CN114389130B - Laser device - Google Patents
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- CN114389130B CN114389130B CN202111506538.6A CN202111506538A CN114389130B CN 114389130 B CN114389130 B CN 114389130B CN 202111506538 A CN202111506538 A CN 202111506538A CN 114389130 B CN114389130 B CN 114389130B
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/07—Construction or shape of active medium consisting of a plurality of parts, e.g. segments
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Abstract
The invention discloses a laser, comprising: the first working cavity is used for generating first pulse laser; the switching module is coupled with the first working cavity; the second working cavity is coupled with the switching module and used for receiving the first pulse laser; the light splitting module is coupled with the second working cavity and used for performing light splitting operation on the first pulse laser to generate detection laser, output laser and second pulse laser; the power detection module is connected with the light splitting module and used for generating a first detection signal according to the detection laser; the control module is used for generating a first switching signal or a second switching signal according to the first detection signal; the amplifying module is used for amplifying the second pulse laser according to the first switching signal and is also used for switching off according to the second switching signal; the light splitting module is further used for performing light splitting operation on the amplified second pulse laser. The laser can reduce the working time of the first working cavity, thereby prolonging the service life of the laser.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a laser.
Background
In the related art, a laser can focus pulse energy in a very short time to form a very high power density, and thus is widely applied to the fields of scientific research, medical treatment, industry and the like.
However, the laser is susceptible to wear due to its operating characteristics, thereby affecting the lifetime of the laser.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a laser which can reduce the working time of a first working cavity in the laser, thereby prolonging the service life of the laser.
In a first aspect, the present application provides a laser comprising: the first working cavity is used for generating first pulse laser; one end of the switching module is coupled with the first working cavity; the second working cavity is coupled with the other end of the switching module and used for receiving the first pulse laser; the light splitting module is coupled with the second working cavity and is used for performing light splitting operation on the first pulse laser to generate detection laser, output laser and second pulse laser; the power detection module is connected with the light splitting module and used for generating a first detection signal according to the detection laser; the control module is respectively and electrically connected with the first working cavity, the switching module, the second working cavity and the power detection module, and the control module is used for generating a first switching signal or a second switching signal according to the first detection signal; the amplifying module is respectively connected with the second working cavity and the control module, and is used for amplifying the first pulse laser and the second pulse laser according to the first switching signal and switching off according to the second switching signal; the light splitting module is further used for performing the light splitting operation on the amplified second pulse laser;
the switching module is used for being switched on according to the first switching signal, and the first working cavity is used for being switched off according to the first switching signal and the second switching signal; the switching module is used for switching off according to the second switching signal.
In this embodiment, a light splitting module is arranged to perform a light splitting operation on the first pulse laser to obtain an output laser, a detection laser, and a second pulse laser. After the second working cavity amplifies the second pulse laser, the second pulse laser after the amplification operation is split again by the splitting module, so that the second pulse laser for amplification is continuously generated in the second working cavity, the laser can continuously output the pulse laser under the condition that the first working cavity stops working, the service life of the laser is prolonged, and the detection laser is detected by the power detection module to ensure that the laser stops working in time when the output power is unstable.
In some embodiments, the first working chamber comprises:
the first pump source is electrically connected with the control module and is used for generating first pump light; the first pump source is also used for switching off according to the first switching signal and the second switching signal; and the trigger cavity is coupled with the first pump source and used for generating the first pulse laser according to the first pump light.
In some embodiments, the trigger chamber comprises: the first wavelength division multiplexing unit is coupled with the first pump source and used for receiving the first pump light; one end of the first grating is coupled with one end of the first wavelength division multiplexing unit; one end of the first gain fiber is coupled with the other end of the first wavelength division multiplexing unit and is used for generating the first pulse laser according to the first pump light; and an absorber mirror disposed at the other end of the first gain fiber.
In some embodiments, the trigger chamber further comprises: one end of the focusing unit is coupled with the other end of the first gain fiber; and one end of the first isolation unit is coupled with the other end of the first grating, and the other end of the first isolation unit is coupled with the switching module.
