CN206498081U - A kind of tunable ultrashort pulse Fiber-optic parameter oscillator - Google Patents
A kind of tunable ultrashort pulse Fiber-optic parameter oscillator Download PDFInfo
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- CN206498081U CN206498081U CN201720164584.5U CN201720164584U CN206498081U CN 206498081 U CN206498081 U CN 206498081U CN 201720164584 U CN201720164584 U CN 201720164584U CN 206498081 U CN206498081 U CN 206498081U
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- 239000000835 fiber Substances 0.000 claims abstract description 50
- 239000013307 optical fiber Substances 0.000 claims abstract description 37
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 230000001360 synchronised effect Effects 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000010355 oscillation Effects 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000002269 spontaneous effect Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 13
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
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- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- SITVSCPRJNYAGV-UHFFFAOYSA-L tellurite Chemical compound [O-][Te]([O-])=O SITVSCPRJNYAGV-UHFFFAOYSA-L 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
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Abstract
The utility model discloses a kind of tunable ultrashort pulse Fiber-optic parameter oscillator, it is related to parametric oscillator, field of lasers.The oscillator includes：Tunable laser, isolator, intensity modulator, the first amplifier, wave filter, phase-modulator, the second amplifier, the first Polarization Controller, circulator, chirped fiber grating, wavelength division multiplexer, highly nonlinear optical fiber, fiber coupler and the second Polarization Controller.The utility model uses time lens combination Compressed pulse, realizes the tunable ultra-short pulse source of repetition rate, operation wavelength, repetition rate is determined by the radiofrequency signal being applied on time lens, easily synchronous with parametric oscillator.Repetition rate, the tunable wave length characteristic of use time lens light source, binding time dispersion tuning and pumping wavelength Tuning mechanism, Fiber-optic parameter oscillator can realize tunable wide service band, the ultra-short pulse laser output of high impulse quality.
Description
Technical Field
The utility model relates to a parametric oscillator, laser instrument field, more specifically relate to a tunable ultrashort pulsed optical fiber parametric oscillator.
Background
Ultrashort pulse light sources (picoseconds and femtosecond magnitude) become indispensable tools for modern science and production, and are widely applied to various scientific researches and industrial fields, such as nonlinear optics, ultrafast spectroscopy, bio-optics, photochemistry, micro-nano processing and the like. How to develop a high-performance tunable ultrashort pulse laser source has become an urgent task to open many exciting applications.
In a typical nonlinear parametric process, such as Four-wave mixing (Four-wave mixing), a high-power pump beam and a signal beam interact with each other in a nonlinear medium to generate an idler beam, and the pump light energy is transferred to the signal beam and the idler beam simultaneously to realize gain amplification. The nonlinear medium is placed in a resonant cavity, high-power pump light is used for excitation, a pair of spontaneous radiation noises meeting the phase matching condition are used as signal light and idler frequency light, and gain is obtained in the resonance process. When the gain in the cavity is larger than the loss, the signal light and the idler light output are obtained, and the optical parametric oscillator is obtained. Optical parametric oscillators have many advantages, including that the gain band is limited only by the transparent window of the medium; the broadband tunable laser has large gain bandwidth and can support the work of broadband tunable laser; the parametric process response time is in the femtosecond order and is suitable for both continuous and pulsed lasers.
In order to generate ultrashort optical pulses, the parametric oscillator must be synchronized with the pump pulse light source. It is common practice to adjust the cavity length with an optically tunable delay line to ensure synchronization and achieve a certain wavelength tuning. However, the cavity length adjustment brings instability to the resonant cavity, and the adjustable range is limited, so that the working wavelength range and the repetition frequency range of the ultrashort pulse optical parametric oscillator are limited.
In summary, the ultrashort pulse optical parametric oscillator in the prior art has the problem of limited tunable ranges of wavelength and repetition frequency.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a tunable ultrashort pulse optical fiber parametric oscillator for there are ultrashort pulse optical parametric oscillator's wavelength, the limited problem of repetition frequency adjustable range among the solution prior art.
The embodiment of the utility model provides a tunable ultrashort pulse optical fiber parametric oscillator, including time lens-based pumping light source unit, amplification and chirp unit, oscillation chamber unit, time lens-based pumping light source unit with amplify with chirp unit link to each other, amplify with chirp unit and oscillation chamber unit link to each other; after the continuous laser of C wave band generated by the pumping light source unit based on the time lens is modulated in intensity and phase, the initial wide pulse sequence of the required repetition frequency is generated and introduced into the amplification and chirp unit, and the ultrashort light pulse with the pulse width less than 1ps is obtained; the ultrashort optical pulse gains a pair of spontaneous emission noises meeting the phase matching condition in the resonant cavity unit to become signal light and idler frequency light, and the pump pulse light source of the pump light source unit based on the time lens is adjusted to be synchronous with the laser pulse output by the optical fiber coupling of the oscillation cavity unit, wherein the signal light resonates in the cavity, and the idler frequency light is output as parametric laser.
