CN117039599A - Frequency multiplication laser generation method and system - Google Patents

Frequency multiplication laser generation method and system Download PDF

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Publication number
CN117039599A
CN117039599A CN202310796166.8A CN202310796166A CN117039599A CN 117039599 A CN117039599 A CN 117039599A CN 202310796166 A CN202310796166 A CN 202310796166A CN 117039599 A CN117039599 A CN 117039599A
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laser
frequency
signals
signal
lasers
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曾鑫
韩璐
程鑫
杨学宗
冯衍
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Hangzhou Institute of Advanced Studies of UCAS
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Hangzhou Institute of Advanced Studies of UCAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation
    • 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
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • 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
    • H01S3/10053—Phase control
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/0604—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising a non-linear region, e.g. generating harmonics of the laser frequency
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06233—Controlling other output parameters than intensity or frequency
    • H01S5/06246—Controlling other output parameters than intensity or frequency controlling the phase

Abstract

The invention discloses a high-efficiency frequency doubling laser generating method and a system, the laser spectrum is broadened based on cascaded four-wave mixing in the multi-wavelength common amplification process, so as to inhibit stimulated Brillouin scattering in the laser amplification process and improve the laser output power; meanwhile, the wavelength interval is optimized, the frequency multiplication conversion efficiency is improved through the multi-longitudinal mode enhancement effect in the single-pass frequency multiplication process, and the high-power multi-single-frequency multiplication laser output is realized. The invention has the advantages of flexible wavelength, simple and compact structure, low cost and the like, can effectively improve the frequency doubling laser conversion efficiency and the power limit of the output power laser technology, the method is favorable for improving the photoelectric efficiency of a laser system, provides a new technical scheme for high-power visible multi-single-frequency laser generation, and has important practical value.

Description

Frequency multiplication laser generation method and system
Technical Field
The invention relates to the technical field of lasers, in particular to a high-efficiency frequency doubling laser generation method and system, which are used for generating high-power frequency doubling laser with narrow line width.
Background
The infrared laser can effectively expand the wavelength range of the laser through a second-order nonlinear process, such as frequency multiplication, sum frequency, difference frequency, optical parametric oscillation and the like, and realize the laser output of visible light, ultraviolet, mid-infrared and other wavebands. Laser of visible and ultraviolet band is used in laser display, metal processing and quantum information technology the laser remote sensing and detection, medical imaging and treatment, cold atom and other fields have important application. The laser frequency doubling technology is to obtain high power visible light and ultraviolet laser. In practical application, high frequency multiplication conversion efficiency and high-power single-frequency laser output are realized, high-power single-frequency laser pumping is needed, and single-frequency laser power improvement is limited by various nonlinear effects, particularly stimulated brillouin scattering, so that visible light and ultraviolet laser power are limited, wherein the stimulated brillouin scattering is SBS for short.
The phase modulation technique is widely applied to the power boost of high-power single-frequency and narrow-linewidth fiber lasers due to a plurality of advantages. However, the multiple frequency components of the phase modulated laser have a fixed phase relationship, which results in lower output efficiency in the frequency doubling process, and cannot further effectively utilize the energy between the multiple frequency components, resulting in higher energy of the remaining fundamental frequency light, and also reduces the electro-optical conversion efficiency of the system. Therefore, how to inhibit SBS in the laser amplification process, and improve the power utilization rate of amplified laser at the same time, so as to realize efficient frequency doubling laser output with narrow linewidth is a problem to be solved in the art.
