阅读说明：本技术 基于电光相位调制频移反馈环路的双脉冲激光产生方法 (Double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop ) 是由 王磊 杨宏志 毛叶飞 高原 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种基于电光相位调制频移反馈环路的双脉冲激光产生方法,包括,使单频种子激光经耦合器输入端注入到频移反馈环路中,单频种子激光在频移反馈环路中依次经过偏振控制器、电光相位调制器、低噪光学放大器、窄带滤波器、在线起偏器后再次反馈至耦合器输入端,通过调节电光相位调制器的调制频率,使电光相位调制器的调制频率等于整数倍频移反馈环路基频,耦合器的输出端输出双脉冲激光。基于该方法,可精确控制并计算双脉冲间隔,双脉冲激光重频可调谐、脉宽短、结构简单、便于应用,且采用光纤器件,产生装置体积小、可靠性、稳定性高。(The invention discloses a kind of double-pulse laser production methods based on electric light phase-modulation frequency shift feedback loop, including, it is injected into single-frequency seed laser in frequency shift feedback loop through coupler input terminal, single-frequency seed laser successively passes through Polarization Controller in frequency shift feedback loop, electro-optic phase modulator, low noise optical amplifier, narrow band filter, coupler input is fed back to again after the line polarizer, by the modulating frequency for adjusting electro-optic phase modulator, the modulating frequency of electro-optic phase modulator is set to be equal to integral multiple frequency displacement feedback control loop fundamental frequency, the output end of coupler exports double-pulse laser.Based on this method, double-pulsed time is accurately controlled and calculates, double-pulse laser repetition is tunable, pulsewidth is short, structure is simple, convenient for application, and uses optical fibre device, and generation device is small in size, reliability, stability are high.)

1. a kind of double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop, which is characterized in that the production Generation method includes,

It is injected into single-frequency seed laser (1) in frequency shift feedback loop through coupler (2) input terminal；

Single-frequency seed laser (1) is in frequency shift feedback loop successively by Polarization Controller (3), electro-optic phase modulator (4), low It makes an uproar and feeds back to coupler (2) input terminal again after optical amplifier (5), narrow band filter (6), the online polarizer (7), pass through tune The modulating frequency of economize on electricity optical phase modulator (4) makes the modulating frequency of electro-optic phase modulator (4) be equal to integral multiple frequency shift feedback The output end of loop fundamental frequency, coupler (2) exports double-pulse laser.

2. double-pulse laser production method according to claim 1, which is characterized in that

By adjusting the modulation depth of the electro-optic phase modulator (4) and the frequency of the single-frequency seed laser (1), institute is adjusted State the pulse spacing of double-pulse laser.

3. double-pulse laser production method according to claim 2, which is characterized in that

The modulation depth of the electro-optic phase modulator (4) is preferably π.

4. double-pulse laser production method according to claim 1, which is characterized in that

By selecting the gain of low noise optical amplifier (5) and the bandwidth of narrow band filter (6), the double-pulse laser is adjusted Pulse width.

5. double-pulse laser production method according to claim 1, which is characterized in that

By adjusting the modulating frequency of the electro-optic phase modulator (4), the repetition of the double-pulse laser is adjusted.

6. double-pulse laser production method according to any one of claims 1-5, which is characterized in that

Single-frequency seed laser (1) is generating double-side band shift frequency, single-frequency seed laser (1) warp after electro-optic phase modulator (4) The transfer function of electro-optic phase modulator (4) is,

Wherein, V_mFor RF drive, V_πFor half-wave voltage, ω_mFor modulating frequency.

7. double-pulse laser production method according to any one of claims 1-5, which is characterized in that the single-frequency seed Laser (1) passes through low noise optical amplifier (5) Shi Jinhang signal compensation.

8. double-pulse laser production method according to any one of claims 1-5, which is characterized in that narrow band filter (6) passband central frequency is equal to the frequency of the single-frequency seed laser (1).

9. double-pulse laser production method according to any one of claims 1-5, which is characterized in that the single-frequency seed Laser is preferably linearly polarized laser.

10. double-pulse laser production method according to any one of claims 1-5, which is characterized in that the coupler (2) it is 2 × 2 couplers (2).

11. double-pulse laser production method according to any one of claims 1-5, which is characterized in that the electric light phase Position modulator (4) includes RF driving source.

Technical field

The present invention relates to photoelectron technologies, more particularly to a kind of double arteries and veins based on electric light phase-modulation frequency shift feedback loop Rush laser generation method.

