CN115799960A

CN115799960A - Thermal compensation method and device for pulse pumping laser, laser and electronic equipment

Info

Publication number: CN115799960A
Application number: CN202211381808.XA
Authority: CN
Inventors: 金凤文; 张放
Original assignee: Beamtech Optronics Co ltd
Current assignee: Beamtech Optronics Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-03-14

Abstract

The present disclosure relates to a thermal compensation method and apparatus for a pulse pumped laser, a laser, and an electronic device, wherein a laser gain medium, a pumping source, and a resonant cavity are included in a light path of the pulse pumped laser, and the method includes: and providing a working pulse signal to the pumping source, wherein the pumping source emits pumping light, and the laser gain medium is excited by the pumping light to emit light in all directions, so that the resonant cavity outputs laser, wherein the working pulse signal comprises a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are arranged among the main pulses, and the working frequency corresponding to the main pulses is less than or equal to the maximum working frequency of the pulse pumping laser. The embodiment of the disclosure can perform pump thermal compensation on all frequencies within the maximum working frequency, so that the heat generated by each working frequency at the laser gain medium is consistent with the heat generated by the maximum working frequency at the laser gain medium.

Description

Thermal compensation method and device of pulse pump laser, laser and electronic equipment

Technical Field

The present disclosure relates to the field of laser application technologies, and in particular, to a thermal compensation method and apparatus for a pulse pumped laser, a laser, and an electronic device.

Background

With the rapid development of laser technology, the application of lasers is more and more extensive, and the requirements on the performance diversity, reliability and operation convenience of lasers are higher and higher. The pulse pump laser is more and more widely applied due to the advantages of long service life, selectable time-sharing light splitting, stability and the like, however, in the design of the pulse pump laser, a situation exists that heat generated on a gain medium is different when pumping is carried out at different frequencies, so that the resonant cavity parameters are also changed along with the change of the pumping frequency, and the energy and light spots of light emitted at different frequencies are different.

Disclosure of Invention

According to an aspect of the present disclosure, there is provided a method for thermal compensation of a pulse pumped laser, the optical path of the pulse pumped laser including a laser gain medium, a pump source, and a resonant cavity, the method including:

providing a working pulse signal to the pump source, the pump source emitting pump light, the laser gain medium being excited by the pump light to emit light in all directions, so that the resonant cavity outputs laser light,

the working pulse signal comprises a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are arranged among the main pulses, and the working frequency corresponding to the main pulses is less than or equal to the maximum working frequency of the pulse pump laser.

In a possible implementation manner, at least two compensation pulses of the first type are included between any two main pulses, and an interval between any two compensation pulses of the first type is smaller than an interval between any two main pulses, and a pulse width and a pulse intensity of each compensation pulse of the first type are respectively smaller than a pulse width and a pulse intensity of the main pulse.

In one possible embodiment, the method further comprises:

and adjusting at least one of the number, pulse interval, pulse width and pulse intensity of the first type compensation pulse between any two main pulses so that the heat generated by the laser gain medium at the current working frequency reaches or approaches the heat generated by the laser gain medium at the maximum working frequency of the pump laser.

In one possible embodiment, the frequency of the first type compensation pulse is 3 to 7 times the frequency of the main pulse, and the pulse intensity of the first type compensation pulse is 30 to 90% of the pulse intensity of the main pulse.

In a possible embodiment, one compensation pulse of the second type is included between any two main pulses, and the pulse width of the compensation pulse of the second type is smaller than the interval between the two main pulses at the maximum operating frequency of the pulsed pump laser.

In one possible embodiment, the method further comprises:

and adjusting the pulse width of the second type compensation pulse to enable the heat generated by the laser gain medium at the current working frequency to reach or approach the heat generated by the laser gain medium at the maximum working frequency of the pump laser.

According to an aspect of the present disclosure, there is provided a thermal compensation apparatus for a pulse pumped laser, the optical path of the pulse pumped laser including a laser gain medium, a pumping source, and a resonant cavity, the apparatus including:

a compensation module for providing a working pulse signal to the pump source, the pump source emitting pump light, the laser gain medium being excited by the pump light to emit light in each direction, so that the resonant cavity outputs laser light,

the working pulse signal comprises a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are arranged among the main pulses, and the working frequency corresponding to the main pulses is less than or equal to the maximum working frequency of the pulse pumping laser.

According to an aspect of the present disclosure, there is provided a pulsed pump laser including a thermal compensation device of the pulsed pump laser.