Disclosure of Invention
The invention provides a frequency multiplication laser generation method and system, which aim to solve the problem of low efficiency and output power in the frequency multiplication process caused by SBS (styrene butadiene styrene) inhibition by single-frequency laser phase modulation. The details are described below:
a method and system for generating frequency-doubled laser, the method comprising:
carrying out phase modulation on two or more narrow linewidth signal lasers by adopting any plurality of driving signals;
adjusting the wavelength interval between lasers to generate cascading FWM in the common amplification process, and optimizing the interval between the lasers to ensure that the laser linewidth of cascading FWM stretching is positioned in the wavelength receiving bandwidth of the nonlinear crystal;
and finally, two amplified signal lasers and FWM lasers pass through the nonlinear crystal at the same time, and frequency multiplication is carried out to obtain multi-single-frequency laser output.
A frequency doubled laser generating system, the system comprising: the two single-frequency lasers with the wavelength interval not more than 1nm, the signal generator, the first phase modulator, the second phase modulator, the frequency multiplication laser amplification system and the laser frequency multiplication device are arranged in a mode that the line width is smaller than 1GHz; and any two driving signals generated by the signal generator respectively drive the first phase modulator and the second phase modulator to carry out phase modulation on two single-frequency lasers, and the modulated lasers are subjected to beam combination, enter a laser amplification system to amplify and generate cascading FWM, and finally enter a laser frequency doubling device to output multiple single-frequency lasers.
The technical scheme provided by the invention has the beneficial effects that:
1. the invention expands the spectrum of the amplified laser by cascading FWM through common amplification of the specific dual-wavelength laser, inhibits SBS in the laser amplification process, and effectively improves the conversion efficiency and the output power in the frequency multiplication process. The photoelectric efficiency of the laser system is improved, and the energy consumption of the system is reduced.
2. The invention adopts common amplification, well utilizes the system structure, ensures that the cascade FWM generation mode is simpler and more efficient, can realize high-power laser output and avoids the complexity of the device;
3. the invention is suitable for amplifying and doubling any number of single-frequency lasers, has wide application range, has the characteristics of simple structure, high conversion efficiency, high output power, good stability, low cost and the like, and has important practical value and wide application prospect.
Drawings
FIG. 1 is a schematic diagram of a frequency doubling laser generating device according to the present invention;
FIG. 2 is a schematic diagram of a frequency doubling laser amplifying system according to the present invention;
FIG. 3 is a schematic diagram of a laser amplifier according to the present invention;
fig. 4 is a schematic structural diagram of a frequency multiplier according to the present invention.
Fig. 5 is a comparison of the output power and conversion efficiency of the dual-wavelength co-amplified laser frequency multiplication provided by the present invention with the frequency multiplication result achieved by the prior art scheme.
In the drawings, the list of components represented by the various numbers is as follows:
1: a first single frequency laser; 2: a second single frequency laser; 3: a signal generator; 4: a first phase modulator; 5: a second phase modulator; 10: a frequency multiplication laser amplification system; 11: and a laser frequency doubling device.
Wherein, 10: the frequency multiplication laser amplification system comprises, 6: a laser beam combining device; 7: a laser amplification system; 8: an isolator; 9: an optical lens group;
in the laser amplification system, 7.1 is a primary isolator, 7.2 is a primary amplifier, 7.3 is a secondary isolator, 7.4 is a secondary amplifier, 7.5 is a tertiary isolator, and 7.6 is a tertiary amplifier;
in the laser frequency doubling device, 11.1 is a frequency doubling crystal, 11.2 is a spectroscope, and 11.3 is a collimating lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
The implementation method of the frequency multiplication laser generation method of the embodiment of the invention is as follows:
carrying out phase modulation on two or more narrow linewidth signal lasers by adopting any plurality of driving signals;
after combining two or more than two phase modulated narrow linewidth signals, the two signals enter a laser amplifier for common amplification, and cascade four-wave mixing (FWM) broadened laser spectrum is generated to inhibit stimulated Brillouin scattering in the amplification process;
the intervals among the signal lasers are optimized to be positioned in the wavelength receiving bandwidth of the nonlinear crystal;
and finally, the amplified signal laser and FWM laser thereof are subjected to frequency multiplication through a nonlinear crystal at the same time, so that multi-single-frequency laser output is realized.