In some embodiments, the trigger chamber comprises: the first wavelength division multiplexing unit is coupled with the first pump source and used for receiving the first pump light; one end of the first gain fiber is coupled with one end of the first wavelength division multiplexing unit and is used for generating the first pulse laser according to the first pump light; the first light splitting unit is coupled with the first gain optical fiber; the first isolation unit is coupled with the first light splitting unit and the switching module respectively; the filtering unit is coupled with the first light splitting unit; the first annular unit is coupled with the first wavelength division multiplexing unit and the filtering unit respectively; one end of the focusing unit is coupled with the first annular unit; an absorber mirror disposed at the other end of the focusing unit.
In some embodiments, the light splitting module comprises: the second light splitting unit is coupled with the second working cavity and is used for performing light splitting operation on the first pulse laser to generate second pulse laser and third pulse laser; one end of the second isolation unit is coupled with the second light splitting unit; and one end of the third light splitting unit is coupled with the other end of the second isolation unit, and the other end of the third light splitting unit is coupled with the power detection module and is used for performing light splitting operation on the third pulse laser to generate the detection laser and the output laser.
In some embodiments, the amplification module comprises: the second pumping source is respectively electrically connected with the control module and coupled with the second working cavity and is used for generating second pumping light; the second pump source is further configured to be turned on according to the first switching signal, and the second pump source is further configured to be turned off according to the second switching signal; and the second working cavity is used for amplifying the second pulse laser according to the second pump light.
In some embodiments, the second working chamber comprises: one end of the second wavelength division multiplexing unit is coupled with the second pump source; the other end of the second wavelength division multiplexing unit is coupled with the switching module and is used for receiving the second pumping light and the second pulse laser; one end of the second gain fiber is coupled with one end of the second wavelength division multiplexing unit; the other end of the second gain optical fiber is coupled with one end of the second light splitting unit and is used for amplifying the second pulse laser; the second grating is coupled with the switching module; and the second annular unit is coupled and connected with the switching module, the other end of the second wavelength division multiplexing unit and the second light splitting unit respectively.
In some embodiments, the second working chamber comprises: one end of the second wavelength division multiplexing unit is coupled with the second pump source; the other end of the second wavelength division multiplexing unit is coupled with the switching module and is used for receiving the second pumping light and the second pulse laser; one end of the second gain fiber is coupled with one end of the second wavelength division multiplexing unit; the other end of the second gain optical fiber is coupled with one end of the second light splitting unit and is used for amplifying the second pulse laser; the reflecting mirror is coupled with one end of the second light splitting unit; and the second grating is coupled with the switching module.
In some embodiments, the coupling connection is a polarization maintaining fiber connection.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic diagram of a laser according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a laser;
FIG. 3 is a schematic diagram of another laser structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another embodiment of a laser;
reference numerals are as follows: the laser device 100, the first working cavity 110, the absorber mirror 111, the focusing unit 112, the first gain fiber 113, the first wavelength division multiplexing unit 114, the first grating 115, the first isolation unit 116, the first pump source 117, the first ring unit 118, the filtering unit 119, the first light splitting unit 101, the switching module 120, the second working cavity 130, the second wavelength division multiplexing unit 131, the second gain fiber 132, the second ring unit 133, the second grating 134, the mirror 135, the light splitting module 140, the second light splitting unit 141, the third light splitting unit 142, the second isolation unit 143, the power detection module 150, the amplification module 160, and the control module 170.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present numbers, and larger, smaller, inner, etc. are understood as including the present numbers. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As a device capable of emitting laser light, a laser device can be classified into a continuous laser device and a pulse laser device according to its operation mode and operation state. The ultrafast laser is a pulse laser, and can generate pulse laser with pulse width in picosecond or femtosecond level based on SESAM (saturable absorber) mode locking technology. Meanwhile, the ultrafast laser has excellent output performance, ultrashort pulse width information energy, high single pulse energy, high repetition frequency and the like, so that the ultrafast laser is widely applied to the scientific research fields of laser fine micromachining, biomedicine and high-field optics. However, in the mode locking technology based on the SESAM, the saturable absorber is used as a key device for mode locking, and bears extremely high peak power density in the laser, and is easy to damage after being focused by strong light for a long time, and the saturable absorber is difficult to replace after being damaged, thereby affecting the normal operation of the laser. Therefore, a reasonable way needs to be selected to prolong the service life of the laser.
Based on this, this application has proposed a laser, can reduce the operating time of saturable absorber to the life of extension laser.
