CN113659422A - Time-sequence programmable composite laser pulse control system and control method - Google Patents
Time-sequence programmable composite laser pulse control system and control method Download PDFInfo
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- CN113659422A CN113659422A CN202110981067.8A CN202110981067A CN113659422A CN 113659422 A CN113659422 A CN 113659422A CN 202110981067 A CN202110981067 A CN 202110981067A CN 113659422 A CN113659422 A CN 113659422A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2375—Hybrid lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device
Abstract
The invention discloses a time sequence programmable composite laser pulse control system and a control method, wherein the system comprises a first laser, a second laser, a first acousto-optic module, a second acousto-optic module and a time sequence signal control unit, wherein the first laser and the second laser respectively emit a first laser and a second laser with incidence angles of Bragg angles to the first acousto-optic module and the second acousto-optic module; the first acousto-optic module enables the first laser to generate Bragg diffraction to form first diffraction light and second diffraction light, and the second diffraction light enters the second acousto-optic module at a Bragg angle; the second sound optical module enables the second laser light and the second diffraction light to generate Bragg diffraction, and third diffraction light and fourth diffraction light are formed, wherein one of the third diffraction light and the fourth diffraction light can be used as composite laser light; the time sequence signal control unit transmits electric signals to the first acousto-optic module and the second acousto-optic module to control the light intensity ratio of diffracted light of each acousto-optic module to incident light, so that the intensity and time sequence relation of two lasers in the composite laser are adjusted.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a time-sequence programmable composite laser pulse control system and a control method.
Background
Lasers can be divided into continuous lasers and pulsed lasers according to their temporal continuity. Continuous lasers have the advantage of stable output, multimode operation, high average power, but generally low peak power. The pulse laser has the advantages of higher peak power, better single-mode output light quality and limited single pulse energy. In some special application scenarios, such as laser welding and laser cutting, a single type of continuous or pulsed laser processing generally cannot meet the processing requirements, and the continuous laser and the pulsed laser need to be combined into a composite laser for use.
At present, the beam combination mode of the composite laser mainly comprises wavelength beam combination, polarization beam combination and the like, wherein the wavelength beam combination is mainly finished by adopting a grating device, lasers with different wavelengths are superposed after passing through the grating, the intensity of a beam after beam combination is improved, and the beam combination effect is good. However, the manufacturing process of the grating is complex, the damage threshold is low, the combined beam of the laser with high power cannot be borne, and the prepared grating has a determined grating constant, so that the method has strong selectivity on the wavelength and the beam quality of the laser. The polarization beam combination is a technical method for spatially combining two linearly polarized lights with orthogonal polarization directions through a polarization beam combination mirror, the scheme requires that the incident laser light is polarized light, and the manufacturing process of the polarization beam combination mirror with a high damage threshold is complex. On the other hand, in the conventional beam combining method, the beam combining devices are all passive optical elements, and only the combination of the incident laser energy can be realized, but the energy and the time sequence of the composite laser cannot be dynamically adjusted and controlled.
Disclosure of Invention
In view of the above drawbacks or needs for improvement in the prior art, the present invention provides a time-programmable composite laser pulse control system and method, which aims to achieve the composite of two incident lasers within a wide wavelength range without limiting the polarization state of the laser, and to flexibly adjust and control the intensity and time sequence relationship of the two lasers.
To achieve the above object, according to one aspect of the present invention, there is provided a time-programmable composite laser pulse control system, which is characterized by comprising a first laser, a second laser, a first acousto-optic module, a second acousto-optic module and a time-sequence signal control unit, wherein the time-sequence signal control unit controls the first laser, the second laser, the first acousto-optic module, the second acousto-optic module and the time-sequence signal control unit
The first laser is used for emitting a Bragg angle theta as an incident angle to the first acousto-optic moduleBThe first laser of (2);
the first acousto-optic module is used for generating an ultrasonic field to enable the first laser to generate Bragg diffraction to form first diffraction light and second diffraction light, and the second diffraction light forms a Bragg angle thetaBIncident to the second sound optical module;
the second laser is used for emitting an incident angle to the second acoustic optical module as a Bragg angle thetaBThe second laser and the second diffracted light are positioned on two sides of the optical normal of the second optical module;
a second sound optical module for generating an ultrasonic field to bragg-diffract a second laser beam and a second diffracted beam, respectively, to form a first sub-diffracted beam and a second sub-diffracted beam corresponding to the second laser beam, and a third sub-diffracted beam and a fourth sub-diffracted beam corresponding to the second diffracted beam, wherein the first sub-diffracted beam and the fourth sub-diffracted beam have the same propagation direction, and synthesize a third diffracted beam, and the second sub-diffracted beam and the third diffracted beam have the same propagation direction, and synthesize a fourth diffracted beam, and at least one of the third diffracted beam and the fourth diffracted beam is used as a composite laser beam;
and the time sequence signal control unit is used for transmitting electric signals to the first acousto-optic module and the second acousto-optic module so as to control the intensity of an ultrasonic field in each acousto-optic module and adjust the ratio of the light intensity of diffracted light to the light intensity of incident light.