In the embodiment of the invention, at least two signals in any plurality of driving signals are adopted to carry out phase modulation on two signal lasers in a plurality of narrow linewidth lasers, wherein the narrow linewidth comprises single-frequency, few-frequency and multi-single-frequency lasers. The number of the single-frequency lasers and the driving signals is not less than 2, and the number of the driving signals is less than or equal to the number of the single-frequency lasers.
In the embodiment of the invention, the driving signal is a periodic sine, cosine, square wave, triangular wave, pulse or pseudo-random signal, the amplitude and frequency of the signal are adjustable, and the time delay or phase between partial signals is adjustable. The amplitude of the adjusting signal can change the phase modulation depth, and the frequency of the adjusting signal can change the spectrum width of the widened laser. In the phase modulation, the plurality of driving signals may be the same type or may be a combination of a plurality of signals. When the same driving signal is adopted, the amplitude of the adjusting signal changes the phase modulation depth, so that the modulation depths of a plurality of lasers can be equal or nearly equal.
The embodiment of the invention also provides a frequency multiplication laser generation system, which is realized as follows:
the two single-frequency lasers with the wavelength interval not more than 1nm, the signal generator, the first phase modulator, the second phase modulator, the frequency multiplication laser amplification system and the laser frequency multiplication device are arranged in a mode that the line width is smaller than 1GHz;
and any two driving signals generated by the signal generator respectively drive the first phase modulator and the second phase modulator to carry out phase modulation on two single-frequency lasers, and the modulated lasers are subjected to beam combination, enter a laser amplification system to amplify and generate cascading FWM, and finally enter a laser frequency doubling device to output multiple single-frequency lasers.
In an embodiment of the present invention, the frequency doubling laser amplification system includes: the device comprises a laser beam combining device, a laser amplifying system, an isolator and an optical lens group; the laser beam combining device is formed by combining one or more of a laser beam splitter, a coupler, a dichroic mirror, a polarization beam splitter, a laser beam combiner or a wavelength division multiplexer; and the optical lens group is a single lens or a plurality of lenses and is used for focusing or expanding the laser spots output by the amplifier.
One end of the laser beam combining device is commonly connected with the first phase modulator and the second phase modulator, the other end of the laser beam combining device is connected with the laser amplifying system, and laser output by the laser amplifying system passes through the isolator.
In the embodiment of the invention, the signal generator is a signal generator with adjustable signal amplitude, the peak value is not more than 100V and the bias is adjustable, and the frequency range of the signal generated by the signal generator is 0-10GHz or the code rate range is 0-10Gbps; the signal generator generates a plurality of signals, and the phase or time delay among the signals are mutually locked and adjusted;
the driving signal generated by the signal generator is selected from periodic signals or non-periodic arbitrary signals, and the periodic signals are selected from sine signals, cosine signals, triangular wave signals, square wave signals, pulse signals and pseudo-random code signals.
In the embodiment of the invention, the first phase modulator and the second phase modulator are electro-optic phase modulator with fiber tail or space electro-optic phase modulator, and the output amplitude, frequency or code rate of the signal generator is regulated to change the modulation depth of the phase modulation laser and widen the frequency interval of the laser; and adjusting the time delay between signals of the signal generator to change the phase difference between the phase modulation lasers.
In an embodiment of the present invention, the laser amplifying system includes: one or more stages of rare earth doped solid state amplifiers, solid state raman amplifiers, rare earth doped fiber optic amplifiers, fiber optic raman amplifiers.
In the embodiment of the invention, the laser frequency doubling device adopts a single-pass frequency doubling, cascading single-pass frequency doubling, double-pass or multi-pass frequency doubling and extracavity resonance frequency doubling structure; the crystal in the frequency doubling device is selected from the following materials: periodically poled lithium niobate, periodically poled magnesium doped lithium niobate, periodically poled stoichiometric lithium tantalate doped magnesium oxide, periodically poled potassium titanyl phosphate, potassium titanyl arsenate, periodically poled potassium titanyl arsenate, potassium dihydrogen phosphate, potassium dideuterium phosphate, barium beta-metaborate, lithium triborate, bismuth borate, lithium cesium borate.