Referring to fig. 1, in a first aspect, the present application provides a laser 100, including: a first working chamber 110 for generating a first pulsed laser light; a switching module 120, wherein one end of the switching module 120 is coupled to the first working chamber 110; a second working chamber 130 coupled to the other end of the switching module 120, for receiving the first pulse laser; a light splitting module 140 coupled to the second working cavity 130, configured to perform light splitting on the first pulse laser to generate detection laser, output laser, and second pulse laser; a power detection module 150 connected to the light splitting module 140, configured to generate a first detection signal according to the detection laser; a control module 170 electrically connected to the first working chamber 110, the switching module 120, the second working chamber 130 and the power detection module 150, respectively, wherein the control module 170 is configured to generate a first switching signal or a second switching signal according to the first detection signal; the amplifying module 160 is connected to the second working chamber 130 and the control module 170, respectively, and the amplifying module 160 is configured to amplify the first pulse laser and the second pulse laser according to the first switching signal and is further configured to turn off according to the second switching signal; the light splitting module 140 is further configured to perform the light splitting operation on the amplified second pulse laser.
Wherein the switching module 120 is configured to be turned on according to the first switching signal, and the first working chamber 110 is configured to be turned off according to the first switching signal and the second switching signal; the switching module 120 is configured to turn off according to the second switching signal.
It is understood that, in the present embodiment, the first working cavity 110 is a laser 100 based on the SESAM mode locking technology, and the first pulse laser, which is a stable ultrashort pulse laser, can be generated through the working medium, the excitation source and the resonant cavity provided in the first working cavity 110. The output end of the first working chamber 110 is further coupled to one end of the switching module 120, and when the switching module 120 is turned on, the first pulsed laser generated by the first working chamber 110 is transmitted to the switching module 120 from the output end thereof. The other end of the switching module 120 is also coupled to the second working chamber 130, so that the first pulse laser can be transmitted from the switching module 120 to the second working chamber 130. The first pulse laser light can be transmitted to the laser output port of the laser 100 in the second working chamber 130 via the optical path system.
It will be appreciated that the first pulsed laser light output from the laser output port is generated and amplified only by the first working chamber 110, and therefore, in order to continuously obtain the pulsed laser light with high power density, the first working chamber 110 needs to be operated continuously to generate the first pulsed laser light, and the long-term operation will affect the service life of the first working chamber 110. For this purpose, the embodiment obtains a new stable pulse laser output by arranging the light splitting module 140 to perform light splitting operation on the first pulse laser and obtain a second pulse laser, and pumping and amplifying the second pulse laser through the second working cavity 130 and the amplifying module 160. From the foregoing, it can be seen that the new pulsed laser output is obtained only by the amplification operation of second working chamber 130 and amplification module 160, and need not be generated by first working chamber 110, thus reducing the working time of first working chamber 110. By performing the splitting operation again on the second pulse laser obtained by the splitting operation in the second working chamber 130, the pulse laser for amplifying operation can be continuously generated in the second working chamber 130, so that the first working chamber 110 can stop working after outputting the stable first pulse laser, thereby prolonging the service life of the laser 100 by reducing the service time of the first working chamber 110.
It can be understood that, since the first pulse laser generated by the first working chamber 110 or the second pulse laser amplified by the second working chamber 130 and the amplifying module 160 does not necessarily reach the requirement of the laser power output by the laser 100, the power detecting module 150 and the control module 170 need to be arranged to detect the laser power to obtain the detection signals (the first detection signal and the second detection signal), and the control module 170 generates the corresponding switching signals (the first switching signal and the second switching signal) according to the detection signals to control the laser 100 to generate stable pulse laser.