Preferably, one of the first laser and the second laser is a continuous laser and the other is a pulsed laser.
Preferably, each acousto-optic module comprises a piezoelectric transducer and an acousto-optic interaction medium, the piezoelectric transducer converts an electric signal into an ultrasonic signal with corresponding frequency, the ultrasonic signal is transmitted into the acousto-optic interaction medium, an ultrasonic field with specific frequency is formed in the acousto-optic interaction medium, and the incident angle is a Bragg angle thetaBThe incident light and the ultrasonic field generate acousto-optic interaction to generate Bragg diffraction to form two beams of diffraction light, wherein the direction of one beam of diffraction light is the same as that of the incident light, and the included angle of the two beams of diffraction light is 2 thetaB。
Preferably, the material of the acousto-optic interaction medium is quartz crystal or quartz glass.
Preferably, the wavelengths of the laser light emitted by the first laser and the second laser are the same.
Preferably, the timing signal control unit transmits two driving electrical signals with independent timings to the first acousto-optic module and the second acousto-optic module respectively to independently control the ratio of the light intensity of the diffracted light to the incident light in each acousto-optic module.
Preferably, the driving electrical signal is a pulse signal.
Preferably, a first total reflection mirror, a second total reflection mirror and an absorber are further included, wherein,
the first total reflection mirror and the second total reflection mirror are used for reflecting the first diffracted light to an absorber;
the absorber absorbs the first diffracted light and the third diffracted light.
Preferably, a third total reflection mirror and a beam expander are further included, wherein,
the third full mirror is used for reflecting the fourth diffraction light to the beam expander;
and the beam expander is used for outputting composite laser after collimating the fourth diffracted light.
According to another aspect of the present invention, there is provided a composite laser pulse control method with programmable timing, comprising:
providing a time-programmable composite laser pulse control system as described in any of the above;
and adjusting the time sequence and the intensity of the electric signal emitted by the time sequence signal control unit to form composite laser with different time sequences and intensities.
In general, the technical scheme provided by the invention has the following beneficial effects:
(1) the scheme uses the acousto-optic module, generates an ultrasonic field inside the acousto-optic module, and controls incident light to form a Bragg angle thetaBIncident into the acousto-optic module, and has acousto-optic interaction with the ultrasonic field of the acousto-optic module to generate Bragg diffraction, so that two lasers with wavelengths in a wider bandwidth range can be excitedThe optical device performs beam combination, no specific requirement is made on the polarization state of incident laser, and the beam quality of output light cannot be reduced after beam combination;
(2) according to the scheme, the two acousto-optic modules are used, the first laser and the second laser pass through the two acousto-optic modules and then are finally synthesized into the third diffracted light and the fourth diffracted light, at least one of the third diffracted light and the fourth diffracted light can be used as the composite laser, the light intensity of the composite laser is synthesized by the first laser and the second laser according to a certain proportion, the proportion is related to the ratio of the diffracted light formed by each acousto-optic module to the light intensity of incident light, and the ratio of the diffracted light of each acousto-optic module to the intensity of the incident light can be adjusted by adjusting the intensity and the time sequence of an electric signal emitted by the time sequence signal control unit, so that the intensity and the time sequence of the first laser and the second laser in the composite laser are flexibly adjusted and controlled to synthesize the composite laser with required intensity and time sequence.
