CN102946047B - Seed injection single frequency optical parametric oscillator - Google Patents
Seed injection single frequency optical parametric oscillator Download PDFInfo
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- CN102946047B CN102946047B CN201210506099.3A CN201210506099A CN102946047B CN 102946047 B CN102946047 B CN 102946047B CN 201210506099 A CN201210506099 A CN 201210506099A CN 102946047 B CN102946047 B CN 102946047B
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Abstract
The invention provides a seed injection single frequency optical parametric oscillator which comprises an extra-cavity seed light source, an integrated driven resonant cavity, an electric control processing part and a single frequency pumping source. The seed injection single frequency optical parametric oscillator has the characteristics of compact structure, narrow linewidth, high optical quality and high frequency stability, is strong in capacity of resisting external disturbance, and can be applied to complex environments such as onboard or satellite-borne experimental platforms.
Description
Technical field
The present invention relates to single frequency laser, particularly a kind of seed injects single-frequency optical parametric oscillator.
Background technology
Airborne, spaceborne radar system is to measure earth surface pattern, steam, CO
2distribute and O
3the very effective means of one that distribute.The most most important in laser radar system is exactly LASER Light Source, and for geoscience, research has very important meaning to the reliable single frequency laser of therefore invention performance.
The frequency stability of the pure-tone pulse optical parametric oscillator of having reported is at present not high, how in realizing single-frequency output, to improve the frequency stability of laser, is the study hotspot of current laser radar laser always.The pure-tone pulse optical parametric oscillator injecting for seed, realizes the long method of controlling in chamber and mainly contains: heterodyne method scheme, sine sweep detecting strategy and resonance detecting strategy.The output of heterodyne method scheme energy bonding longitudinal mode, but high to requirement on devices, complex structure, and after each bright dipping, cavity length is regulated, anti-interference is poor.Sine sweep detecting strategy does not need high-velocity scanning and high speed signal processing, reduce the requirement to control circuit components and parts, but its essence is still after output pulse laser, chamber progress row to be regulated, and does not possess real-time and the antijamming capability of resonance probe scheme.The frequency stability of utilizing resonance probe scheme to obtain is the highest, but need to open pump light at interference signal maximum place, by electronic device restriction itself, is difficult to ensure synchronism.The key that obtains high frequency stability, is to open pump light at interference signal maximum place, produces single longitudinal mode output.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of seed to inject single-frequency optical parametric oscillator, the anti-external interference ability that this oscillator can safeguards system, obtains the single longitudinal mode laser pulse output of high frequency stability.
Operation principle of the present invention:
A kind of seed injects the single-frequency optical parametric oscillator of integrated Resonator design, utilize improved resonance probe scheme, i.e. scanning-keep-trigger, in piezoelectric ceramic scan light parametric oscillator resonant cavity growth process, in the time scanning interference signal maximum, remain on this position, until pump light is opened, ensure mechanical passive stabilization in conjunction with the integrity design of resonant cavity, ensure the single longitudinal mode laser output of high frequency stability.
The technology of the present invention solution is:
A kind of seed injects single-frequency optical parametric oscillator, and feature is that its structure comprises seed light source outside chamber, integrated driven resonant cavity, electricity control processing section and single-frequency pumping source four parts:
Outside described chamber, seed light source comprises seed laser, is coupled lens, isolator group, half-wave plate successively along the Laser output direction of this seed laser, first speculum and the dichroic mirror at 45 ° with light path;
Described integrated driven resonant cavity comprises integrated resonant cavity, in this resonant cavity framework, be provided with the first chamber mirror, the second chamber mirror, the 3rd chamber mirror and the 4th chamber mirror, seed laser direction along described dichroic mirror reflection is the first chamber mirror successively, the second chamber mirror, the 3rd chamber mirror and the 4th chamber mirror, the second speculum output outside the first chamber mirror and chamber again, in the light path between described the first chamber mirror and the second chamber mirror, there are two to walk the nonlinear crystal of placing from compensation, the 3rd described chamber mirror is fastened on piezoelectric ceramic, the extended line of the light path between the 3rd chamber mirror and the 4th chamber mirror is provided with photodiode,
Described electricity control processing section is made up of described photodiode, piezoelectric ceramic, Piezoelectric Ceramic source and sequential control system, the output in described Piezoelectric Ceramic source is connected with the input of described piezoelectric ceramic, the input of described sequential control system is connected with described photodiode output, and the output of described sequential control system is connected with the control end of the input in described Piezoelectric Ceramic source, described pumping source respectively;
Described single-frequency pumping source comprises single-frequency Nd:YAG pulse laser and focus lamp, and the pulse laser of described single-frequency Nd:YAG pulse laser output enters described integrated driven resonant cavity through described dichroic mirror and carries out pumping after described focus lamp focuses on;
Described sequential control system applies a linear ramp scanning voltage to described piezoelectric ceramic in the starting point of each work period, adjust optical parametric oscillator resonant cavity long, in the time that described sequential control system detects that on described photodiode, seed light is passed through the peak value of interference signal of the 3rd described chamber mirror transmission, keep this position of piezoelectric ceramic, described sequential control system is to described single-frequency pumping source output order simultaneously, open described single-frequency pumping source, export immediately the pulse laser of the parametric oscillation of single-frequency from the second described speculum.