Specifically, the light splitting module 140 is coupled to the second working chamber 130, and can perform light splitting operation on the pulse laser (the first pulse laser or the second pulse laser) entering the second working chamber 130, and divide the pulse laser into pulse lasers propagating along different ports of the light splitting module 140. The light splitting module 140 is further coupled to a power detection module 150, and the power detection module 150 is configured to collect laser power. In this embodiment, after the first pulse laser is transmitted to the second working cavity 130 through the switching module 120, the light splitting module 140 performs light splitting operation to generate a detection laser, an output laser, and a second pulse laser, where the three lasers propagate along different ports of the light splitting module 140. The output laser is transmitted to the laser output port of the laser 100, the second pulse laser returns to the second working chamber 130, the amplification module 160 performs amplification operation, and the detection laser is emitted to the power detection module 150, so that the power detection module 150 can obtain a first detection signal according to the detection laser. The first detection signal is used to indicate whether the first pulse laser generated by the first working chamber 110 is working normally. When the first pulse laser works normally, the control module 170 generates a first switching signal according to the first detection signal. The control module 170 controls the first working chamber 110 to stop generating the pulsed laser according to the first switching signal, and the switching module 120 is turned on, and the second working chamber 130 starts to work. That is, when the control module 170 receives the first detection signal, it indicates that the first pulse laser generated by the first working chamber 110 is in a state of stable output power, at this time, the control module 170 controls the first working chamber 110 to stop generating the first pulse laser, and the switching module 120 is turned on. When the first pulse laser works abnormally, the control module 170 generates a second switching signal according to the first detection signal, each module of the laser 100 stops working according to the second switching signal, and the control module 170 generates and sends alarm information to facilitate timely inspection and maintenance.
Specifically, when the switching module 120 is turned on, the first pulse laser cannot pass through the switching module 120, and the pulse laser in the second working chamber 130 can be circularly transmitted for reflection amplification. After the first pulse laser normally works, the control module 170 controls the amplification module 160 to start working through the first switching signal, so as to pump and amplify the first pulse laser transmitted to the second working cavity 130, and transmit the first pulse laser to the light splitting module 140 to perform light splitting operation, so as to obtain the second pulse laser. The amplification module 160 continuously performs an amplification operation on the pulse laser light (second pulse laser light) obtained by the light splitting operation, thereby being capable of outputting the pulse laser light for a long time. The time of the pulse laser (the first pulse laser and the second pulse laser) running in the first working cavity and the second working cavity is identical.
It is understood that in order to obtain a stable pulse laser output, after the control module 170 outputs the first switching signal and the first working chamber 110 stops working according to the first switching signal, the pulse laser output from the second working chamber 130 needs to be continuously detected. Specifically, the amplified second pulse laser is transmitted to the light splitting module 140 for light splitting operation, so as to obtain the detection laser. The power detection module 150 obtains a second detection signal according to the detection laser, where the second detection signal is used to indicate whether the working state of the second working chamber 130 is normal. The control module 170 processes the second detection signal, and when the second detection signal is within a preset threshold interval, the control module 170 controls the amplification factor of the amplification module in real time to stabilize the laser power; when the second detection signal is outside the preset threshold interval, that is, the second working chamber works abnormally, the control module 170 generates a second switching signal, the second working chamber 130 is turned off (stops the amplification operation) according to the second switching signal, and the switching module 120 is turned off (the first pulse laser can pass through the switching module 120). At this time, the respective modules in the laser 100 stop operating to be solved. Therefore, when the power of the laser generated by the laser 100 does not satisfy the preset threshold, the control module 170 can control the laser 100 to stop working, and send the alarm information, so as to facilitate timely inspection and maintenance.
In the embodiment, the light splitting module 140 is arranged to perform light splitting operation on the first pulse laser to obtain the output laser, the detection laser and the second pulse laser. After the amplification module 160 amplifies the second pulse laser, the light splitting module 140 splits the amplified second pulse laser again, so that the amplified second pulse laser is continuously generated in the second working chamber 130, the laser 100 can continuously output the pulse laser under the condition that the first working chamber 110 stops working, the service time of the first working chamber 110 is shortened, the service life of the laser 100 is prolonged, and the detection laser is detected by the power detection module 150 to ensure that the laser 100 can output stable pulse laser.
Referring to fig. 2, in some embodiments, the first working chamber 110 includes:
a first pump source 117 electrically connected to the control module 170 for generating a first pump light; the first pump source 117 is further configured to turn off according to the first switching signal and the second switching signal; a trigger cavity coupled to the first pump source 117 for generating the first pulsed laser according to the first pump light.