Drawings
FIG. 1 is a schematic diagram of a composite laser pulse control system with programmable timing in one embodiment of the present application;
FIG. 2 is a schematic diagram of an acousto-optic module according to an embodiment of the present invention for implementing acousto-optic deflection;
fig. 3 is a schematic diagram of adjusting and controlling a composite laser waveform according to a driving electrical signal in a composite laser pulse control method with programmable timing according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 shows a composite laser pulse control system with programmable timing according to an embodiment of the present invention, which includes a first laser, a second laser, a first acousto-optic module, a second acousto-optic module, and a timing signal control unit. The first laser is used for emitting first laser B1, and the second laser is used for emitting second laser B4. In one embodiment, one of the first laser and the second laser is a continuous laser and the other is a pulsed laser.
The first laser is used for emitting a Bragg angle theta as an incident angle to the first acousto-optic moduleBFirst laser light B1.
The first acousto-optic module is used for generating an ultrasonic field to enable the first laser B1 to generate Bragg diffraction to form a first diffraction light B2 and a second diffraction light B3, and the second diffraction light B3 is at a Bragg angle thetaBIncident to the second sound optical module.
The second laser is used for emitting an incident angle to the second acoustic optical module as a Bragg angle thetaBThe second laser light B4 and the second laser light B4 and the second diffracted light B3 are located on both sides of the optical normal of the second optical module, that is, the second laser light B4 and the second diffracted light B3 are located on the same plane as the optical normal, and the second laser light B4 and the second diffracted light B3 are located on both sides of the optical normal and both form bragg angles θB。
The second sound optical module is configured to generate an ultrasonic field to bragg-diffract the second laser light B4 and the second diffracted light B3, respectively, wherein the second laser light B4 is diffracted to be divided into a first diffracted light beam and a second diffracted light beam, the second diffracted light beam B3 is diffracted to be divided into a third diffracted light beam and a fourth diffracted light beam, the first diffracted light beam and the fourth diffracted light beam are diffracted in the same direction, the third diffracted light beam B5 is synthesized, the second diffracted light beam and the third diffracted light beam B5 are synthesized in the same direction, the fourth diffracted light beam B6 is synthesized, and at least one of the third diffracted light beam B5 and the fourth diffracted light beam B6 is used as composite laser light.
And the time sequence signal control unit is used for transmitting electric signals to the first acousto-optic module and the second acousto-optic module to control the intensity of an ultrasonic field in each acousto-optic module, and then adjusting the ratio of the light intensity of diffracted light and incident light of each acousto-optic module, so that the time sequence and the intensity of the composite laser are adjusted.
In one embodiment, as shown in FIG. 2, each acousto-optic module includes a piezoelectric transducer and an acousto-optic interaction medium, and the timing signal is controlledThe radio frequency driving unit in the system unit provides an electric signal to the piezoelectric transducer, the piezoelectric transducer converts the electric signal into an ultrasonic signal with corresponding frequency, the ultrasonic signal is transmitted into the acousto-optic interaction medium, an ultrasonic field with specific frequency is formed in the acousto-optic interaction medium, and the incidence angle is a Bragg angle thetaBThe incident light and the ultrasonic field generate acousto-optic interaction to generate Bragg diffraction to form two beams of diffraction light, wherein the direction of one beam of diffraction light is the same as that of the incident light and is 0-order diffraction light, the other beam of diffraction light is positioned on the other side of the optical normal, namely the 0-order diffraction light deflects along the propagation direction of the ultrasonic field by twice the Bragg angle and is emitted as + 1-order diffraction light. Wherein, the size of the Bragg angle and the wavelength lambda of the incident light0Refractive index eta of acousto-optic medium and sound velocity upsilon of mediumsAnd ultrasonic frequency fsIn relation, the calculation formula is: sin thetaB＝λ0fs/(2ηυs). Neglecting the propagation loss of light, the incident light passing through the acousto-optic medium can be approximately considered as being completely divided into 0-order diffraction light and + 1-order diffraction light, i.e. the light intensity of the incident light is the sum of two beams of diffraction light, wherein the ratio of the light intensity of the + 1-order diffraction light to the light intensity of the incident light is defined as the diffraction efficiency etao，ηoThe voltage applied by the driving power supply is completely determined, and the voltage is increased along with the increase of the voltage, and the maximum voltage can reach 90%. Therefore, in the embodiment, the acousto-optic deflection method is used to change the optical path direction, wherein the damage threshold of the acousto-optic interaction medium in the acousto-optic deflection module is extremely high, and the acousto-optic deflection efficiency can reach 90%, so that efficient beam combination of high-power laser beams can be realized.