According to an aspect of the present disclosure, there is provided an electronic device including a thermal compensation device of the pulse pump laser, or the pulse pump laser.

In various aspects of the embodiments of the present disclosure, a laser gain medium, a pump source, a resonant cavity are included on an optical path of the pulse pump laser, and by providing a working pulse signal to the pump source, the pump source emits pump light, and the laser gain medium is excited by the pump light to emit light in various directions, so that the resonant cavity outputs laser light, where the working pulse signal includes a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are disposed between the main pulses, and a working frequency corresponding to the main pulses is less than or equal to a maximum working frequency of the pulse pump laser.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 shows a flow chart of a method of thermal compensation of a pulsed pump laser according to an embodiment of the present disclosure.

Fig. 2 and 3 show pulse waveform diagrams at various operating frequencies according to embodiments of the present disclosure.

Fig. 4 shows a flow chart of a method of thermal compensation of a pulsed pump laser according to an embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of a pulsed pump laser structure according to an embodiment of the present disclosure.

Fig. 6 shows a block diagram of a thermal compensation arrangement for a pulsed pump laser according to an embodiment of the disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In the description of the present disclosure, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be taken as limiting the present disclosure.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of a, B, and C, and may mean including any one or more elements selected from the group consisting of a, B, and C.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

For the pump heat change caused by the frequency change, a currently common related technology is frequency division work, for example, 100Hz pumping, frequency division can be performed to divide frequencies of 1, 5, 10, 20, 25, 50, etc. to perform Q modulation output laser, or Q modulation is performed at intervals of a fixed number of pump pulses, for example, Q modulation is performed at intervals of 1, Q modulation is performed at intervals of 2, and Q modulation can be performed at intervals of 30 in turn. The Q-switching is a method for instantly releasing energy stored in an activation medium by changing the Q value of an optical resonant cavity to obtain laser strong radiation with a certain pulse width (several to tens of nanoseconds), wherein the Q value is an index for evaluating the quality of the optical resonant cavity in a laser and is a quality factor.

However, the related art method of using the divided tone Q for thermal compensation has the following disadvantages: first, the related art can only achieve downward consideration of several specific frequencies, and cannot continuously adjust the frequencies; secondly, for the pumping mode with 20-30% of the conversion efficiency of the diode pumping laser, the pumping pulse without Q adjustment can generate heat accumulation, so that the thermal effect of the gain medium in the resonant cavity is large, and the thermal effect and the highest frequency difference can not be ensured to be small.

The embodiment of the disclosure provides a thermal compensation method for a pulse pumped laser, where an optical path of the pulse pumped laser includes a laser gain medium, a pumping source, and a resonant cavity, and a working pulse signal is provided to the pumping source, the pumping source emits pumping light, and the laser gain medium is excited by the pumping light to emit light in each direction, so that the resonant cavity outputs laser light, where the working pulse signal includes a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are disposed between the main pulses, and a working frequency corresponding to the main pulses is less than or equal to a maximum working frequency of the pulse pumped laser.

Referring to fig. 1, fig. 1 is a flow chart illustrating a method for thermal compensation of a pulsed pump laser according to an embodiment of the present disclosure.

The optical path of the pulse pumping laser comprises a laser gain medium, a pumping source and a resonant cavity, as shown in fig. 1, the method comprises:

step S11, providing a working pulse signal to the pumping source, wherein the pumping source emits pumping light, the laser gain medium is excited by the pumping light to emit light in all directions, so that the resonant cavity outputs laser,

The embodiment of the present disclosure does not limit the specific implementation manner of the pulse pump laser, and the thermal compensation method of the pulse pump laser of the embodiment of the present disclosure is applicable to various types of pulse pump lasers, and as long as the optical path of the pulse pump laser includes the laser gain medium, the pump source, and the resonant cavity, the embodiment of the present disclosure can perform thermal compensation on heat generated at the laser gain medium by each working frequency.

Referring to fig. 2 and 3, fig. 2 and 3 show pulse waveforms at various operating frequencies according to embodiments of the disclosure.