It can be understood that the laser 100 can be classified into different types of lasers 100 according to the working medium thereof, but the basic principles of generating laser light are the same, i.e. three basic conditions of population inversion, optical feedback and laser threshold reaching are required, so the three essential elements of the laser 100 in this embodiment are: working medium, excitation source and resonant cavity. In this embodiment, the trigger cavity includes a working medium and a resonant cavity, and the first pump source 117 is used as an excitation source for generating laser light, and is used for exciting the trigger cavity to generate a first pulse laser light. As can be seen from the above, the first working chamber 110 can be stopped or started under the control of the control module 170, and in particular, the control module 170 is electrically connected to the first pump source 117. After the laser 100 is powered on, the control module 170 starts to work, and determines the working state of the switching module 120, when the switching module 120 is in the above-mentioned conducting state, the control module 170 controls the first pumping source 117 to generate the first pumping light, the first working cavity 110 generates the first pulse laser according to the first pumping light, and the first pulse laser can be transmitted to the second working cavity 130 through the conducting switching module 120 to perform an amplifying operation, so as to obtain the output pulse laser with high power. When the control module 170 determines that the switching module 120 is in the off state (the first pulse laser cannot pass through the switching module 120), the control module 120 is controlled to switch to the on state, and then the first pump source is controlled to start pumping, so as to generate the first pulse laser.
It can be understood that, the power detection module 150 detects the detection laser obtained by the first pulse laser through the light splitting operation, when the detection laser meets the preset threshold interval, the control module 170 outputs a first switching signal to the first pumping source 117, and controls the first pumping source 117 to stop pumping, so that the trigger cavity cannot generate the first pulse laser, and the first working cavity 110 stops working. When the detected laser does not meet the preset threshold interval, the control module 170 outputs a second switching signal to the first pump source 117, and the first pump source 117 stops working, and meanwhile, other modules are also in a state of stopping working.
Referring again to fig. 2, in some embodiments, the trigger chamber includes: a first wavelength division multiplexing unit 114 coupled to the first pump source 117, for receiving the first pump light; a first grating 115, wherein one end of the first grating 115 is coupled to one end of the first wavelength division multiplexing unit 114; a first gain fiber 113, where one end of the first gain fiber 113 is coupled to the other end of the first wavelength division multiplexing unit 114, and is configured to generate the first pulse laser according to the first pump light; and an absorber mirror 111 provided at the other end of the first gain fiber 113.
It will be appreciated that lasing of the laser 100 requires a working medium, a resonant cavity and an excitation source. From the above it is known to include a working medium and a resonator in the triggering chamber.
Specifically, as shown in fig. 2, the first wavelength division multiplexing unit 114 is coupled to the first pump source 117 and the first gain fiber 113, respectively, for coupling the first pump light into the first gain fiber 113. The first gain fiber 113 generates stimulated radiation amplification on the first pump light to generate stimulated radiation light, wherein the first gain fiber 113 can select a polarization-maintaining ytterbium-doped fiber. On both sides of the first gain fiber 113, an absorber mirror 111 and a first grating 115 are provided, respectively, for constituting a resonant cavity of the first working cavity 110. The stimulated emission light generated by the first gain fiber 113 under the excitation of the first pump light forms a first pulsed laser back and forth in the resonant cavity. Wherein the absorber mirror 111 is optionally a saturable absorber mirror, the saturable absorber mirror 111 combining a saturable absorber with a mirror 135. The first grating 115 may be a low reflection polarization maintaining chirped grating. Since the first grating 115 is a low-reflection polarization-maintaining chirped grating, the intracavity dispersion can be matched to achieve a mode-locked state, and the first pulse laser can be emitted due to the low-reflection property. The first pulsed laser light formed in the resonant cavity is output to the switching module 120 through the first grating 115 for transmission.
Referring again to fig. 2, in some embodiments, the trigger chamber further comprises: a focusing unit 112, one end of the focusing unit 112 being coupled to the other end of the first gain fiber 113; and a first isolation unit 116, wherein one end of the first isolation unit 116 is coupled to the other end of the first grating 115, and the other end of the first isolation unit 116 is coupled to the switching module 120.
It will be appreciated that the focusing unit 112 is disposed between the first gain fiber 113 and the absorber mirror 111 for controlling the size of the light spot entering the saturable absorber. The isolation unit is disposed between the first grating 115 and the switching module 120, and is used for preventing the first working chamber 110 from being affected by external return light, so as to affect the power of the first pulse laser generated by the first working chamber 110. It can be understood that the trigger chamber is a linear trigger chamber according to the above-mentioned connection structure of the trigger chamber.
