absorber;
the first laser diode is used for emitting first detection laser to the saturable absorber, and the first photodiode is used for receiving first transmission light of the first detection laser passing through the saturable absorber and converting the first transmission light signal into a first electric signal;
the calculation unit is used for controlling the first laser diode to emit laser, acquiring the first electric signal from the first photodiode, obtaining the transmissivity of the saturable absorber according to the first electric signal, detecting a moment corresponding to a preset value of the transmissivity of the saturable absorber, and determining the moment as a pulse emission preparation moment of the laser.
3. The apparatus of claim 1, wherein the means for predicting the laser pulse firing preparation time is further configured to:
the light-emitting element comprises a second laser diode, and the second laser diode is connected with the computing unit;
the first light receiving element includes a second photodiode connected to the calculation unit;
the second laser diode and the second photodiode are symmetrically arranged on two sides of the laser crystal;
the second laser diode is used for emitting second detection laser to the laser crystal, and the second photodiode is used for receiving second transmission light of the second detection laser passing through the laser crystal and converting a second transmission light signal into a second electric signal;
the calculation unit is used for controlling the second laser diode to emit laser, acquiring the second electric signal from the second photodiode, obtaining the transmissivity of the laser crystal according to the second electric signal, detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
4. An apparatus for predicting a laser pulse emission preparation time, wherein the laser comprises a pump source, a laser resonator, a laser crystal and a saturable absorber, the laser crystal and the saturable absorber are coaxially arranged in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially arranged along an output beam direction of the pump source, and an output beam of the pump source passes through the laser crystal and the saturable absorber, the apparatus comprising:
the second light receiving element is arranged in the laser resonant cavity and used for receiving the transmission light of the pump light emitted by the pump source in the laser crystal and converting the transmission light signal into an electric signal;
and the calculating unit is connected with the second light receiving element and used for acquiring the electric signal from the second light receiving element, obtaining the transmissivity of the laser crystal according to the electric signal, detecting the time corresponding to the preset transmissivity set value and determining the time as the pulse emission preparation time of the laser.
5. The apparatus according to claim 4, wherein said means for predicting a laser pulse firing preparation time is further configured to:
the second light receiving element comprises a third photodiode, and the third photodiode is arranged on one side surface of the laser crystal and connected with the computing unit;
the third photodiode is used for receiving third transmission light of the pump light emitted by the pump source in the laser crystal and converting a third transmission light signal into a third electric signal;
the calculation unit is configured to obtain the third electrical signal from the third photodiode, obtain the transmittance of the laser crystal according to the third electrical signal, detect a time corresponding to a preset value of the transmittance of the laser crystal, and determine the time as a pulse emission preparation time of the laser.
6. A method for predicting a preparation time of laser pulse emission, wherein the laser comprises a laser resonator, a laser crystal and a saturable absorber, the laser crystal and the saturable absorber are coaxially arranged in the laser resonator, the laser resonator is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially arranged along an output beam direction, and the output beam passes through the laser crystal and the saturable absorber, and the method comprises the following steps:
a light emitting element and a first light receiving element are arranged in the laser resonant cavity;
controlling the light emitting element to emit light to the laser crystal and/or the saturable absorber;
acquiring an electrical signal from the first light receiving element, wherein the electrical signal is obtained by receiving the transmitted light emitted by the light emitting element and passing through the laser crystal and/or the saturable absorber through the first light receiving element and converting the received transmitted light signal; obtaining the transmissivity of the laser crystal and/or the saturable absorber according to the electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity, and determining the moment as the pulse emission preparation moment of the laser.
7. The method according to claim 6, wherein the light emitting element comprises a first laser diode, the first laser diode is connected to the computing unit, the first light receiving element comprises a first photodiode, and the first photodiode is connected to the computing unit; the first laser diode and the first photodiode are symmetrically arranged on two sides of the saturable absorber, and the method comprises the following steps:
controlling the first laser diode to emit first detection laser light to the saturable absorber;
acquiring a first electric signal from the first photodiode, wherein the first electric signal is obtained by receiving first transmitted light which is emitted by the first laser diode and passes through the saturable absorber through the first photodiode, and converting the received first transmitted light signal;
obtaining the transmissivity of the saturable absorber according to the first electric signal;
and detecting the time corresponding to the preset transmissivity set value of the saturable absorber, and determining the time as the pulse emission preparation time of the laser.
8. The method according to claim 6, wherein the light emitting element comprises a second laser diode, the second laser diode is connected to the computing unit, the first light receiving element comprises a second photodiode, and the second photodiode is connected to the computing unit; the second laser diode and the second photodiode are symmetrically arranged on two sides of the laser crystal, and the method comprises the following steps:
controlling the second laser diode to emit second detection laser to the laser crystal;
acquiring a second electric signal from the second photodiode, wherein the second electric signal is obtained by receiving second transmission light which is emitted by the second laser diode and passes through the laser crystal through the second photodiode and converting the received second transmission light signal;
obtaining the transmissivity of the laser crystal according to the second electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
9. A method for predicting the preparation time of laser pulse emission, wherein the laser comprises a pump source, a laser resonant cavity, a laser crystal and a saturable absorber, the laser crystal and the saturable absorber are coaxially arranged in the laser resonant cavity, the laser resonant cavity is composed of an input mirror and a coupling output mirror, the input mirror and the coupling output mirror are sequentially arranged along the direction of an output beam of the pump source, the output beam of the pump source passes through the laser crystal and the saturable absorber, and the device for predicting the preparation time of laser pulse emission comprises a calculation unit, and the method comprises the following steps:
a second light receiving element is arranged in the laser resonant cavity;
acquiring an electrical signal from the second light receiving element, wherein the electrical signal is obtained by receiving the transmission light of the pump light emitted by the pump source and passing through the laser crystal through the second light receiving element and converting the transmission light signal;
obtaining the transmissivity of the laser crystal according to the electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
10. The method of claim 9, wherein the second light receiving element comprises a third photodiode, the third photodiode being disposed on a side of the laser crystal and connected to the computing unit, the method comprising:
acquiring a third electric signal from the third photodiode, wherein the third electric signal receives third transmission light of the pump light emitted by the pump source in the laser crystal through the third photodiode, and the third transmission light signal is converted to obtain the third electric signal;
obtaining the transmissivity of the laser crystal according to the third electric signal;
and detecting the moment corresponding to the preset set value of the transmissivity of the laser crystal, and determining the moment as the pulse emission preparation moment of the laser.
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| US5926495A (en) * | 1997-08-04 | 1999-07-20 | Litton Systems, Inc. | Laser diode pump wavelength sensing and control apparatus and method |
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