In one example, as shown in fig. 2, the first operating frequency and the second operating frequency are both smaller than the maximum operating frequency, and the second operating frequency is smaller than the first operating frequency, that is, the intervals of the main pulses (P1, P2) corresponding to the first operating frequency and the second operating frequency are both greater than the interval of the main pulse P0 corresponding to the maximum operating frequency, and the interval of the main pulse P1 corresponding to the first operating frequency is smaller than the interval of the main pulse P2 corresponding to the second operating frequency. For example, when the heating of the laser gain medium at the first operating frequency is compensated thermally, two first-type compensation pulses P11 may be added between each main pulse P1, an interval between two first-type compensation pulses P11 is smaller than an interval between any two main pulses P1, and a pulse width and a pulse intensity of each first-type compensation pulse P11 are respectively smaller than a pulse width and a pulse intensity of the main pulse P1. For example, when the heating of the laser gain medium at the second operating frequency is compensated thermally, 6 first-type compensation pulses P21 may be added between the main pulses P2, an interval between any two first-type compensation pulses P21 is smaller than an interval between any two main pulses P2, and a pulse width and a pulse intensity of each first-type compensation pulse P21 are respectively smaller than a pulse width and a pulse intensity of the main pulse P2. Of course, the number of the first type compensation pulses is described as an example, and the specific number of the first type compensation pulses is not limited in the embodiments of the present disclosure, and can be set by a person skilled in the art according to actual emptying and needs.

In one example, as shown in fig. 3, when the heating of the laser gain medium at the first operating frequency is compensated thermally, 1 second-type compensation pulse P12 may be added between each main pulse P1, and the pulse width of the second-type compensation pulse P12 is smaller than the interval between two main pulses P0 at the maximum operating frequency of the pulse pump laser. For example, when the heating of the laser gain medium at the second operating frequency is compensated thermally, 1 second-type compensation pulse P22 may be added between each main pulse P2, and the pulse width of the second-type compensation pulse P22 is smaller than the interval between two main pulses P0 at the maximum operating frequency of the pulse pump laser.

Referring to fig. 4, fig. 4 is a flow chart illustrating a method for thermal compensation of a pulsed pump laser according to an embodiment of the present disclosure.

In one possible embodiment, as shown in fig. 4, the method may further include:

and S13, adjusting at least one of the number, pulse interval, pulse width and pulse intensity of the first type compensation pulse between any two main pulses, so that the heat generated by the laser gain medium under the current working frequency reaches or approaches to the heat generated by the laser gain medium under the maximum working frequency of the pump laser.

The "heat generated by the laser gain medium at the maximum operating frequency close to the pump laser" in the embodiment of the present disclosure may be within a preset range of "heat generated by the laser gain medium at the maximum operating frequency of the pump laser", where the preset range may be set according to an actual situation.

Of course, the embodiment of the present disclosure may also adjust the time delay between the discharge time of the compensation pulse and the discharge time of the main pulse according to the actual situation and the need.

Illustratively, taking the adjustment of the number of the first type compensation pulses as an example, as shown in fig. 2, the number of the first type compensation pulses is inversely related to the operating frequency, and as the operating frequency decreases, the disclosed embodiment may correspondingly increase the number of the first type compensation pulses, so that the heat generated by the laser gain medium at the current operating frequency reaches or approaches the heat generated by the laser gain medium at the maximum operating frequency of the pump laser, for example, when the operating frequency decreases to the first operating frequency, the disclosed embodiment sets the number of the first type compensation pulses between two main pulses to be 2; when the operating frequency drops to the second operating frequency, the disclosed embodiments set the number of first type compensation pulses between two main pulses to 6.

Of course, besides adjusting the number of the first type compensation pulses, the embodiments of the present disclosure may also adjust parameters such as pulse intervals, pulse widths, and pulse intensities of the first type compensation pulses, which is not limited in the embodiments of the present disclosure.

For example, if the operating frequency is 100Hz, the frequency of the first type compensation pulse may be 300 to 700Hz, preferably, 500Hz; the pulse intensity of the first type of compensation pulse is for example 60% of the pulse intensity of the main pulse.

In one possible embodiment, as shown in fig. 4, the method further comprises:

and S14, adjusting the pulse width of the second type compensation pulse to enable the heat generated by the laser gain medium under the current working frequency to reach or approach the heat generated by the laser gain medium under the maximum working frequency of the pump laser.

Illustratively, as shown in fig. 3, the pulse width of the second type compensation pulse is inversely related to the operating frequency, and as the operating frequency decreases, the pulse width of the second type compensation pulse gradually increases, for example, the pulse width of the second type compensation pulse corresponding to the operating frequency decreasing to the first operating frequency is smaller than the pulse width of the second type compensation pulse corresponding to the operating frequency decreasing to the second operating frequency, of course, the specific size of the pulse width of the second type compensation pulse at each operating frequency is not limited by the embodiment of the present disclosure, and can be set by those skilled in the art according to actual circumstances and needs.