Referring to fig. 3, in some embodiments, the trigger chamber includes: a first wavelength division multiplexing unit 114 coupled to the first pump source 117, for receiving the first pump light; a first gain fiber 113, one end of the first gain fiber 113 is coupled to one end of the first wavelength division multiplexing unit 114, and is configured to generate the first pulse laser according to the first pump light; a first light splitting unit 101 coupled to the first gain fiber 113; a first isolation unit 116 coupled to the first light splitting unit 101 and the switching module 120, respectively; a filtering unit 119 coupled to the first light splitting unit 101; a first ring unit 118 coupled to the first wavelength division multiplexing unit 114 and the filtering unit 119 respectively; a focusing unit 112, one end of the focusing unit 112 is coupled with the first annular unit 118; and an absorber mirror 111 provided at the other end of the focusing unit 112.
It is understood that the trigger chamber described in this embodiment is an annular trigger chamber. Wherein the ring units (the first ring unit 118 and the second ring unit 133) can be selected as polarization maintaining circulators for unidirectional transmission of the laser light in the first working chamber 110. The optical splitting units (the first optical splitting unit 101, the second optical splitting unit 141, and the third optical splitting unit 142) may select a polarization maintaining coupler, and are configured to split laser light in the ring cavity and couple the split laser light to different ports for transmission. The filter may be a selectable polarization maintaining filter.
It is understood that the ring-shaped trigger cavity or the linear trigger cavity in the present embodiment can be selected as the trigger cavity in the first working cavity 110 of the laser 100, or other trigger cavities capable of generating pulsed laser light according to the actual use requirement.
Referring again to fig. 2, in some embodiments, the light splitting module 140 includes: a second light splitting unit 141, coupled to the second working chamber 130, for performing a light splitting operation on the first pulse laser to generate the second pulse laser and a third pulse laser; a second isolation unit 143, one end of the second isolation unit 143 being coupled to the second light splitting unit 141; and a third light splitting unit 142, where one end of the third light splitting unit 142 is coupled to the other end of the second isolation unit 143, and the other end of the third light splitting unit 142 is coupled to the power detection module 150, and is configured to perform a light splitting operation on the third pulse laser to generate the detection laser and the output laser.
It is understood that the second light splitting unit 141 is coupled to the second working chamber 130. It is known from the above that the second working chamber 130 will amplify the first pulse laser after the switching module 120 is turned off. In this embodiment, the second light splitting unit 141 performs a light splitting operation on the amplified first pulse laser, so that a part of pulse laser (second pulse laser) is split from the amplified first pulse laser before the amplified first pulse laser is output by the light splitting module 140 and returns to the second working cavity 130, and the second working cavity 130 can still perform the amplification operation on the second pulse laser obtained by the light splitting operation under the condition that the first working cavity 110 stops generating the first pulse laser, so as to obtain the output pulse laser again. The pulsed laser still passes through the second light splitting unit 141 for light splitting operation before being output, and the second working chamber 130 can continuously obtain the pulsed laser for amplification operation, so that high-power pulsed laser output is obtained.
Specifically, the third light splitting unit 142 and the second light splitting unit 141 are coupled and connected through the second isolation unit 143. The second isolation unit 143 is used to prevent the return light from affecting the performance of the second working chamber 130. The third light splitting unit 142 is configured to split the pulse laser light split by the second light splitting unit 141 again to obtain detection laser light and output laser light, couple the detection laser light to the power detection module 150 to perform power detection, and transmit the output laser light to an output port. It can be understood that, in addition to detecting whether the power of the first pulse laser meets the standard of triggering laser, the power detection module 150 also detects whether the power of the second pulse laser after amplification operation meets the standard of outputting laser. Therefore, after the control module 170 controls the laser 100 to operate normally (the first working chamber 110 stops operating, and the second working chamber 130 starts operating), the control module 170 needs to update its power detection standard to ensure that the power of the pulsed laser output from the second working chamber 130 is stable.
Referring again to fig. 2, in some embodiments, the amplification module 160 includes: a second pump source electrically connected to the control module 170 and coupled to the second working cavity 130, respectively, for generating a second pump light; the second pump source is further configured to be turned on according to the first switching signal, and the second pump source is further configured to be turned off according to the second switching signal; the second working cavity 130 is configured to amplify the second pulse laser according to the second pump light.
