CN113889834A - Power self-optimization method of solid-state laser - Google Patents
Power self-optimization method of solid-state laser Download PDFInfo
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- CN113889834A CN113889834A CN202111151179.7A CN202111151179A CN113889834A CN 113889834 A CN113889834 A CN 113889834A CN 202111151179 A CN202111151179 A CN 202111151179A CN 113889834 A CN113889834 A CN 113889834A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The invention discloses a power self-optimization method of a solid-state laser, which relates to the technical field of solid-state lasers. The invention can realize the monitoring of each module parameter of the solid-state laser through the control system, realize the high-precision control and adjustment of parameters such as current, temperature, position and the like, ensure that each module works in the most effective state, realize the automatic optimization and adjustment of laser power and ensure the stability of light-emitting power; furthermore, the control system can also monitor the working state of the laser and autonomously detect the performance of the laser.
Description
Technical Field
The invention relates to the technical field of solid-state lasers, in particular to a power self-optimization method of a solid-state laser.
Background
The ultraviolet solid-state laser has great application value in the fields of optical measurement, atomic molecular physics, spectroscopy, nonlinear optics, laser medical treatment, laser radar, photoelectric countermeasure and the like, becomes a leading-edge subject in the research field of electro-optical devices at present, and the application of the ultraviolet laser is the part with the fastest growth of the industrial laser market at present from microlithography to marking and printing, which is attributed to the very mature full-solid-state ultraviolet laser technology and the unique advantages of short-wavelength laser in processing.
The ultraviolet solid-state laser needs to have stable power in the using process, and once the power fluctuates, the subsequent application is difficult. Performance parameters such as power stability and spot quality determine the prospect of laser application. In addition, if the laser power fluctuates, the root cause of the problem can be quickly checked and solved, which also affects the use of the solid-state laser.
Disclosure of Invention
The inventor provides a power self-optimization method of a solid-state laser aiming at the problems and the technical requirements, and the technical scheme of the invention is as follows:
a method of power self-optimization of a solid-state laser, comprising:
s1, the control system judges whether the pre-stored power meeting the expected power exists according to the expected power;
s2, if yes, the control system adjusts the current parameter combination of the solid laser to the pre-stored parameter combination corresponding to the pre-stored power; otherwise, the control system determines the pre-stored power closest to the expected power, and adjusts the current parameter combination of the solid-state laser to the pre-stored parameter combination corresponding to the closest pre-stored power;
s3, the control system judges whether the output power of the solid-state laser meets the expected power;
s4, if not, the control system coarsely adjusts the parameter combination of the solid laser to make the output power meet the expected power; otherwise, go directly to S5;
and S5, the control system finely adjusts the parameter combination of the solid-state laser to stabilize the output power of the solid-state laser.
Further, the solid-state laser comprises a power detector, a pumping source, an SESAM crystal and at least one frequency doubling crystal, wherein the parameter combination comprises current and temperature parameters of the pumping source, temperature and position parameters of the SESAM crystal, and temperature and position parameters of the at least one frequency doubling crystal; the power detector is used for detecting the output power and the fundamental frequency optical power of the solid-state laser.
Further, if the control system in S4 coarsely adjusts the parameter combination of the solid-state laser such that the output power does not satisfy the desired power, the method further includes:
and the control system carries out self-checking on the solid-state laser and outputs a self-checking result.
Further, the method for determining the combination of the pre-stored parameters comprises the following steps:
determining the pre-stored power, wherein the pre-stored power is not more than the maximum power which can be output by the solid-state laser;
on the basis of keeping other parameters unchanged, the control system adjusts the current and the temperature of the pumping source, records the fundamental frequency light power and the output power, and automatically records and stores the current parameter combination of the current and the temperature of the pumping source when the output power reaches the pre-stored power;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the temperature of the SESAM crystal and the temperature of the at least one frequency doubling crystal, finds out a corresponding temperature point when the output power reaches the pre-stored power, and automatically records and stores the temperature parameter combination of the SESAM crystal and the temperature parameter combination of the at least one frequency doubling crystal;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the up-down, left-right and front-back relative positions of the SESAM crystal and the at least one frequency doubling crystal, finds out a corresponding position point when the output power reaches the pre-stored power, and automatically records and stores the position parameter combination of the SESAM crystal and the position parameter combination of the at least one frequency doubling crystal.