The embodiment of the present disclosure does not limit the specific implementation manner of providing the working pulse signal to the pump source in step S11, adjusting at least one of the number, the pulse interval, the pulse width and the pulse intensity of the first type compensation pulse between any two main pulses in step S13, and adjusting the pulse width of the second type compensation pulse in step S14, and for example, the embodiment of the present disclosure may generate the working pulse signal by controlling a power module of the laser through the control component, adjust at least one of the number, the pulse interval, the pulse width and the pulse intensity of the first type compensation pulse between any two main pulses or adjust the pulse width of the second type compensation pulse, and the power module may include a pulse width modulation PWM unit, and generate the working pulse signal by the PWM unit, adjust at least one of the number, the pulse interval, the pulse width and the pulse intensity of the first type compensation pulse between any two main pulses, or adjust the pulse width of the second type compensation pulse.

Illustratively, the control component may be integrated into the laser, for example, in the power module, or may be external to the laser, or may be a separate component in the laser, and in one example, the control component includes, but is not limited to, a separate processor, or discrete components, or a combination of a processor and discrete components. The processor may comprise a controller in an electronic device having functionality to execute instructions, which may be implemented in any suitable manner, e.g., by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components. Within the processor, the executable instructions may be executed by hardware circuits such as logic gates, switches, application Specific Integrated Circuits (ASICs), programmable logic controllers, and embedded microcontrollers. For example, the control component may send executable instructions to the power module, such that the power module performs step S11 to provide a working pulse signal to the pump source, step S13 to adjust at least one of the number, pulse interval, pulse width, and pulse intensity of the first type compensation pulse between any two main pulses, and step S14 to adjust the pulse width of the second type compensation pulse, so as to perform pump thermal compensation on each working frequency, such that the heat generated at the laser gain medium at each working frequency is consistent with the heat generated at the laser gain medium at the maximum working frequency.

Of course, the embodiments of the present disclosure are not limited thereto, and in another embodiment, the above executable instructions may be stored in a non-volatile storage component, and the executable instructions are solidified in a power supply module through the storage component, and when the laser is turned on, the power supply module directly calls the executable instructions in the storage component to provide a working pulse signal to the pump source, adjust at least one of the number of the first type compensation pulses between any two main pulses, the pulse interval, the pulse width, and the pulse intensity, and adjust the pulse width of the second type compensation pulses, so as to perform pump thermal compensation on each working frequency, so that the heat generated at the laser gain medium at each working frequency is consistent with the heat generated at the laser gain medium at the maximum working frequency, wherein the storage component may include a computer-readable storage medium, and the computer-readable storage medium may be a tangible device that can hold and store the instructions used by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a programmable read-only memory (PROM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical encoding device, a punch card or in-groove projection arrangement such as those on which instructions are stored, and any suitable combination of the foregoing.

A possible implementation of a pulsed pump laser is exemplarily described below.

Referring to fig. 5, fig. 5 is a schematic diagram of a pulsed pump laser according to an embodiment of the disclosure.

Illustratively, as shown in fig. 5, the pulsed pump laser may include a laser gain medium 1, a pump source 2, and a resonant cavity 3, which are disposed on an optical path, where the laser gain medium 1 and the pump source 2 are arranged side by side in an arrangement direction, and the resonant cavity 3 includes a mirror 31 for reflecting a light beam propagating along the optical path. The embodiment of the present disclosure does not limit the specific implementation manner of the reflecting mirror 31, for example, the reflecting mirror 31 may be a total reflection mirror or a partial reflection mirror or other types of mirrors, and the following description will take the total reflection mirror as an example, and the total reflection mirror is used for reflecting the light beam propagating along the light path. Wherein, "optical path" may refer to a propagation path of a light beam in the laser, "optical axis" may refer to a central axis of the light beam, and "optical path" and "optical axis" may have the same extension direction.

Illustratively, as shown in fig. 5, the pulse pump laser may further include a polarizer 4, a Q-switch 5, and a wave plate 6, although it should be understood that the polarizer 4, the Q-switch 5, and the wave plate 6 are not required.