Preferably, the repetition frequency of the fiber parametric oscillator is determined by a radio frequency RF signal applied to a time lens based pump light source unit, and the laser wavelength is adjusted by a tunable laser. .
Preferably, the time lens-based pump light source unit includes a tunable laser, an isolator, an intensity modulator, a first amplifier, a filter, and a phase modulator, which are connected in sequence.
Preferably, the amplifying and chirping unit comprises a second amplifier, a first polarization controller, a circulator and a chirped fiber grating which are connected in sequence.
Preferably, the output end of the first polarization controller is connected with a first port of a circulator, a second port of the circulator is connected with the chirped fiber grating, and a third port of the circulator is connected with the oscillation cavity unit.
Preferably, the oscillation cavity unit comprises a wavelength division multiplexer, a high nonlinear optical fiber, an optical fiber coupler and a second polarization controller; wherein the amplifying and chirping unit is connected with the first port of the wavelength division multiplexer; and a second port of the wavelength division multiplexer is connected with a first end of the optical fiber coupler through the high nonlinear optical fiber, a third port of the optical fiber coupler is connected with a second end of the optical fiber coupler through the second polarization controller, and a third end of the parametric oscillator outputs idler frequency light.
Preferably, the phase modulator comprises a plurality of phase modulators, and the plurality of phase modulators are connected in series.
Preferably, the tunable ultrashort pulse fiber parametric oscillator performs wavelength tuning by using a pump wavelength tuning method or a time dispersion tuning method, specifically:
(1) pump wavelength tuning method
The laser wavelength of a light source in a pumping light source unit based on a time lens is adjusted, namely ultrashort pulse light with different wavelengths can be generated in a middle infrared band, and the repetition frequency of the pumping pulse light is assisted to be finely adjusted, so that the parametric oscillator and the pumping pulse light source are kept synchronous.
(2) Time dispersion tuning
The repetition frequency of the pump light pulse is tuned, signal light with different wavelengths can be selected for resonance, when the pump pulse light enters the nonlinear optical fiber, a series of signal light and idler frequency light with different wavelengths are generated in a parametric gain range, due to the existence of optical fiber dispersion, the round-trip time of light components with different wavelengths in a parametric oscillator cavity is different, and only when the round-trip time is integral multiple of the period of the pump pulse, the light components with the wavelengths obtain maximum gain and realize resonance.
The embodiment of the utility model provides an in, provide a tunable ultrashort pulsed optical fiber parametric oscillator, compare with prior art, its beneficial effect as follows:
1. the utility model discloses to combine ultrashort pulse pump light source and nonlinear fiber resonator based on time lens, realized tunable ultrashort pulse optical fiber parameter oscillator. Furthermore, the utility model discloses a time lens (time lens) system compression light pulse realizes the tunable ultrashort pulse light source of repetition frequency, working wavelength, and wherein, repetition frequency is decided by the radio frequency signal who applys on the time lens, very easily with the synchronous of parametric oscillator; the wavelength is determined by the tunable laser.
2. The utility model discloses using the repetition frequency of time lens light source, wavelength tunable characteristic, when combining time dispersion tuning and the mechanism of pump wavelength tuning, the ultrashort pulse laser output of wide operating band, high pulse quality can be realized to the optical fiber parameter oscillator, has solved the limited problem of wavelength, the adjustable range of repetition frequency of ultrashort pulse optical parameter oscillator promptly.
3. Compared with common optical parametric oscillators, crystals such as lithium niobate (LiNbO 3) and potassium dihydrogen phosphate (KDP) are mostly used as nonlinear media, and the laser output wavelength covers various optical bands from ultraviolet to middle infrared. However, due to the anisotropy of the nonlinear crystal, the laser output wavelength needs to be tuned by changing the refractive index of the crystal or the incident angle of the pump light, the system is complex, the maintenance is difficult, and the further improvement of the laser source performance is limited. The utility model discloses the type adopts high nonlinear fiber to construct optic fibre optical parameter oscillator as nonlinear medium, and its tuning, practicality and stability have all had substantial progress.