Further, the control system carries out self-checking to the solid-state laser to output self-checking result, including:
the control system outputs a self-checking result based on the output power of the solid-state laser and the fundamental frequency optical power, wherein the self-checking result is used for indicating whether the output power, the fundamental frequency optical part and the frequency doubling part of the solid-state laser reach the standard or do not reach the standard.
Further, outputting a self-checking result based on the output power of the solid-state laser and the fundamental frequency optical power, comprising:
if the output power is lower than the set power, outputting a self-checking result for indicating that the output power of the solid-state laser does not reach the standard, and continuing the next detection; otherwise, ending the self-checking process;
if the fundamental frequency optical power is lower than the set fundamental frequency optical power, outputting a self-checking result for indicating that the fundamental frequency optical part of the solid-state laser does not reach the standard, and ending the self-checking process; otherwise, continuing the next detection;
calculating the frequency doubling efficiency by using the output power and the optical power of the fundamental frequency, and if the frequency doubling efficiency is reduced to exceed a first threshold, outputting a self-checking result for indicating that the frequency doubling part does not reach the standard and at least one frequency doubling crystal is damaged; and if the frequency doubling efficiency is reduced by more than a second threshold and is not more than a first threshold, outputting a self-checking result for indicating the performance reduction of at least one frequency doubling crystal.
The beneficial technical effects of the invention are as follows:
the application discloses a power self-optimization method of a solid-state laser, which can realize the monitoring of parameters of each module of the solid-state laser through a control system, realize the high-precision control and adjustment of parameters such as current, temperature, position and the like, ensure that each module works in the most effective state and realize the automatic optimization and adjustment of laser power; a user can set the working power of the laser by self, and the control system ensures the stability of the light emitting power by controlling the working conditions of each module; furthermore, the control system can also monitor the working state of the laser and autonomously detect the performance of the laser.
Drawings
Fig. 1 is a flow chart of a method for power self-optimization of a solid-state laser of the present application.
Fig. 2 is a schematic diagram of a solid-state laser structure with a control system according to the present application.
Detailed Description
The following further describes the embodiments of the present invention.
A method of power self-optimization of a solid-state laser, comprising:
s1, the control system judges whether the pre-stored power meeting the expected power exists according to the expected power.
S2, if yes, the control system adjusts the current parameter combination of the solid laser to the pre-stored parameter combination corresponding to the pre-stored power; otherwise, the control system determines the pre-stored power closest to the desired power and adjusts the current parameter combination of the solid-state laser to the pre-stored parameter combination corresponding to the closest pre-stored power.
Preferably, the method for determining the combination of the pre-stored parameters comprises:
determining the pre-stored power, wherein the pre-stored power is not more than the maximum power which can be output by the solid-state laser;
on the basis of keeping other parameters unchanged, the control system adjusts the current and the temperature of the pumping source, records the fundamental frequency light power and the output power, and automatically records and stores the current parameter combination of the current and the temperature of the pumping source when the output power reaches the pre-stored power;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the temperature of the SESAM crystal and the temperature of the at least one frequency doubling crystal, finds out a corresponding temperature point when the output power reaches the pre-stored power, and automatically records and stores the temperature parameter combination of the SESAM crystal and the temperature parameter combination of the at least one frequency doubling crystal;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the up-down, left-right and front-back relative positions of the SESAM crystal and the at least one frequency doubling crystal, finds out a corresponding position point when the output power reaches the pre-stored power, and automatically records and stores the position parameter combination of the SESAM crystal and the position parameter combination of the at least one frequency doubling crystal.