Illustratively, the shape of the laser gain medium 1 may be a rod-like, plate-like, disk-like, or tubular solid, and the material thereof may be ytterbium-doped yttrium aluminum garnet (Yb: YAG) crystal, neodymium-doped yttrium aluminum garnet (Nd: YAG) crystal, or the like, and as shown in fig. 5, the laser gain medium may be arranged coaxially with the optical axis a of the light beam so that the light beam can pass through the laser gain medium 1 along the central axis of the laser gain medium 1. Wherein the element being arranged coaxially with the "optical axis" means that the element is arranged coaxially with at least a part of the "optical axis".

Illustratively, as shown in fig. 5, the pump source 2 may include a first pump source 21 and a second pump source 22. Specifically, the first pump source 21 and the second pump source 22 may be in the shape of a rod light source, a plate light source, a disk light source, a tube light source, or a matrix light source, and the light source type may be, for example, a xenon lamp, a krypton lamp, a laser diode, or the like. In one example, the first pump source 21, the second pump source 22, and the laser gain medium 1 may be arranged in parallel to each other, and for example, the first pump source 21 and the second pump source 22 may be arranged symmetrically with respect to the optical axis a. Of course, the specific number of the pump sources 2 is not limited in the embodiments of the present disclosure, in other embodiments, the pump sources may include only the first pump source 21 or the second pump source 22, that is, the number is 1, and in addition to the first pump source 21 and the second pump source 22, other pump sources, that is, the number is greater than 2, may also be included.

Illustratively, as shown in fig. 5, the resonator 3 may include a total reflection mirror 31 and an output mirror 32. The output mirror 32 may be a partially reflective mirror, which may be arranged coaxially with the optical axis a.

Illustratively, as shown in fig. 5, the polarizer 4, the Q-switch 5 and the wave plate 6 may be located between the all-mirror 31 and the laser gain medium 1, and the optical axis a may pass through the polarizer 4, the Q-switch 5 and the wave plate 6 in order from the laser gain medium 1 to the all-mirror 31 (the wave plate 6 is not necessary). The polarizer 4 may be a polarizer or a polarizing prism, etc. in one example, the Q-switch 5 may be an electro-optic crystal in one example. In one example, the wave plate 6 may be a half-wave plate, a quarter-wave plate or the like, and the fast axis or the slow axis of the wave plate 6 may be parallel to the polarization direction of the polarizer 4, although the arrangement of the wave plate 6 and the Q-switch 5 is not limited to the arrangement shown in the above embodiment, for example, the position of the wave plate 6 may be reversed with that of the Q-switch 5.

The working principle of the laser is described below.

In one example, as shown in fig. 5, the pump source 2 may emit pump light and irradiate the laser gain medium 1, and the laser gain medium 1 may be excited by the pump light to realize population inversion. Some of the high-energy state particles may generate spontaneous emission, so that the laser gain medium 1 emits light in all directions. Wherein light propagating in the direction of the optical axis a can be reflected back and forth between the holophote 31 and the output mirror 32 to form a parallel beam, while light propagating in other directions can be dissipated in the resonator 3. During the process of the back and forth reflection of the light beam, a part of photons in the light beam can meet with the high-energy-state particles in the laser gain medium 1, so that the high-energy-state particles generate stimulated radiation, and thus optical energy feedback is realized. Another portion of the photons in the beam may pass through an output mirror 32 to be output by the laser.

The energy storage density distribution of the laser gain medium 1 is related to the arrangement direction determined by the laser gain medium 1 and the pump source 2. Specifically, the portion of the laser gain medium 1 close to the pump source 2 generally has a larger inversion population density, and the portion far from the pump source 2 generally has a smaller inversion population density. Accordingly, the portion of the laser gain medium 1 having a larger population density of inversion has a larger energy storage density, so that the light emitted from this portion forms the higher energy portion of the beam. The portion of the laser gain medium 1 having the smaller inverse population density has a smaller storage density so that the light emitted by this portion forms the lower energy portion of the beam.

Of course, it should be emphasized that the above description of the pulse pump laser is exemplary and should not be considered as a limitation to the embodiments of the present disclosure, in other embodiments, the pulse pump laser may also include other components or have other structures, as long as it is satisfied that the optical path of the pulse pump laser includes a laser gain medium, a pump source, and a resonant cavity, the embodiments of the present disclosure may provide a working pulse signal to the pump source, so that the pump source emits pump light, and the laser gain medium is excited by the pump light to implement population inversion to emit light in all directions, so that the resonant cavity outputs laser light, and pumping thermal compensation may be performed for all frequencies within the maximum working frequency, so that heat generated at the laser gain medium by each working frequency is consistent with heat generated at the laser gain medium by the maximum working frequency.