The output wavelength of described seed laser is 1.57 μ m, the first described chamber mirror has transmitance to seed laser 1.57 mum wavelength laser 30%～50% and to the high saturating plated film of pump light 1064nm, the second cavity mirror plating has pair seed laser high anti-and to the anti-reflection film of pump light, the 3rd chamber mirror has high-reflecting film, the 4th chamber mirror has the high-reflecting film to seed laser low transmission, the arsenic acid titanyl potassium crystal (KTiOAsO that described nonlinear crystal is critical cutting
4, KTA).
Described integrated resonant cavity is to be processed by an aluminium block, described the first chamber mirror and the second chamber mirror are directly fixed on the sidewall of cavity, the 3rd described chamber mirror and the 4th chamber mirror and nonlinear crystal, by adaptor, are fixed on the base plate of described integrated resonant cavity.
Described coupled lens changes seed light beam, makes its spot size in resonant cavity the same with the vibration spot size that resonant cavity produces.
Described isolator group keeps the one-way transmission of light path, in order to avoid the pulse laser spilling from Effect of Back-Cavity Mirror enters seed laser and affects its output.
Described half-wave plate will be adjusted into the polarised light that meets injection condition from the line polarisation of isolator output.The first speculum and dichroic mirror that described light path is at 45 °, enter in resonant cavity seed light, and light path is consistent with the vibration light path of resonant cavity.
Described single-frequency pumping source is that seed injects single-frequency Nd:YAG pulse laser.
The present invention compared with prior art has the following advantages:
1, utilize seed to inject, can obtain narrow-linewidth single frequency pulse laser.
2, adopt resonant cavity integrated design, compact conformation, stability is high, and antijamming capability is strong.
3, adopt from collocation structure, ensure high efficiency, high light beam quality Laser output.
4, adopt resonance probe scheme, can realize the pure-tone pulse output of high frequency stability.
Brief description of the drawings
Fig. 1 is the structured flowchart that seed of the present invention injects pure-tone pulse laser;
Fig. 2 is that connection layout is processed in electricity control;
Fig. 3 is that the ramp voltage that applies on piezoelectric ceramic, cavity length change, sequential relationship between the parameter laser pulse of interference signal, pump light pulse and the output of seed light.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the structured flowchart that seed of the present invention injects pure-tone pulse laser, as can be seen here, seed of the present invention injects single-frequency optical parametric oscillator, and its structure comprises seed light source 1 outside chamber, integrated driven resonant cavity 2, electricity control processing section 3 and single-frequency pumping source 4 four parts:
Outside described chamber, seed light source 1 comprises seed laser 1-1, is coupled lens 1-2, isolator group 1-3,1-4, half-wave plate 1-5 successively along the Laser output direction of seed laser 1-1, first speculum 1-6 and the dichroic mirror 1-7 at 45 ° with light path;
Described integrated driven resonant cavity 2 comprises integrated resonant cavity 2-7, in this resonant cavity framework 2-7, be provided with the first chamber mirror 2-1, the second chamber mirror 2-2, the 3rd chamber mirror 2-3 and the 4th chamber mirror 2-4, seed laser direction along dichroic mirror 1-7 reflection is the first chamber mirror 2-1 successively, the second chamber mirror 2-2, the 3rd chamber mirror 2-3 and the 4th chamber mirror 2-4, the second speculum 2-8 output outside the first chamber mirror 2-1 and chamber again, in the light path between described the first chamber mirror 2-1 and the second chamber mirror 2-2, be provided with two and walk the nonlinear crystal 2-5 and the 2-6 that place from compensation, the 3rd described chamber mirror 2-3 is fastened on piezoelectric ceramic 3-2, the extended line of the light path between the 3rd chamber mirror 2-3 and the 4th chamber mirror 2-4 is provided with photodiode 3-1,
Described electricity control processing section 3 is made up of described photodiode 3-1, piezoelectric ceramic 3-2, Piezoelectric Ceramic source 3-3 and sequential control system 3-4, the output of described Piezoelectric Ceramic source 3-3 is connected with the input of described piezoelectric ceramic 3-2, the input of described sequential control system 3-4 is connected with described photodiode 3-1 output, the output of described sequential control system 3-4 is connected with the control end of the input of described Piezoelectric Ceramic source 3-3, described pumping source 4 respectively, as shown in Figure 2;
Described single-frequency pumping source 4 comprises single-frequency Nd:YAG pulse laser 4-1 and focus lamp 4-2, and the pulse laser of described single-frequency Nd:YAG pulse laser 4-1 output enters described integrated driven resonant cavity 2 through described dichroic mirror 1-7 and carries out pumping after described focus lamp 4-2 focuses on;
Described sequential control system 3-4 applies a linear ramp scanning voltage to described piezoelectric ceramic 3-2 in the starting point of each work period, adjust optical parametric oscillator resonant cavity long, in the time that described sequential control system 3-4 detects the peak value of interference signal of the 3rd described chamber mirror 2-3 transmission of the upper seed light process of described photodiode 3-1, keep this position of piezoelectric ceramic 3-2, described sequential control system 3-4 is to described single-frequency pumping source 4 output orders simultaneously, open described single-frequency pumping source 4, export immediately the pulse laser of the parametric oscillation of single-frequency from the second described speculum 2-8.