Referring again to fig. 2, in some embodiments, the second working chamber 130 includes: a second wavelength division multiplexing unit 131, where one end of the second wavelength division multiplexing unit 131 is coupled to the second pump source; the other end of the second wavelength division multiplexing unit 131 is coupled to the switching module 120, and is configured to receive the second pump light and the second pulse laser; a second gain fiber 132, wherein one end of the second gain fiber 132 is coupled to one end of the second wavelength division multiplexing unit 131; the other end of the second gain fiber 132 is coupled to one end of the second optical splitting unit 141, and is configured to amplify the second pulse laser; a second grating 134 coupled to the switching module 120; and a second ring unit 133 coupled to the switching module 120, the other end of the second wavelength division multiplexing unit 131, and the second light splitting unit 141, respectively.
It is understood that the second pump source is configured to generate a second pump light, and the second pump light is coupled into the second gain fiber 132 through the second wavelength division multiplexing unit 131 to perform an amplification operation on the second pulsed laser light in the second working cavity 130. The second grating 134 may be a high-reflection polarization-maintaining chirped grating, and is coupled to the switching module 120, for reflecting the second pulse laser. The second grating 134 also serves to compensate for dispersion in the second working cavity 130 to ensure that the second working cavity 130 has a uniform dispersion coefficient with the first working cavity 110. The second annular unit 133 is used to make the second working chamber 130 form a unidirectional working chamber. It will be appreciated that the second working chamber 130 is known as an annular working chamber, in accordance with the above-described coupling structure thereof.
Referring to fig. 4, in some embodiments, the second working chamber 130 includes: a second wavelength division multiplexing unit 131, where one end of the second wavelength division multiplexing unit 131 is coupled to the second pump source; the other end of the second wavelength division multiplexing unit 131 is coupled to the switching module 120, and is configured to receive the second pump light and the second pulse laser; a second gain fiber 132, wherein one end of the second gain fiber 132 is coupled to one end of the second wavelength division multiplexing unit 131; the other end of the second gain fiber 132 is coupled to one end of the second optical splitting unit 141, and is configured to amplify the second pulse laser; a reflector 135 coupled to one end of the second light splitting unit 141; and a second grating 134 coupled to the switching module 120.
It will be appreciated that the second working chamber 130 in this embodiment is a linear working chamber. According to practical situations, the annular working cavity or the linear working cavity can be selected as the second working cavity 130 in the laser 100, or other working cavities capable of amplifying the pulsed laser light.
In some embodiments, the coupling connection is a polarization maintaining fiber connection.
Specifically, in the above embodiment, the coupling connections of the devices may be connected through a polarization-maintaining fiber to ensure the polarization state of the laser.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A laser, comprising:
the first working cavity is used for generating first pulse laser;
one end of the switching module is coupled with the first working cavity;
the second working cavity is coupled with the other end of the switching module and used for receiving the first pulse laser;
the light splitting module is coupled with the second working cavity and is used for performing light splitting operation on the first pulse laser to generate detection laser, output laser and second pulse laser;
the power detection module is connected with the light splitting module and used for generating a first detection signal according to the detection laser;
the control module is electrically connected with the first working cavity, the switching module, the second working cavity and the power detection module respectively; the first detection signal is used for representing whether the first pulse laser works normally or not; when the first pulse laser works normally, the control module is used for generating a first switching signal according to the first detection signal; when the first pulse laser works abnormally, the control module is used for generating a second switching signal according to the first detection signal;
the amplifying module is respectively connected with the second working cavity and the control module, and is used for respectively amplifying the first pulse laser and the second pulse laser according to the first switching signal; the light splitting module is further used for performing the light splitting operation on the amplified second pulse laser;
the switching module is used for being conducted according to the first switching signal, and the first working cavity is used for stopping generating the first pulse laser according to the first switching signal; the first working cavity, the switching module, the second working cavity, the light splitting module and the amplifying module are all used for stopping working according to the second switching signal.
2. The laser of claim 1, wherein the first working cavity comprises:
the first pump source is electrically connected with the control module and is used for generating first pump light; the first pump source is further configured to stop generating the first pump light according to the first switching signal, and the first pump source is further configured to stop operating according to the second switching signal;
and the trigger cavity is coupled with the first pump source and used for generating the first pulse laser according to the first pump light.
3. The laser of claim 2, wherein the firing chamber comprises:
the first wavelength division multiplexing unit is coupled with the first pump source and used for receiving the first pump light;
one end of the first grating is coupled with one end of the first wavelength division multiplexing unit;
one end of the first gain fiber is coupled with the other end of the first wavelength division multiplexing unit and is used for generating the first pulse laser according to the first pump light;
and an absorber mirror disposed at the other end of the first gain fiber.