The frequency multiplication laser generation system of the embodiment of the invention comprises: a first single-frequency laser 1, a second single-frequency laser 2, a signal generator 3, a first phase modulator 4, a second phase modulator 5, a difference-frequency laser amplification system 10, and a laser frequency doubling device 11.
The first single-frequency laser 1 and the second single-frequency laser 2 are respectively connected with a first phase modulator 4 and a second phase modulator 5, and the first phase modulator 4 and the second phase modulator 5 are connected with a frequency doubling laser amplifying system 10 and a laser frequency doubling device 11; the two signals generated by the signal generator 3 respectively drive the first phase modulator 4 and the second phase modulator 5, so that the signals passing through the first phase modulator 4 and the second phase modulator 5 are combined and amplified by the frequency doubling laser amplifying system 10 and finally enter the laser frequency doubling device 11, and a multi-single-frequency doubling laser output is obtained.
Wherein the frequency doubling laser amplification system 10 comprises: the laser beam combining device 6, the laser amplifying system 7, the isolator 8 and the optical lens group 9; the frequency doubling laser amplification system 10 is connected in the following manner: one end of the laser beam combining device 6 is commonly connected with the first phase modulator 4 and the second phase modulator 5, the other end of the laser beam combining device is connected with the laser amplifying system 7, and laser output by the laser amplifying system 7 sequentially passes through the isolator 8 and the optical lens group 9;
the first single-frequency laser 1 and the second single-frequency laser 2 can be rare earth doped solid lasers, solid raman lasers, gas lasers, distributed feedback DFB semiconductor lasers, external cavity semiconductor ECDL lasers, distributed feedback DFB fiber lasers or distributed bragg reflection DBR fiber lasers, or any combination of the above lasers, and the line widths of the generated single-frequency lasers are all smaller than 1GHz; the first single-frequency laser 1 and the second single-frequency laser 2 have a center wavelength interval of not more than 1nm.
The signal generator 3 signal is a periodic signal comprising: sine signals, cosine signals, triangular wave signals, square wave signals, pulse signals, etc., pseudo-random code signals, and other arbitrary signals.
The signal generator 3 can generate a plurality of signals, and the phase or time delay between the signals can be adjusted and locked with each other; the amplitude of the signal generated by the signal generator 3 is adjustable, the peak-to-peak value is not more than 100V, and the bias is adjustable; the frequency range of the signal generated by the signal generator 3 is 0-10GHz or the code rate is 0-10Gbps; the modulation depth of the phase modulation laser and the frequency interval of the phase modulation laser can be respectively changed by adjusting the output amplitude, frequency or code rate of the signal generator 3; the time delay of the signal generator 3 is adjusted to change the phase of the signal and the phase modulated laser. The first phase modulator 4 and the second phase modulator 5 are electro-optic phase modulators with fiber tails or space electro-optic phase modulators and are driven by the signal generator 3; the output ends of the first phase modulator 4 and the second phase modulator 5 are connected with a frequency multiplication laser amplification system 10. The laser beam combining device 6 is formed by combining one or more of a laser beam splitter, a coupler, a dichroic mirror, a polarization beam splitter, a laser beam combiner or a wavelength division multiplexer. The laser amplification system 7 includes: one or more stages of rare earth doped solid state amplifiers, solid state raman amplifiers, rare earth doped fiber optic amplifiers, fiber raman amplifiers, and the like. Wherein the optical lens group 9 is a single lens or a plurality of lens combinations, and is used for focusing or expanding a laser spot. The frequency doubling device 11 adopts a single-pass frequency doubling, cascade single-pass frequency doubling, double-pass or multiple-pass frequency doubling and extracavity resonance frequency doubling structure. The frequency doubling crystal of 11.1 in the frequency doubling device is selected as follows: periodically Poled Lithium Niobate (PPLN), periodically poled magnesium doped lithium niobate (MgO-PPLN), periodically poled stoichiometric lithium tantalate doped magnesium oxide (MgO-PPsLT), periodically poled potassium titanyl phosphate (PPKTP), potassium titanyl phosphate (KTP), potassium titanyl arsenate (KTA), periodically poled potassium titanyl arsenate (abbreviated PKTA), potassium dihydrogen phosphate (KDP), potassium dideuterium phosphate (KD x P), beta-barium metaborate (BBO), lithium triborate (LBO), bismuth borate (BIBO), lithium cesium borate (CLBO).