The output wavelength of described seed laser 1-1 is 1.57 μ m, the first described chamber mirror 2-1 has transmitance to seed laser 1.57 mum wavelength laser 30%～50% and to the high saturating plated film of pump light 1064nm, the second chamber mirror 2-2 is coated with high anti-and to the anti-reflection film of pump light to seed laser, the 3rd chamber mirror 2-3 has high-reflecting film, the 4th chamber mirror 2-4 has the high-reflecting film to seed laser low transmission, the arsenic acid titanyl potassium crystal that described nonlinear crystal 2-5 and 2-6 are critical cutting.
Described integrated resonant cavity 2-7 is processed by an aluminium block, described the first chamber mirror 2-1 and the second chamber mirror 2-2 are directly fixed on the sidewall of cavity, the 3rd described chamber mirror 2-3 and the 4th chamber mirror 2-4 and nonlinear crystal 2-5 and 2-6, by adaptor, are fixed on the base plate of described integrated resonant cavity 2-7.
The sequential of improved resonance probe method as shown in Figure 3.Described sequential control system 3-4 applies a linear ramp scanning voltage to described piezoelectric ceramic 3-2 at the starting point t0 of each work period, adjust optical parametric oscillator resonant cavity long, t1 in the time that seed light is passed through the peak value of the interference signal of the 3rd described chamber mirror 2-3 transmission on the photodiode 3-1 described in described sequential control system 3-4 detects, keep this position of piezoelectric ceramic 3-2 until t2, described sequential control system 3-4 is to described single-frequency pumping source 4 output orders simultaneously, open described single-frequency pumping source 4, export immediately the pulse laser of the parametric oscillation of single-frequency from the second described speculum 2-8.
Claims (3)
1. seed injects a single-frequency optical parametric oscillator, is characterised in that its structure comprises seed light source outside chamber (1), integrated driven resonant cavity (2), electricity control processing section (3) and single-frequency pumping source (4) four parts:
Seed light source outside described chamber (1) comprises seed laser (1-1), coupled lens (1-2), isolator group (1-3,1-4), half-wave plate (1-5) successively along the Laser output direction of seed laser (1-1), first speculum (1-6) and the dichroic mirror (1-7) at 45 ° with light path;
Described integrated driven resonant cavity (2) comprises integrated resonant cavity (2-7), in this resonant cavity (2-7), be provided with the first chamber mirror (2-1), the second chamber mirror (2-2), the 3rd chamber mirror (2-3) and the 4th chamber mirror (2-4), seed laser direction along dichroic mirror (1-7) reflection is the first chamber mirror (2-1) successively, the second chamber mirror (2-2), the 3rd chamber mirror (2-3) and the 4th chamber mirror (2-4), the second speculum (2-8) outside the first chamber mirror (2-1) and chamber output again, in the light path between described the first chamber mirror (2-1) and the second chamber mirror (2-2), there are two to walk the nonlinear crystal (2-5 and 2-6) of placing from compensation, the 3rd described chamber mirror (2-3) is fastened on piezoelectric ceramic (3-2), the extended line of the light path between the 3rd chamber mirror (2-3) and the 4th chamber mirror (2-4) is provided with photodiode (3-1),
Described electricity control processing section (3) is by described photodiode (3-1), piezoelectric ceramic (3-2), Piezoelectric Ceramic source (3-3) and sequential control system (3-4) form, the output in described Piezoelectric Ceramic source (3-3) is connected with the input of described piezoelectric ceramic (3-2), the input of described sequential control system (3-4) is connected with described photodiode (3-1) output, the output of described sequential control system (3-4) respectively with the input in described Piezoelectric Ceramic source (3-3), the control end of described single-frequency pumping source (4) is connected,
Described single-frequency pumping source (4) comprises single-frequency Nd:YAG pulse laser (4-1) and focus lamp (4-2), and the pulse laser of described single-frequency Nd:YAG pulse laser (4-1) output enters described integrated driven resonant cavity (2) through described dichroic mirror (1-7) and carries out pumping after described focus lamp (4-2) focuses on;
Described sequential control system (3-4) applies a linear ramp scanning voltage to described piezoelectric ceramic (3-2) in the starting point of each work period, adjust optical parametric oscillator resonant cavity long, in the time that described sequential control system (3-4) detects the peak value of interference signal of the 3rd described chamber mirror (2-3) transmission of the upper seed laser process of described photodiode (3-1), keep the position of piezoelectric ceramic (3-2), described sequential control system (3-4) is to described single-frequency pumping source (4) output order simultaneously, open described single-frequency pumping source (4), export immediately the pulse laser of the parametric oscillation of single-frequency from described the second speculum (2-8).