In one embodiment, the material of the acousto-optic interaction medium is quartz crystal or quartz glass, or other materials that can be used as ultrasonic field carriers.
In one embodiment, the wavelengths of the laser light emitted by the first laser and the second laser are the same, so as to realize the desired beam combination.
In one embodiment, as shown in fig. 1, the composite laser system further includes a first total reflection mirror, a second total reflection mirror and an absorber, wherein the first total reflection mirror and the second total reflection mirror are used for reflecting the first diffracted light B2 to the absorber, and the absorber is used for absorbing the first diffracted light B2 and the third diffracted light B5. In an embodiment, the composite laser system further includes a third total reflection mirror and a beam expander, the third total reflection mirror is configured to reflect the fourth diffracted light B6 to the beam expander, and the beam expander is configured to output the composite laser after collimating and focusing the fourth diffracted light B6. Furthermore, the area of the mirror surface of each total reflection mirror is larger than the area of the light spot of each corresponding incident light, so that the incident light is totally reflected.
In this embodiment, the first laser is a continuous laser and the second laser is a pulse laser, but in other embodiments, the first laser may be a pulse laser and the second laser may be a continuous laser.
In the present embodiment, as shown in fig. 1, the continuous laser and the pulse laser emit the first laser beam B1 and the second laser beam B4 at the same bragg angle θBWhen the first and second acousto-optic modules are both started, the first laser B1 emitted by the continuous laser is divided into two beams under the action of Bragg diffraction after passing through the first acousto-optic module, wherein the first diffracted light B2 (0-order diffracted light) is emitted in the same direction as the incident light, and is completely absorbed by the absorber after passing through the first holomirror and the second holomirror, and the second diffracted light B3(+ 1-order diffracted light) is 2 theta with the second diffracted light B2BEmitting at an included angle of thetaBB3 of the incident second acoustic optical module still satisfies Bragg condition and forms 2 theta with the second laser B4 of the pulse laserBAnd (4) an included angle. The second diffracted light B3 passes through the second optical module and is divided into two beams, the third diffracted light (0 th order diffracted light) is emitted in the direction of the second diffracted light B3, i.e. the direction of the B6 beam in the figure, and the fourth diffracted light (-1 st order diffracted light) is 2 theta with the third diffracted lightBAnd the angle is emergent, namely the direction B5 in the figure. The second laser beam B4 is also split into two beams by the second optical module, the first sub-diffracted beam (0 th-order diffracted beam) is emitted in the B4 direction, i.e., B5 direction in the figure, and the second sub-diffracted beam (+1 st-order diffracted beam) is emitted in the direction of 2 theta to the first sub-diffracted beamBAnd the angle is emergent, namely the direction B6 in the figure. The second diffracted light B3 and the second laser light B4 pass through the second optical module and then are emitted along the B5 directionThe light beam is completely absorbed by the absorber. Therefore, after the second diffracted light B3 and the second laser B4 pass through the second sound optical module, the two separated light beams have opposite splitting ratios, the flexible regulation and control of the intensity of the continuous component and the pulse component in the third diffracted light B6 light beam can be realized by regulating and controlling the voltage of the second sound optical module, the first sound optical module mainly controls the on-off and the intensity of the continuous laser, and the driving signals on the first sound optical module and the second sound optical module are regulated and controlled by the time sequence signal control unit.
The relationship between the light intensities of the main beams in the optical path is given below. Let the light intensity of the first laser B1 be I1The intensity of the first diffracted light B2 is I2The intensity of the second diffracted light B3 is I3The light intensity of the second laser B4 is I4The intensity of the third diffracted light B5 is I5The fourth diffracted light B6 has intensity I6. Let the diffraction efficiency of the first acousto-optic module be eta1Diffraction efficiency of the second acousto-optic module is η2. Then there is
I2＝I1(1-η1)
I3＝I1η1
I5＝I3η2+I4(1-η2)＝I1η1η2+I4(1-η2)
I6＝I3(1-η2)+I4η2＝I1η1(1-η2)+I4η2
Due to η1And η2All can take values between 0 and 90 percent, so that I6The adjustable range of the ratio of the medium continuous component to the pulse component can cover most application scenes.