Example 1
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the method for generating the double-frequency laser adopts two sinusoidal signals, respectively carries out sinusoidal phase modulation on two single-frequency lasers with line width smaller than 10MHz and center wavelength interval of 0.05nm, so as to inhibit the SBS effect in the amplifying process, enables the two lasers after phase modulation to jointly enter a cascaded laser amplifier through laser beam combination, generates cascaded FWM through the amplifying process, further inhibits SBS, and enables the amplified lasers to pass through an isolator and then carry out single-pass double frequency, thereby obtaining high-power multiple single-frequency double-frequency laser.
The frequency multiplication laser generating system in the embodiment comprises a first single-frequency laser 1 which is a single-frequency distributed feedback semiconductor laser with a line width of 10MHz and a central wavelength of 1063nm; the second single frequency laser 2 is a single frequency distributed feedback DFB fiber laser with a linewidth of 2MHz, a center wavelength of 1063.05nm; the signal generator 3 employs a two-channel sinusoidal signal source, the output frequency was 100MHz and the peak-to-peak value was 10V. The output amplitude of the signal generator 3 is adjusted to 10V, and the LN first phase modulator 4 and the LN second phase modulator 5 with the bandwidths of 10GHz are driven respectively. The frequency doubling laser amplification system 10 is connected with: one end of the laser beam combining device 6 is commonly connected with the first phase modulator 4 and the second phase modulator 5, the other end of the laser beam combining device is connected with the laser amplifying system 7, and laser output by the laser amplifying system 7 sequentially passes through the isolator 8. The laser beam combining device 6 adopts 50: 50; the laser amplifying system 7 is a three-stage ytterbium-doped fiber laser amplifier, wherein 7.1 is a primary isolator, 7.2 is a primary ytterbium-doped fiber amplifier, 7.3 is a secondary isolator, 7.4 is a secondary ytterbium-doped fiber amplifier, 7.5 is a three-stage isolator, and 7.6 is a three-stage ytterbium-doped fiber amplifier, and n=2 at this time; the isolator 8 is a vertically polarized 500W spatial isolator; the optical lens group 9 is a 1063nm single focusing lens; the laser frequency doubling device 11 is of a single-pass frequency doubling structure, the frequency doubling crystal and the temperature control device 11.1 thereof are LBO crystals, the temperature control range is 50-300 ℃, the precision is +/-0.02 ℃, the 11.2 is a spectroscope, and the 11.3 is a collimating lens.
In the frequency multiplication laser generation system in this embodiment, the laser power amplified and output exceeds 300W, and the center wavelength of the output few-frequency laser is 531.512nm. Compared to the frequency multiplication output result of the prior art, as shown in fig. 5 (a), the output power and efficiency of the present embodiment are improved by about 1.5 times at the same amplified laser power, as shown in fig. 5 (b).