In one embodiment, when the optimal temperature point of the SESAM crystal or at least one frequency doubling crystal is determined, the temperature control temperature of the crystal is adjusted by taking a change curve of power and temperature as a judgment standard, the temperature can be controlled at 0.05 ℃ as one step, the laser output power is recorded at the same time, and finally the corresponding temperature point when the laser output power reaches the pre-stored power can be found; when the optimal position point of the SESAM crystal or the at least one frequency doubling crystal is determined, the upper and lower positions, the left and right positions and the front and back positions of the SESAM crystal or the at least one frequency doubling crystal are respectively adjusted, the relationship between the position change in different directions and the output laser power can be recorded by taking 0.1mm as a unit, the corresponding position point can be finally found when the laser output power reaches the pre-stored power, the optimal position point in a single direction is firstly found, and then the other direction is found.
S3, the control system determines whether the output power of the solid state laser meets the desired power.
S4, if not, the control system coarsely adjusts the parameter combination of the solid laser to make the output power meet the expected power; otherwise, proceed directly to S5.
And S5, the control system finely adjusts the parameter combination of the solid-state laser to stabilize the output power of the solid-state laser.
Specifically, the solid-state laser comprises a power detector, a pumping source, an SESAM crystal and at least one frequency doubling crystal, wherein the parameter combination comprises current and temperature parameters of the pumping source, temperature and position parameters of the SESAM crystal, and temperature and position parameters of the at least one frequency doubling crystal; the power detector is used for detecting the output power and the fundamental frequency optical power of the solid-state laser.
In the above steps S3, S5, and S6, the control system adjusts, coarsely adjusts, and finely adjusts the parameter combination of the solid-state laser by the same or similar method as that for determining the prestored parameter combination, that is, the control system respectively adjusts the current and temperature of the pump source, and adjusts the temperature and position of the SESAM crystal and the frequency doubling crystal to find the parameter combination meeting the output power requirement.
Preferably, if the control system in S5 coarsely adjusts the combination of parameters of the solid-state laser such that the output power does not satisfy the desired power, the method further comprises:
and the control system carries out self-checking on the solid-state laser and outputs a self-checking result.
Specifically, the self-checking process includes: the control system outputs a self-checking result based on the output power of the solid-state laser and the fundamental frequency optical power, wherein the self-checking result is used for indicating whether the output power, the fundamental frequency optical part and the frequency doubling part of the solid-state laser reach the standard or do not reach the standard.
Preferably, the self-checking result is output based on the output power of the solid-state laser and the fundamental frequency optical power, and comprises the following steps:
if the output power is lower than the set power, outputting a self-checking result for indicating that the output power of the solid-state laser does not reach the standard, and continuing the next detection; otherwise, ending the self-checking process;
if the fundamental frequency optical power is lower than the set fundamental frequency optical power, outputting a self-checking result for indicating that the fundamental frequency optical part of the solid-state laser does not reach the standard, and ending the self-checking process; otherwise, continuing the next detection;
calculating the frequency doubling efficiency by using the output power and the optical power of the fundamental frequency, and if the frequency doubling efficiency is reduced to exceed a first threshold, outputting a self-checking result for indicating that the frequency doubling part does not reach the standard and at least one frequency doubling crystal is damaged; and if the frequency doubling efficiency is reduced by more than a second threshold and is not more than a first threshold, outputting a self-checking result for indicating the performance reduction of at least one frequency doubling crystal.