Referring to fig. 6, fig. 6 shows a block diagram of a thermal compensation device of a pulsed pump laser according to an embodiment of the present disclosure.

Wherein, the optical path of the pulse pumping laser 200 includes a laser gain medium 1, a pumping source 2, and a resonant cavity 3, as shown in fig. 6, the apparatus 100 includes:

a compensation module 10, configured to provide a working pulse signal to the pump source, where the pump source emits pump light, and the laser gain medium is excited by the pump light to emit light in all directions, so that the resonant cavity outputs laser light,

The embodiment of the disclosure provides a thermal compensation device of a pulse pumped laser, where a light path of the pulse pumped laser includes a laser gain medium, a pumping source, and a resonant cavity, and a compensation module provides a working pulse signal to the pumping source, where the pumping source emits pumping light, and the laser gain medium is excited by the pumping light to emit light in each direction, so that the resonant cavity outputs laser light, where the working pulse signal includes a plurality of main pulses and a plurality of compensation pulses, the compensation pulses are set between the main pulses, and a working frequency corresponding to the main pulses is less than or equal to a maximum working frequency of the pulse pumped laser.

The embodiment of the present disclosure does not limit the specific implementation manner of the compensation module 10, for example, the compensation module 10 may include the aforementioned control component and a power supply module, and the control component may send an executable instruction to the power supply module, so that the power supply module performs providing a working pulse signal to the pump source, adjusting at least one of the number, pulse interval, pulse width, and pulse intensity of the first type compensation pulse between any two main pulses, and adjusting the pulse width of the second type compensation pulse, thereby performing pump thermal compensation on each working frequency, so that the heat generated at the laser gain medium by each working frequency is consistent with the heat generated at the laser gain medium by the maximum working frequency.

In a possible implementation, the compensation module may further include:

and the first adjusting unit is used for adjusting at least one of the number, the pulse interval, the pulse width and the pulse intensity of the first type compensation pulse between any two main pulses, so that the heat generated by the laser gain medium at the current working frequency reaches or approaches to the heat generated by the laser gain medium at the maximum working frequency of the pump laser.

In a possible implementation, the compensation module may further include:

and the second adjusting unit is used for adjusting the pulse width of the second type of compensation pulse, so that the heat generated by the laser gain medium at the current working frequency reaches or approaches to the heat generated by the laser gain medium at the maximum working frequency of the pump laser.

It should be noted that the thermal compensation apparatus of the pulse pump laser corresponds to the thermal compensation method of the pulse pump laser, and for a specific introduction, reference is made to the description of the thermal compensation method of the pulse pump laser, which is not repeated herein.

According to an aspect of the present disclosure, there is provided an electronic device comprising a thermal compensation device of the pulse pump laser, or the pulse pump laser.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A thermal compensation method for a pulse pump laser, wherein a laser gain medium, a pump source and a resonant cavity are included in an optical path of the pulse pump laser, and the method comprises:

2. The method of claim 1, wherein at least two compensation pulses of a first type are included between any two main pulses, and the interval between any two compensation pulses of the first type is smaller than the interval between any two main pulses, and the pulse width and the pulse intensity of each compensation pulse of the first type are smaller than the pulse width and the pulse intensity of the main pulse, respectively.

3. The method of thermal compensation of claim 2, further comprising:

adjusting at least one of a number, a pulse interval, a pulse width, and a pulse intensity of the first type compensation pulse between any two main pulses so that the heat generated by the laser gain medium at the current operating frequency reaches or approaches the heat generated by the laser gain medium at the maximum operating frequency of the pump laser.

4. The thermal compensation method according to claim 2, wherein the frequency of the first type compensation pulse is 3 to 7 times the frequency of the main pulse, and the pulse intensity of the first type compensation pulse is 30 to 90% of the pulse intensity of the main pulse.

5. The method of claim 1, wherein a second type compensation pulse is included between any two main pulses, and the pulse width of the second type compensation pulse is less than the interval between two main pulses at the maximum operating frequency of the pulsed pump laser.

6. The method of thermal compensation of claim 5, further comprising:

7. A thermal compensation device of a pulse pump laser, wherein a laser gain medium, a pump source and a resonant cavity are arranged on an optical path of the pulse pump laser, and the device comprises:

8. A pulsed pump laser, characterized in that it comprises thermal compensation means of the pulsed pump laser of claim 7.

9. An electronic device comprising a thermal compensation device of a pulsed pump laser according to claim 7, or a pulsed pump laser according to claim 8.