Example 2
As shown in fig. 1, 2, 3 and 4, the method for generating the double-frequency laser adopts two square wave signals, and carries out phase modulation on any two single-frequency lasers in three single-frequency lasers with line widths smaller than 1MHz respectively, and expands spectrums to inhibit the SBS effect in the amplifying process; the three single-frequency laser wavelength intervals are set to be 0.01nm, three laser seeds jointly enter a three-stage optical fiber Raman laser for amplification through beam combination, a cascading FWM stretching Raman laser spectrum is generated, SBS is further restrained, and amplified laser passes through cascading single-pass frequency multiplication, so that high-power multi-single-frequency visible laser is obtained.
A multiple frequency laser generating system in this embodiment, the laser comprises a first single-frequency laser 1, a second single-frequency external cavity semiconductor ECDL laser with a linewidth of 1MHz and a center wavelength of 1177.89nm; the second single-frequency laser 2 is a few-frequency laser with the spectral component linewidth of 0.2MHz and 0.1MHz formed by combining two single-frequency distributed feedback DFB fiber lasers, and the central wavelength is 1178nm and 1178.01nm respectively; the signal generator 3 adopts any wave signal source to generate two square wave signals, the frequency is 50MHz, the output amplitude is 9V, and the MgO-doped SLT first phase modulator 4 and the MgO-doped SLT second phase modulator 5 are respectively driven. The frequency doubling laser amplification system 10 is connected with: one end of the laser beam combining device 6 is commonly connected with the first phase modulator 4 and the second phase modulator 5, the other end of the laser beam combining device is connected with the laser amplifying system 7, and laser output by the laser amplifying system 7 sequentially passes through the isolator 8. The laser beam combining device 6 adopts 50: 50. The laser amplification system 7 is a three-stage quartz fiber Raman laser amplifier, wherein 7.1 is a primary fiber isolator, 7.2 is a primary fiber Raman laser amplifier, 7.3 is a secondary fiber isolator, 7.4 is a secondary fiber Raman laser amplifier, 7.5 is a three-stage fiber isolator, and 7.6 is a three-stage fiber Raman laser amplifier, and N=2. The spacer 8 is a 1178nm spatial spacer. The laser frequency doubling device 11 is of a cascading single-pass frequency doubling structure, the optical lens group 9 is an optical focusing lens with the wavelength of 1178nm, the 11.1 comprises two frequency doubling KTP crystals, a focusing lens and a temperature control device, the 11.2 is a spectroscope, and the 11.3 is a collimating lens. In the frequency doubling laser generating system in this embodiment, the phase difference of two square wave signals is pi, and the output laser center wavelength is located near 589 nm.
The embodiment of the invention does not limit the types of other devices except the types of the devices, so long as the devices can complete the functions.
Those skilled in the art will appreciate that the drawings are schematic representations of only one preferred embodiment, and that the above-described embodiment numbers are merely for illustration purposes and do not represent advantages or disadvantages of the embodiments.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A method for generating frequency-doubled laser, characterized in that the method comprises the following steps:
carrying out phase modulation on two or more narrow linewidth signal lasers by adopting any plurality of driving signals;
after combining two or more than two phase modulated narrow linewidth signals, the two signals enter a laser amplifier for common amplification, and cascade four-wave mixing (FWM) broadened laser spectrum is generated to inhibit stimulated Brillouin scattering in the amplification process;
the intervals among the signal lasers are optimized to be positioned in the wavelength receiving bandwidth of the nonlinear crystal;
and finally, the amplified signal laser and FWM laser thereof are subjected to frequency multiplication through a nonlinear crystal at the same time, so that multi-single-frequency laser output is realized.
2. The method of generating a doubled laser beam according to claim 1, wherein at least two driving signals are used to phase modulate two signal lasers of the plurality of narrow linewidth lasers, wherein the narrow linewidth lasers include single frequency, few frequency and multiple single frequency lasers. The number of the narrow linewidth signal lasers and the driving signals is not less than 2, and the number of the driving signals is less than or equal to the number of the single-frequency lasers.