Drawings
Fig. 1 is a schematic structural diagram of a tunable ultrashort pulse fiber parametric oscillator according to an embodiment of the present invention;
FIG. 2 is a typical dispersion diagram of a tellurite glass optical fiber according to an embodiment of the present invention;
fig. 3 is a conversion relationship diagram of the signal light and the idler light meeting the phase matching condition varying with the wavelength of the pump light according to the embodiment of the present invention;
fig. 4 is an output spectrum diagram of a tunable ultrashort pulse fiber parametric oscillator according to an embodiment of the present invention.
Description of reference numerals:
101-tunable laser, 102-isolator, 103-intensity modulator, 104-first amplifier, 105-filter, 106-phase modulator, 107-second amplifier, 108-first polarization controller, 109-circulator, 1091-circulator first port, 1092-circulator second port, 1093-circulator third port, 110-chirped fiber grating, 111-wavelength division multiplexer, 1111-wavelength division multiplexer first port, 1112-wavelength division multiplexer second port, 1113-wavelength division multiplexer third port, 112-high nonlinear fiber, 113-fiber coupler, 1131-fiber coupler first port, 1132-fiber coupler second port, 1133-fiber coupler third port, 114-second polarization controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a tunable ultrashort pulse fiber parametric oscillator according to an embodiment of the present invention. As shown in fig. 1, the oscillator includes: tunable laser 101, isolator 102, intensity modulator 103, first amplifier 104, filter 105, phase modulator 106, second amplifier 107, first polarization controller 108, circulator 109, chirped fiber grating 110, wavelength division multiplexer 111, high nonlinearity fiber 112, fiber coupler 113, and second polarization controller 114.
Specifically, the tunable laser 101 is connected to an isolator 102, an intensity modulator 103, a first amplifier 104, a filter 105, a phase modulator 106, a second amplifier 107, and a first polarization controller 108 in this order; the output end of the first polarization controller 108 is connected with a first port 1091 of the circulator, a second port 1092 of the circulator is connected with the chirped fiber grating 110, and a third port 1093 of the circulator is connected with a first port 1111 of the wavelength division multiplexer; the wavelength division multiplexer second port 1112 is connected to the fiber coupler first end 1131 through the high nonlinear fiber 112, the wavelength division multiplexer third port 1113 is connected to the fiber coupler second end 1132 through the second polarization controller 114, and the fiber coupler third port 1133 outputs idler light.
It should be noted that the utility model discloses to combine ultrashort pulse pump light source and nonlinear fiber resonator based on time lens, realized the ultrashort pulse optical fiber parameter oscillator of tunable. Further, the utility model discloses a time lens (time lens) system compression light pulse realizes the ultrashort pulse light source that repetition frequency, working wavelength are tunable, and wherein, repetition frequency is decided by the radio frequency signal who applys on the time lens, very easily with the parametric oscillator synchronization, the wavelength is decided by tunable laser. By using the characteristic of tunable repetition frequency and wavelength of the time lens light source and combining the time dispersion tuning and pumping wavelength tuning mechanisms, the optical fiber parametric oscillator can realize the output of ultrashort pulse laser with wide working waveband and high pulse quality, namely the problem of limited adjustable range of wavelength and repetition frequency of the ultrashort pulse optical parametric oscillator is solved.
Further, the utility model discloses a high nonlinear fiber constructs fiber optic parametric oscillator as nonlinear medium, and its tuning, practicality and stability have all had substantial progress.
The embodiment of the utility model provides a pair of tunable ultrashort pulse optical fiber parametric oscillator, its theory of operation as follows:
the utility model discloses a tunable laser 101, isolator 102, intensity modulator 103, first amplifier 104, wave filter 105 and phase modulator 106 constitute the ultrashort pulse pump light source of high energy based on time lens. Specifically, continuous laser light of the C-band is generated by a tunable laser 101, an initial wide pulse train of a desired repetition frequency is obtained via an intensity modulator 103, and a specific phase chirp is introduced to the initial wide pulse train using a plurality of phase modulators connected in series.
The utility model discloses a second amplifier 107, first polarization controller 108, circulator 109 and chirp fiber grating 110 amplify the pump light source and chirp, obtain the ultrashort light pulse that the pulsewidth is less than 1ps, and wherein, the repetition frequency of time lens pulsed light source is decided by radio frequency RF signal, and laser wavelength is decided by tunable laser, has consequently realized that repetition frequency, wavelength all can be on a large scale harmonious pulse laser output.