In one embodiment, the set power may be 95% of the factory power of the power detector; the first threshold value is 25% of the factory frequency doubling efficiency of the power detector; the second threshold is 10% of the factory frequency doubling efficiency of the power detector.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (6)
1. A method for power self-optimization of a solid-state laser, comprising:
s1, the control system judges whether the pre-stored power meeting the expected power exists according to the expected power;
s2, if yes, the control system adjusts the current parameter combination of the solid-state laser to a prestored parameter combination corresponding to the prestored power; otherwise, the control system determines the pre-stored power closest to the expected power, and adjusts the current parameter combination of the solid-state laser to the pre-stored parameter combination corresponding to the closest pre-stored power;
s3, the control system judges whether the output power of the solid-state laser meets the expected power;
s4, if not, the control system coarsely adjusts the parameter combination of the solid-state laser so that the output power satisfies the desired power; otherwise, go directly to S5;
and S5, the control system finely adjusts the parameter combination of the solid-state laser to stabilize the output power of the solid-state laser.
2. The method of claim 1, wherein the solid state laser comprises a power detector, a pump source, a SESAM crystal, and at least one frequency doubling crystal, wherein the combination of parameters comprises a current of the pump source, a temperature parameter of the SESAM crystal, a position parameter of the at least one frequency doubling crystal; the power detector is used for detecting the output power and the fundamental frequency optical power of the solid-state laser.
3. The method of claim 2, wherein if the control system in S4 coarsely adjusts the combination of parameters of the solid-state laser such that the output power meets the desired power, the method further comprises:
and the control system carries out self-checking on the solid-state laser and outputs a self-checking result.
4. The method of claim 2, wherein the pre-stored parameter combination is determined by:
determining prestored power, wherein the prestored power is not greater than the maximum power which can be output by the solid-state laser;
on the basis of keeping other parameters unchanged, the control system adjusts the current and the temperature of the pumping source, records the fundamental frequency light power and the output power, and automatically records and stores the current parameter combination of the current and the temperature of the pumping source when the output power reaches the pre-stored power;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the temperature of the SESAM crystal and the temperature of the at least one frequency doubling crystal, finds out a corresponding temperature point when the output power reaches the pre-stored power, and automatically records and stores the temperature parameter combination of the SESAM crystal and the temperature parameter combination of the at least one frequency doubling crystal;
on the basis of keeping other parameters unchanged, the control system respectively adjusts the up-down, left-right, front-back relative positions of the SESAM crystal and the at least one frequency doubling crystal, finds out the corresponding position point when the output power reaches the pre-stored power, and automatically records and stores the position parameter combination of the SESAM crystal and the position parameter combination of the at least one frequency doubling crystal.
5. A method according to claim 3, wherein the control system performs a self-test on the solid-state laser and outputs a self-test result, comprising:
and the control system outputs the self-checking result based on the output power and the fundamental frequency optical power of the solid-state laser, wherein the self-checking result is used for indicating that the output power, the fundamental frequency optical part and the frequency doubling part of the solid-state laser meet or do not meet the standard.
6. The method of claim 5, wherein outputting the self-test result based on the output power of the solid-state laser and the fundamental optical power comprises:
if the output power is lower than the set power, outputting a self-checking result for indicating that the output power of the solid-state laser does not reach the standard, and continuing the next detection; otherwise, ending the self-checking process;
if the fundamental frequency optical power is lower than the set fundamental frequency optical power, outputting a self-checking result for indicating that the fundamental frequency optical part of the solid-state laser does not reach the standard, and ending the self-checking process; otherwise, continuing the next detection;
calculating frequency doubling efficiency by using the output power and the optical power of the fundamental frequency, and if the frequency doubling efficiency is reduced to exceed a first threshold value, outputting a self-checking result for indicating that a frequency doubling part does not reach the standard and at least one frequency doubling crystal is damaged; and if the frequency doubling efficiency is reduced by more than a second threshold and is not more than a first threshold, outputting a self-checking result for indicating the performance reduction of at least one frequency doubling crystal.
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| CN114465083A (en) * | 2022-01-29 | 2022-05-10 | 昕锐至成(江苏)光电科技有限公司 | Laser stability control method and system |
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