3. The method of claim 1, wherein the driving signal is a periodic sine, cosine, square wave, triangular wave, pulse or pseudo-random signal, the amplitude and frequency of the signal are adjustable, and the time delay or phase between the signals is adjustable. The amplitude of the adjusting signal can change the phase modulation depth, and the frequency of the adjusting signal can change the spectrum width of the widened laser.
4. A driving signal according to claim 3, characterized in that the plurality of driving signals may be of the same type or may be a combination of a plurality of signals when phase modulating is performed. When the same driving signal is adopted, the amplitude of the adjusting signal changes the phase modulation depth, so that the modulation depths of a plurality of lasers can be equal or nearly equal.
5. A frequency doubled laser generating system, the system comprising: the two line widths are less than 1GHz, a first single-frequency laser and a second single-frequency laser with a wavelength interval not more than 1nm, a signal generator, a first phase modulator, a second phase modulator, a frequency multiplication laser amplification system and a laser frequency multiplication device;
and any two driving signals generated by the signal generator respectively drive the first phase modulator and the second phase modulator to carry out phase modulation on two single-frequency lasers, and the modulated lasers are subjected to beam combination, enter a laser amplification system to amplify and generate cascading FWM, and finally enter a laser frequency doubling device to output multiple single-frequency lasers.
6. The frequency doubling laser generating system according to claim 5, the frequency multiplication laser amplification system is characterized by comprising: the device comprises a laser beam combining device, a laser amplifying system, an isolator and an optical lens group; the laser beam combining device is formed by combining one or more of a laser beam splitter, a coupler, a dichroic mirror, a polarization beam splitter, a laser beam combiner or a wavelength division multiplexer; and the optical lens group is a single lens or a plurality of lenses and is used for focusing or expanding the laser spots output by the amplifier.
One end of the laser beam combining device is commonly connected with the first phase modulator and the second phase modulator, the other end of the laser beam combining device is connected with the laser amplifying system, and laser output by the laser amplifying system passes through the isolator.
7. The frequency doubling laser generating system according to claim 5, wherein the signal generator is a signal generator with adjustable signal amplitude, peak value is not more than 100V and bias is adjustable, and the frequency range of the signal generated by the signal generator is 0-10GHz or the code rate range is 0-10Gbps; the signal generator generates a plurality of signals, and the phase or time delay between the signals can be mutually locked and adjusted;
the driving signal generated by the signal generator is selected from periodic signals or non-periodic arbitrary signals, and the periodic signals are selected from sine signals, cosine signals, triangular wave signals, square wave signals, pulse signals and pseudo-random code signals.
8. The system of claim 5, wherein the first phase modulator and the second phase modulator are electro-optic phase modulators with fiber tails or space electro-optic phase modulators, and the output amplitude, frequency or code rate of the signal generator is adjusted to change the modulation depth of the phase modulated laser and the frequency interval of the broadened laser; and adjusting the time delay between signals of the signal generator to change the phase difference between the phase modulation lasers.
9. The frequency doubled laser generating system of claim 5, wherein said laser amplification system comprises: one or more stages of rare earth doped solid state amplifiers, solid state raman amplifiers, rare earth doped fiber optic amplifiers, fiber optic raman amplifiers.
10. The frequency doubling laser generating system according to claim 5, wherein the laser frequency doubling device adopts a single-pass frequency doubling, cascade single-pass frequency doubling, double-pass or multiple-pass frequency doubling, and extracavity resonance frequency doubling structure; the crystal in the frequency doubling device is selected from the following materials: periodically poled lithium niobate, periodically poled magnesium doped lithium niobate, periodically poled stoichiometric lithium tantalate doped magnesium oxide, periodically poled potassium titanyl phosphate, potassium titanyl arsenate, periodically poled potassium titanyl arsenate, potassium dihydrogen phosphate, potassium dideuterium phosphate, barium beta-metaborate, lithium triborate, bismuth borate, lithium cesium borate.
CN202310796166.8A 2023-06-30 2023-06-30 Frequency multiplication laser generation method and system Pending CN117039599A (en)

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