2. seed according to claim 1 injects single-frequency optical parametric oscillator, the output wavelength that it is characterized in that described seed laser (1-1) is 1.57 μ m, the first described chamber mirror (2-1) has transmitance to seed laser 1.57 mum wavelength laser 30%～50% and to the high saturating plated film of pump light 1064nm, the second chamber mirror (2-2) is coated with high anti-and to the anti-reflection film of pump light to seed laser, the 3rd chamber mirror (2-3) has high-reflecting film, the 4th chamber mirror (2-4) has the high-reflecting film to seed laser low transmission, described nonlinear crystal (2-5 and 2-6) is the arsenic acid titanyl potassium crystal of critical cutting.
3. seed according to claim 1 injects single-frequency optical parametric oscillator, it is characterized in that described integrated resonant cavity (2-7) is to be processed by an aluminium block, described the first chamber mirror (2-1) and the second chamber mirror (2-2) are directly fixed on the sidewall of cavity, the 3rd described chamber mirror (2-3) and the 4th chamber mirror (2-4) and nonlinear crystal (2-5 and 2-6), by adaptor, are fixed on the base plate of described integrated resonant cavity (2-7).
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| WO2015098321A1 (en) * | 2013-12-24 | 2015-07-02 | ソニー株式会社 | Control device, control method, and program |
| CN104779516B (en) * | 2015-04-20 | 2017-09-12 | 中国科学院上海光学精密机械研究所 | In infrared single-frequency optical parametric oscillator |
| CN106856292B (en) * | 2017-02-21 | 2019-03-08 | 中国科学院上海光学精密机械研究所 | 2 mu m waveband pure-tone pulse optical parametric oscillator of injection seeded based on heterodyne beat locking |
| CN111417249A (en) * | 2019-01-07 | 2020-07-14 | 中国科学院大连化学物理研究所 | Method for preparing molecular beam by excitation of molecule broad-band vibration-inversion state |
| CN110556696B (en) * | 2019-08-20 | 2021-03-09 | 中国科学技术大学 | Injection type optical parametric oscillation device and method |
| CN110571639A (en) * | 2019-09-29 | 2019-12-13 | 中国科学技术大学 | nanosecond pulse narrow-linewidth optical parametric oscillator for seed light injection |
| CN115663581B (en) * | 2022-10-25 | 2023-12-01 | 中国科学院上海光学精密机械研究所 | Single-frequency dual-wavelength dual-pulse optical parametric oscillation laser |
| CN116191189A (en) * | 2023-04-19 | 2023-05-30 | 山西大学 | Single-frequency continuous optical parametric oscillator |
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| CN2358613Y (en) * | 1998-12-10 | 2000-01-12 | 山西大学 | Full solidification single-frequency double frequency laser |
| CN1256536A (en) * | 1998-12-10 | 2000-06-14 | 山西大学 | Single-frequency frequency-doubling solid laser |
| CN102354074A (en) * | 2011-09-01 | 2012-02-15 | 山西大学 | Two-tone tunable continuous variable entanglement state generation and detection device |
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| US7620077B2 (en) * | 2005-07-08 | 2009-11-17 | Lockheed Martin Corporation | Apparatus and method for pumping and operating optical parametric oscillators using DFB fiber lasers |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2358613Y (en) * | 1998-12-10 | 2000-01-12 | 山西大学 | Full solidification single-frequency double frequency laser |
| CN1256536A (en) * | 1998-12-10 | 2000-06-14 | 山西大学 | Single-frequency frequency-doubling solid laser |
| CN102354074A (en) * | 2011-09-01 | 2012-02-15 | 山西大学 | Two-tone tunable continuous variable entanglement state generation and detection device |
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