The utility model discloses a wavelength division multiplexer 111, high nonlinear fiber 112, optical fiber coupler 113 and second polarization controller 114 constitute the oscillation chamber, behind the high nonlinear fiber 112 of pump light incidence of enlargeing and chirp, a pair of spontaneous radiation noise that satisfies the phase matching condition will obtain the gain and become signal light and idler frequency light, adjust the laser pulse synchronization of pump pulse light source and optical fiber coupler 113 output, then signal light will be at the intracavity resonance wherein, idler frequency light then is as parametric laser output.
It should be noted that the theoretical model of the fiber parametric oscillator according to the present invention is as follows:
in the nonlinear parametric process, a high-power pump light is used to excite the nonlinear fiber, and the pump light energy is transferred to other frequencies and generates parametric gain. The parametric process generation efficiency at a certain frequency depends on the phase matching condition, and the expression is as follows:
（1）
wherein,、the parameters are the frequency difference from the pump light and the fiber dispersion parameter. Controlling the amount of phase mismatch inThe range can effectively improve the efficiency of the parametric processThe time-dependent parametric gain is maximized, wherein,、respectively, the fiber nonlinear coefficient and the pump light power. SelectingAnd isThat is, the pump light frequency is placed in the normal dispersion region, and a pair of gain bands which are symmetrical in position and centered on the pump light frequency are generated through a parametric process. The frequency difference of the gain band from the pump light is:
（2）
wherein the non-linear fiber has a zero dispersion point frequencyIs determined, therefore, by varying the frequency of the pump lightThe frequency position of the parametric gain band can be adjusted, thereby realizing the tuning of the wavelengths of the signal light and the idler frequency light. The nonlinear optical fiber is placed in the resonant cavity, and the condition that the resonant cavity only generates resonance to signal light is considered, so that the coupled wave equation of the optical parametric oscillator of the optical fiber can be obtained as follows:
（3）
（4）
（5）
considering that only the signal light resonates in the oscillator, the boundary conditions with respect to the signal light and the pump light are:
（6）
（7）
wherein、The nonlinear fiber length and the single cycle loss of the signal light in the resonant cavity are respectively.
FIG. 2 is a typical dispersion diagram of a tellurite glass optical fiber according to an embodiment of the present invention; fig. 3 is a conversion relationship diagram of the signal light and the idler light that satisfy the phase matching condition according to the change of the wavelength of the pump light provided by the embodiment of the present invention. With reference to fig. 2, as shown in fig. 3, the present invention uses the erbium-doped fiber laser as a pump to adjust the wavelength of the pump light from 1565nm to 1522nm, tune the wavelength of the idler frequency from 2 μm to 3 μm, and change the signal light from 1286nm to 1020 nm. In fig. 3, reference numeral 301 denotes a signal light, and reference numeral 302 denotes an idler light.
The utility model discloses the wavelength tuning of well ultrashort pulsed optical fiber parametric oscillator can be realized through following two kinds of mechanisms:
(1) pump wavelength tuning. The idler can be tuned in a large range in the mid-infrared band by adjusting the wavelength of the pump light in a small range, as shown in fig. 4, fig. 4 is an output spectrogram of the tunable ultrashort pulse optical fiber parametric oscillator provided by the embodiment of the present invention. Therefore, the laser wavelength of the time lens light source is adjusted, i.e. ultrashort pulse light with different wavelengths can be generated in the middle infrared band, and the repetition frequency of the pump pulse light needs to be adjusted in a fine tuning mode in an auxiliary mode, so that the parametric oscillator and the pump pulse light source need to be kept synchronous.
In fig. 4, reference numeral 401 denotes an output light curve generated by a pump light source having a wavelength of 1538nm, 402 denotes an output light curve generated by a pump light source having a wavelength of 1540nm, and 403 denotes an output light curve generated by a pump light source having a wavelength of 1548 nm.
(2) Time dispersion tuning method. When the pump pulse light is incident into the nonlinear optical fiber, a series of signal light and idler frequency light with different wavelengths are generated in a parametric gain range. Due to the presence of fiber dispersion, the round-trip times of the optical components of different wavelengths within the parametric oscillator cavity are different, and the optical components of the wavelengths obtain maximum gain and achieve resonance only when the round-trip times are integer multiples of the pump pulse period. Therefore, the repetition frequency of the tuned pump light pulse can select signal light resonance with different wavelengths, thereby realizing the output wavelength tuning of the fiber parametric oscillator.