In one embodiment, the timing signal control unit transmits two driving electrical signals with independent timings to the first acousto-optic module and the second acousto-optic module respectively to independently control the ratio of the light intensity of the diffracted light to the incident light in each acousto-optic module. For example, a first acousto-optic module is controlled with a drive signal 1, and a second acousto-optic module is controlled with a second drive signal 2. Furthermore, the driving electric signal can be a pulse signal, and the diffraction efficiency of the corresponding acousto-optic module is adjusted by adjusting the amplitude of the driving electric signal, so that the time sequence and the intensity of the composite light are controlled.
The invention also relates to a time sequence programmable composite laser pulse control method, which comprises the following steps: providing any one of the time sequence programmable composite laser pulse control systems; and adjusting the time sequence and the intensity of the electric signal emitted by the time sequence signal control unit to form composite laser with different time sequences and intensities.
To further illustrate the application of the present invention in detail, several control schemes for generating different timing composite laser outputs are provided as shown in FIG. 3.
For case 1, in a given time period, the driving signals 2 are all 0, and the timing waveform of the driving signal 1 has three high levels, so that the levels satisfy the acousto-optic deflection efficiency η of the first acousto-optic module for the first laser B1 under the condition of the levels1A maximum of 90% is reached and the magnitude of this level is denoted EL 1. It can be seen that the waveform of the composite laser output in this case is identical to the waveform of the drive signal 1, in which the output light is composed entirely of the continuous laser, has no pulse component, and has an intensity of 90% of the output intensity of the continuous laser.
For case 2, in a given time period, the driving signal 1 is 0, and the driving signal 2 has three high levels in the timing waveform, the level is EL1, and the acousto-optic deflection efficiency η of the second sound-light module to the second B4 is at this time2A maximum of 90% is reached. It can be seen that the waveform of the composite laser output under this condition is divided into three segments, each segment is composed of pulse laser, the corresponding time interval is completely consistent with the high level stage in the waveform of the driving signal 2, and the intensity is 90% of the output intensity of the pulse laser.
For case 3, drive signal 1 is alternately switched with drive signal 2 for the given time period, both with high levels of EL 1. In this case, the output composite laser waveform is formed by alternating the continuous laser and the pulse laser in time sequence, and the intensity is 90% of the output intensity of the laser.
For case 4, the drive signal 1 is atRising to high level at a certain time and keeping, wherein the level is EL1, and the time sequence waveform of the driving signal 2 contains three high levels, the levels are all to make the acousto-optic deflection efficiency eta2The value was 50% and was designated as EL 2. It can be seen that the waveform of the composite laser output in this case is complex, when the driving signal 1 changes to high level, the composite laser is completely composed of continuous laser when the driving signal 2 is 0, and when the driving signal 2 is high level, the composite laser contains both continuous and pulse components, the intensity of the continuous component is 45% of the output intensity of the continuous laser, and the pulse component is 50% of the output intensity of the pulse laser.
For case 5, in a given time period, the driving signal 1 and the driving signal 2 are alternately switched, and each waveform of the driving signal 1 is a slowly falling triangular wave which is reduced from EL1 to 0, and the high level of the driving signal 2 is EL 1. It can be seen that the composite laser output in this case appears as continuous laser light and pulse laser light alternately in time series, and unlike case 3, the continuous component is subjected to intensity modulation, gradually attenuating to 0 in each segment.
The control mode of the invention is not limited to only realizing the conditions listed in the embodiment, and the drive signal transmission with any time sequence programming can be realized, so that the flexible regulation and control of the time sequence and the intensity of the continuous component and the pulse component in the composite laser are realized.