Background technique

Frequency shifted feedback laser is to be inserted into frequency shifter in conventional Fabry-Perot cavity or annular chamber, so that laser is every Secondary frequency of light wave when passing through frequency shifter all changes, and the introducing of frequency shifter affects the frequency-selecting mode of conventional laser, so that frequency It moves feedback laser and is provided with the time scale window different from conventional laser.Early in 1970, Stanford Univ USA's microwave was real The William Streifer and John professor R.Whinnery discovery of room is tested, it is defeated when acousto-optic frequency shifters are added in laser cavity Continuous laser frequence of exposure chirping characteristics out.Then, numerous researchers begin one's study the time-frequency characteristic of Frequency shifted feedback laser, And confirm it in super high repetition pulse, the generation of the random waveform of microwave signal, chirp light source and wide spectrum light source generation, radio frequency tune A series of aspects such as laser radar processed, area of light real time fourier processing have a wide range of applications.

Ultrashort double-pulse laser is the pulse laser repeated with fixed frequency using a pair of of ultrashort pulse as the period, It has a wide range of applications in fields such as pump probe, laser induced breakdown spectroscopy (LIBS) and Materialbearbeitung mit Laserlichts.For example, Pumping-detection technology is usually to be detected using two-beam to substance: it is a branch of to interact as pump light with substance, The variation of another Shu Zuowei detection light detection pump light or substance, is prolonged by the relative time between control pump light and detection light It is belated to record these evolutionary processes of variation at any time.Pump light and detection light in pumping-detection (Pump-Probe) experiment Relative time-delay be usually to make to generate certain optical path difference reality between two-beam by the spatial movement of accurate translation stage Existing, laboratory is substantially all using the time delay line of commercialization.But pump light and detection light are in the practical opposite of measurement point Time delay is not uniquely determined that transmission of the light in optical element also results in light path loss by optical path difference.Complex optical path Spatial distribution and its optical device caused by optical path difference usually arrive greatly can be compared with delay line, and time delay line is different After scale sampling, it is artificial adjust also due to beam drift and cause optical path difference.Therefore, pump light and detection light are in measurement point Actual time interval becomes accurately to grasp, and not can guarantee the time resolution precision of detection ultrafast process, also cannot achieve pair The accurate control of ultrafast process.Therefore it is badly in need of a kind of ultrashort double-pulse laser that can accurately control and calculate double-pulsed time.

Summary of the invention

The present invention is directed to propose a kind of double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop, with The technical issues of solution is unable to accurately control in the prior art and calculates the double-pulsed time of double-pulse laser.

To achieve the above object, the present invention adopts the following technical scheme that,

A kind of double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop, including, make single-frequency seed Laser is injected into frequency shift feedback loop through coupler input terminal；Single-frequency seed laser is in frequency shift feedback loop successively by inclined Vibration controller, low noise optical amplifier, narrow band filter, feeds back to coupling at electro-optic phase modulator again after the line polarizer Device input terminal makes the modulating frequency of electro-optic phase modulator be equal to integer by adjusting the modulating frequency of electro-optic phase modulator The output end of times frequency displacement feedback control loop fundamental frequency, coupler exports double-pulse laser.

Further, dipulse is adjusted by the modulation depth of adjusting electro-optic phase modulator and the frequency of single-frequency laser to swash The pulse spacing of light.

Further, the modulation depth of electro-optic phase modulator is preferably π.

Further, it by selecting the gain of low noise optical amplifier and the bandwidth of narrow band filter, adjusts dipulse and swashs The pulse width of light.

Further, by adjusting the modulating frequency of electro-optic phase modulator, the repetition of double-pulse laser is adjusted.

Further, single-frequency seed laser is generating double-side band shift frequency after electro-optic phase modulator, and single-frequency seed is sharp Light is through the transfer function of electro-optic phase modulator,

Wherein, V_mFor RF drive, V_πFor half-wave voltage, ω_mFor modulating frequency.

Further, signal compensation is carried out when single-frequency seed laser passes through low noise optical amplifier.

Further, the passband central frequency of narrow band filter is equal to the frequency of single-frequency seed laser.

Further, single-frequency seed laser is preferably linearly polarized laser.

Further, coupler is 2 × 2 couplers.

Further, electro-optic phase modulator includes RF driving source.