The above disclosure is only for a few specific embodiments of the present invention, and those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention, and if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent techniques, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. A tunable ultrashort pulse optical fiber parametric oscillator is characterized in that: the device comprises a time lens-based pumping light source unit, an amplification and chirp unit and an oscillation cavity unit, wherein the time lens-based pumping light source unit is connected with the amplification and chirp unit, and the amplification and chirp unit is connected with the oscillation cavity unit; after the continuous laser of C wave band generated by the pumping light source unit based on the time lens is modulated in intensity and phase, the initial wide pulse sequence of the required repetition frequency is generated and introduced into the amplification and chirp unit, and the ultrashort light pulse with the pulse width less than 1ps is obtained; the ultrashort optical pulse gains a pair of spontaneous emission noises meeting the phase matching condition in the resonant cavity unit to become signal light and idler frequency light, and the pump pulse light source of the pump light source unit based on the time lens is adjusted to be synchronous with the laser pulse output by the optical fiber coupling of the oscillation cavity unit, wherein the signal light resonates in the cavity, and the idler frequency light is output as parametric laser.
2. The tunable ultrashort pulse fiber parametric oscillator of claim 1, wherein: the repetition frequency of the fiber parametric oscillator is determined by the RF signal applied to the time lens based pump source unit, and the laser wavelength is adjusted by the tunable laser.
3. The tunable ultrashort pulse fiber parametric oscillator of claim 1 or 2, wherein: the time lens-based pump light source unit comprises a tunable laser (101), an isolator (102), an intensity modulator (103), a first amplifier (104), a filter (105) and a phase modulator (106) which are connected in sequence.
4. The tunable ultrashort pulse fiber parametric oscillator of claim 1 or 2, wherein: the amplifying and chirping unit comprises a second amplifier (107), a first polarization controller (108), a circulator (109) and a chirped fiber grating (110) which are connected in sequence.
5. The tunable ultrashort pulse fiber parametric oscillator of claim 4, wherein: the output end of the first polarization controller (108) is connected with a first port (1091) of a circulator, a second port (1092) of the circulator is connected with the chirped fiber grating (110), and a third port (1093) of the circulator is connected with the oscillation cavity unit.
6. The tunable ultrashort pulse fiber parametric oscillator of claim 1, wherein: the oscillation cavity unit comprises a wavelength division multiplexer (111), a high nonlinear optical fiber (112), an optical fiber coupler (113) and a second polarization controller (114); wherein the amplifying and chirping unit is connected to the wavelength division multiplexer first port (1111); the second port (1112) of the wavelength division multiplexer is connected with the first end (1131) of the optical fiber coupler through the high nonlinear optical fiber (112), the third port (1113) of the optical fiber coupler is connected with the second end (1132) of the optical fiber coupler through the second polarization controller (114), and the third end (1133) of the parametric oscillator outputs idle frequency light.
7. The tunable ultrashort pulse fiber parametric oscillator of claim 3, wherein: the phase modulator (106) includes a plurality of phase modulators, and the plurality of phase modulators are connected in series.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106654829A (en) * | 2017-02-23 | 2017-05-10 | 苏州龙格库塔光电科技有限公司 | Tunable ultrashort pulse fiber optic parametric oscillator |
| CN112736638A (en) * | 2021-01-14 | 2021-04-30 | 北京工业大学 | All-fiber narrow-linewidth nanosecond tunable green laser |
| CN113285344A (en) * | 2021-04-02 | 2021-08-20 | 华东师范大学重庆研究院 | Wide-band tunable two-color ultrafast pulse synchronization technology |
| CN113875102A (en) * | 2019-04-25 | 2021-12-31 | 罗切斯特大学 | Drive chamber femtosecond source |
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2017
- 2017-02-23 CN CN201720164584.5U patent/CN206498081U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654829A (en) * | 2017-02-23 | 2017-05-10 | 苏州龙格库塔光电科技有限公司 | Tunable ultrashort pulse fiber optic parametric oscillator |
| CN113875102A (en) * | 2019-04-25 | 2021-12-31 | 罗切斯特大学 | Drive chamber femtosecond source |
| CN112736638A (en) * | 2021-01-14 | 2021-04-30 | 北京工业大学 | All-fiber narrow-linewidth nanosecond tunable green laser |
| CN112736638B (en) * | 2021-01-14 | 2024-04-26 | 北京工业大学 | Full-optical-fiber narrow linewidth nanosecond tunable green laser |
| CN113285344A (en) * | 2021-04-02 | 2021-08-20 | 华东师范大学重庆研究院 | Wide-band tunable two-color ultrafast pulse synchronization technology |
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