Generally, the scheme uses an acousto-optic module, an ultrasonic field is generated in the acousto-optic module, and incident light is controlled to form a Bragg angle thetaBThe laser beam enters the acousto-optic module, generates acousto-optic interaction with an ultrasonic field of the acousto-optic module, generates Bragg diffraction, can combine two lasers with wavelengths in a wider bandwidth range, has no specific requirement on the polarization state of the incident laser, and cannot reduce the beam quality of output light after combination; according to the scheme, two acousto-optic modules are used, the first laser and the second laser pass through the two acousto-optic modules and then are finally synthesized into the third diffraction light and the fourth diffraction light, at least one of the third diffraction light and the fourth diffraction light can be used as composite laser, the light intensity of the composite laser is synthesized by the first laser and the second laser according to a certain proportion, and the proportion is equal to the proportion of diffraction formed by each acousto-optic moduleThe ratio of the light intensity of the light to the incident light is related, and the ratio of the intensity of the diffracted light of each acousto-optic module to the intensity of the incident light can be adjusted by adjusting the intensity and the time sequence of the electric signal emitted by the time sequence signal control unit, so that the intensity and the time sequence of the first laser and the second laser in the composite laser can be flexibly regulated and controlled to synthesize the composite laser with required intensity and time sequence.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A time sequence programmable composite laser pulse control system is characterized by comprising a first laser, a second laser, a first acousto-optic module, a second acousto-optic module and a time sequence signal control unit, wherein the time sequence programmable composite laser pulse control system comprises a first laser, a second laser, a first acousto-optic module, a second acousto-optic module and a time sequence signal control unit
The first laser is used for emitting a Bragg angle theta as an incident angle to the first acousto-optic moduleBThe first laser of (2);
the first acousto-optic module is used for generating an ultrasonic field to enable the first laser to generate Bragg diffraction to form first diffraction light and second diffraction light, and the second diffraction light forms a Bragg angle thetaBIncident to the second sound optical module;
the second laser is used for emitting an incident angle to the second acoustic optical module as a Bragg angle thetaBThe second laser and the second diffracted light are positioned on two sides of the optical normal of the second optical module;
a second sound optical module for generating an ultrasonic field to bragg-diffract a second laser beam and a second diffracted beam, respectively, to form a first sub-diffracted beam and a second sub-diffracted beam corresponding to the second laser beam, and a third sub-diffracted beam and a fourth sub-diffracted beam corresponding to the second diffracted beam, wherein the first sub-diffracted beam and the fourth sub-diffracted beam have the same propagation direction, and synthesize a third diffracted beam, and the second sub-diffracted beam and the third diffracted beam have the same propagation direction, and synthesize a fourth diffracted beam, and at least one of the third diffracted beam and the fourth diffracted beam is used as a composite laser beam;
and the time sequence signal control unit is used for transmitting electric signals to the first acousto-optic module and the second acousto-optic module so as to control the intensity of an ultrasonic field in each acousto-optic module and adjust the ratio of the light intensity of diffracted light to the light intensity of incident light.
2. The composite laser pulse control system of claim 1 wherein one of the first laser and the second laser is a continuous laser and the other is a pulsed laser.
3. The composite laser pulse control system of claim 1, wherein each acousto-optic module comprises a piezoelectric transducer and an acousto-optic interaction medium, the piezoelectric transducer converts the electrical signal into an ultrasonic signal with a corresponding frequency, and transmits the ultrasonic signal into the acousto-optic interaction medium, and an ultrasonic field with a specific frequency is formed in the acousto-optic interaction medium, so that the incident angle is a bragg angle θBThe incident light and the ultrasonic field generate acousto-optic interaction to generate Bragg diffraction to form two beams of diffraction light, wherein the direction of one beam of diffraction light is the same as that of the incident light, and the included angle of the two beams of diffraction light is 2 thetaB。
4. The composite laser pulse control system of claim 3, wherein the material of the acousto-optic interaction medium is quartz crystal or quartz glass.
5. The composite laser pulse control system of claim 3, wherein the first laser and the second laser emit laser light at the same wavelength.
6. The composite laser pulse control system of claim 1, wherein the timing signal control unit transmits two independently timed driving electrical signals to the first acousto-optic module and the second acousto-optic module, respectively, to independently control the ratio of the intensity of diffracted light to the intensity of incident light in each acousto-optic module.
7. The composite laser pulse control system of claim 6, wherein the driving electrical signal is a pulsed signal.
8. The composite laser pulse control system of claim 1, further comprising a first fully reflective mirror, a second fully reflective mirror, and an absorber, wherein,
the first total reflection mirror and the second total reflection mirror are used for reflecting the first diffracted light to an absorber;
the absorber absorbs the first diffracted light and the third diffracted light.
9. The composite laser pulse control system of claim 7, further comprising a third all-mirror and a beam expander, wherein,
the third full mirror is used for reflecting the fourth diffraction light to the beam expander;
and the beam expander is used for outputting composite laser after collimating and focusing the fourth diffracted light.
10. A method for time-programmable composite laser pulse control, comprising:
providing a time-programmable composite laser pulse control system according to any one of claims 1 to 9;
and adjusting the time sequence and the intensity of the electric signal emitted by the time sequence signal control unit to form composite laser with different time sequences and intensities.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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