The invention has the following advantages:

Double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop of the invention, including, make single-frequency Seed laser is injected into frequency shift feedback loop through coupler input terminal, and single-frequency seed laser successively passes through in frequency shift feedback loop It crosses Polarization Controller, electro-optic phase modulator, low noise optical amplifier, narrow band filter, feed back to again after the line polarizer Coupler input is equal to the modulating frequency of electro-optic phase modulator by adjusting the modulating frequency of electro-optic phase modulator The output end of integral multiple frequency displacement feedback control loop fundamental frequency, coupler exports double-pulse laser.Based on this method, accurately controls and count Double-pulsed time is calculated, double-pulse laser repetition is tunable, pulsewidth is short, structure is simple, convenient for application, and uses optical fibre device, produces Generating apparatus is small in size, reliability, stability are high.

Detailed description of the invention

Attached drawing 1 is that the present invention is based on the double-pulse laser generation devices of electric light phase-modulation frequency shift feedback loop.

In attached drawing, 1- single-frequency seed laser；2- coupler；3- Polarization Controller；4- electro-optic phase modulator；5- low noise light Learn amplifier；6- narrow band filter；The online polarizer of 7-；8- photodetector.

Specific embodiment

The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be limited by following and The multitude of different ways of covering is implemented.

Fig. 1 is that the present invention is based on the double-pulse laser generation devices of electric light phase-modulation frequency shift feedback loop.

As shown in Figure 1, double-pulse laser generation device includes Polarization Controller 3, the electric light phase-modulation by setting gradually The frequency shift feedback loop that device 4, low noise optical amplifier 5, narrow band filter 6, the online polarizer 7 form, is used for single-frequency seed Laser 1 injects the coupler 2 of frequency shift feedback loop, and the photodetector 8 connecting with the output end of coupler 2, and photoelectricity is visited Device 8 is surveyed for measuring to the double-pulse laser parameter exported through coupler 2.

Preferably, electro-optic phase modulator 4 includes RF driving source.

Double-pulse laser production method based on electric light phase-modulation frequency shift feedback loop of the invention, using shown in Fig. 1 Generation device, double-pulse laser production method includes that so that single-frequency seed laser 1 through 2 input terminal of coupler is injected into frequency displacement anti- It presents in loop；Single-frequency seed laser 1 is in frequency shift feedback loop successively by Polarization Controller 3, electro-optic phase modulator 4, low Make an uproar optical amplifier 5, narrow band filter 6, feed back to 2 input terminal of coupler again after the line polarizer 7, pass through adjust electric light phase The modulating frequency ω of position modulator 4_m, make the modulating frequency ω of electro-optic phase modulator 4_mEqual to integral multiple frequency displacement feedback control loop base Frequency ω_c, the output end output double-pulse laser of coupler 2.

In the present invention, in order to effectively inhibit gain in frequency shift feedback loop to be situated between while improving frequency shift feedback loop gain Mode locking characteristic caused by the spontaneous radiation of matter, frequency shift feedback loop are multiple partially using the inclined device of all risk insurance or the addition of non-polarization-maintaining device Control device of shaking is to realize that the laser transmitted in loop is linear polarization.

Preferably, single-frequency seed laser 1 is linearly polarized laser.

Preferably, coupler 2 is 2 × 2 couplers.

In the present invention, single-frequency seed laser 1 is generating double-side band shift frequency, single-frequency seed after electro-optic phase modulator 4 Transfer function of the laser 1 through electro-optic phase modulator 4 be,

Wherein, V_mFor RF drive, V_πFor half-wave voltage, ω_mFor modulating frequency.

In the present invention, single-frequency seed laser 1 after 4 shift frequency of electro-optic phase modulator power decay, in frequency displacement Low noise optical amplifier 5 is set in feedback control loop, signal compensation can be carried out to the single-frequency seed laser 1 after power attenuation, thus Single-frequency seed laser 1 is set to transmit repeatedly in frequency shift feedback loop.

In the present invention, due to being provided with low noise optical amplifier 5 in frequency shift feedback loop, frequency shift feedback loop is easily sent out It is born from Induced Oscillation and generates mode locking pulse.In order to effectively inhibit spontaneous radiation, narrow band filter is added in frequency shift feedback loop 6, and the passband central frequency of narrow band filter 6 and 1 frequencies omega of single-frequency seed laser₀It is identical, and the middle cardiac wave with spontaneous radiation It is long different.Simultaneously as the mode locking pulse of the loop self-excited generation of frequency shift feedback is usually random polarization state, therefore in narrow-band filtering The online polarizer 7 is set after device 6, make by shift frequency amplify laser pass through the online polarizer 7 again, further suppression loop from Swash.