4. The laser of claim 3, wherein the firing chamber further comprises:
one end of the focusing unit is coupled with the other end of the first gain fiber;
and one end of the first isolation unit is coupled with the other end of the first grating, and the other end of the first isolation unit is coupled with the switching module.
5. The laser of claim 2, wherein the firing chamber comprises:
the first wavelength division multiplexing unit is coupled with the first pump source and used for receiving the first pump light;
one end of the first gain fiber is coupled with one end of the first wavelength division multiplexing unit and used for generating the first pulse laser according to the first pump light;
the first light splitting unit is coupled with the first gain optical fiber;
the first isolation unit is coupled with the first light splitting unit and the switching module respectively;
the filtering unit is coupled with the first light splitting unit;
the first annular unit is coupled with the first wavelength division multiplexing unit and the filtering unit respectively;
one end of the focusing unit is coupled with the first annular unit;
and an absorber mirror provided at the other end of the focusing unit.
6. The laser of claim 1, wherein the optical splitting module comprises:
the second light splitting unit is coupled with the second working cavity and is used for performing light splitting operation on the first pulse laser to generate second pulse laser and third pulse laser;
one end of the second isolation unit is coupled with the second light splitting unit;
and one end of the third light splitting unit is coupled with the other end of the second isolation unit, and the other end of the third light splitting unit is coupled with the power detection module and is used for performing light splitting operation on the third pulse laser to generate the detection laser and the output laser.
7. The laser of claim 6, wherein the amplification module comprises:
the second pumping source is respectively electrically connected with the control module and coupled with the second working cavity and is used for generating second pumping light; the second pump source is further configured to be turned on according to the first switching signal, and the second pump source is further configured to be turned off according to the second switching signal;
and the second working cavity is used for amplifying the second pulse laser according to the second pump light.
8. The laser of claim 7, wherein the second working cavity comprises:
one end of the second wavelength division multiplexing unit is coupled with the second pump source; the other end of the second wavelength division multiplexing unit is coupled with the switching module and used for receiving the second pumping light and the second pulse laser;
one end of the second gain fiber is coupled with one end of the second wavelength division multiplexing unit; the other end of the second gain optical fiber is coupled with one end of the second light splitting unit and is used for amplifying the second pulse laser;
the second grating is coupled with the switching module;
and the second annular unit is coupled and connected with the switching module, the other end of the second wavelength division multiplexing unit and the second light splitting unit respectively.
9. The laser of claim 7, wherein the second working cavity comprises:
one end of the second wavelength division multiplexing unit is coupled with the second pump source; the other end of the second wavelength division multiplexing unit is coupled with the switching module and used for receiving the second pumping light and the second pulse laser;
one end of the second gain fiber is coupled with one end of the second wavelength division multiplexing unit; the other end of the second gain optical fiber is coupled with one end of the second light splitting unit and is used for amplifying the second pulse laser;
the reflecting mirror is coupled with one end of the second light splitting unit;
and the second grating is coupled with the switching module.
10. A laser according to any of claims 1 to 9, wherein the coupling connection is a polarization maintaining fiber connection.
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| CN102368590A (en) * | 2011-11-29 | 2012-03-07 | 北京航空航天大学 | Control driving system of short pulse laser system |
| CN110661165A (en) * | 2019-11-11 | 2020-01-07 | 光越科技(深圳)有限公司 | SESAM mode locking method for multi-point position automatic switching and optical fiber laser thereof |
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| US6922423B2 (en) * | 2003-04-11 | 2005-07-26 | Robert L. Thornton | Control system for a semiconductor laser |
| ES2710480T3 (en) * | 2007-12-18 | 2019-04-25 | Nkt Photonics As | Fiber laser blocked mode with improved life span saturable absorber |
| JP2009246345A (en) * | 2008-03-12 | 2009-10-22 | Komatsu Ltd | Laser system |
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| CN102368590A (en) * | 2011-11-29 | 2012-03-07 | 北京航空航天大学 | Control driving system of short pulse laser system |
| CN110661165A (en) * | 2019-11-11 | 2020-01-07 | 光越科技(深圳)有限公司 | SESAM mode locking method for multi-point position automatic switching and optical fiber laser thereof |
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