CN102263356B - Single-frequency narrow linewidth polarization-maintaining all-fiber pulse laser - Google Patents
Single-frequency narrow linewidth polarization-maintaining all-fiber pulse laser Download PDFInfo
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Abstract
The utility model provides a narrow linewidth of single-frequency polarization-maintaining all-fiber pulse laser, includes continuous single-frequency seed source laser, follows continuous single-frequency seed source laser output beam's propagation direction be in proper order: the output end of the pulse time sequence control signal source is respectively connected with the time sequence control ends of the first acousto-optic modulator, the second acousto-optic modulator and the third large mode field double-clad optical fiber amplifier. The invention has the characteristics of simple structure, adjustable laser repetition frequency and pulse width, high efficiency, good single-frequency performance and good beam quality.
Description
Technical field
The present invention relates to pulse optical fiber, particularly a kind of single-frequency narrow line width polarization maintaining full-optical fiber pulse laser.
Technical background
Single-frequency linear polarization pulse laser has important application prospect in fields such as remote sensing technology, spectral technique, coherent laser radar detection and coherent communications.In these fields, often require laser linewidth below 10MHz, for the pulse repetition different requirements are arranged also simultaneously.In the prior art, seed inject the solid single frequency laser use more [referring to S.W.Henderson, E.H.Yuen, and E.S.Fry, Opt.Lett, Vol.11, No.11, pp.715 (1986)], this laser Output of laser energy is larger, but its pulsewidth generally narrower, repetition is lower, live width about tens of MHz to hundred MHz, particularly control system is complicated, is unfavorable for steady in a long-term the application.
Summary of the invention
The present invention is intended to overcome above-mentioned the deficiencies in the prior art, and a kind of single-frequency narrow line width polarization maintaining full-optical fiber pulse laser is provided, and this laser has that all optical fibre structure, repetition rate and pulsewidth are adjustable, spectral signal-noise ratio is high, the characteristics such as compact conformation.
Technical solution of the present invention is as follows:
A kind of single-frequency narrow line width polarization maintaining full-optical fiber pulse laser, comprise continuous single-frequency seed source laser, its characteristics are: first sound-optic modulator, first order monomode fiber amplifier, the first separation filter, second level monomode fiber amplifier, second sound-optic modulator, the second separation filter, the large mould area double-cladding of third level fiber amplifier, the output in pulse sequence control signal source respectively with described first sound-optic modulator, second sound-optic modulator links to each other with the sequencing control end of the large mould area double-cladding of third level fiber amplifier, provide the electric impulse signal of special time relation, control described first sound-optic modulator, the operating time of the large mould area double-cladding of second sound-optic modulator and third level fiber amplifier.
Laser linewidth＜the 10MHz of described continuous single-frequency seed source laser.
The gain fibre of described first order monomode fiber amplifier and second level monomode fiber amplifier is that single mode is protected inclined to one side gain fibre, and the gain fibre of the large mould area double-cladding of described third level fiber amplifier is that large mould area double-cladding is protected inclined to one side gain fibre.
Obtain pulse train by first sound-optic modulator modulation continuous laser, obtain again the power amplification output of high-gain by two-stage monomode fiber amplifier, obtain high pulse energy by large mould area double-cladding fiber amplifier at last and amplify output.Inter-stage adopts separation filter to reduce nonlinear effect and ASE effect, and second sound-optic modulator also can change laser pulse frequency when further reducing the amplified spontaneous emission effect.
Described first sound-optic modulator and second sound-optic modulator are for to carry out synchronously sequencing control by the signal of telecommunication, the signal of telecommunication that the output of pulse sequence control signal source has the special time relation is loaded into respectively on the driving power of described first sound-optic modulator and second sound-optic modulator, and driving power is exported the switch of corresponding ping guide sound optical modulator.Thereby so that second sound-optic modulator can carry out selection of time to the pulse train that first sound-optic modulator produces, allow laser pulse pass through, and when no pulse, stop amplified spontaneous emission light, also can select by whether laser pulse simultaneously, thereby change laser pulse frequency.
The large mould area double-cladding of described third level fiber amplifier is when being applied to low recurrent frequency pulse laser output, adopt the pulse pump mode, the control signal of the output of pulse sequence control signal source and acousto-optic modulator has the switching time of the signal of telecommunication control pumping of special time relation, to improve efficiency of pump utilization and to reduce amplified spontaneous emission.
Described single mode gain fibre is all the high inclined to one side gain fibre of guarantor that absorbs with large mould area double-cladding gain fibre, and the output end face of large mould area double-cladding optical fiber is the inclined-plane.
Technique effect of the present invention:
The present invention utilizes the optical fiber laser amplifier structure of high-gain to obtain the output of high-octane single mode narrow linewidth pulse laser, adopts three grades of structure for amplifying of different gains optical fiber to make the optical fiber laser amplifier can high efficiency output high energy pulse.Amplifier stage adopts separation filter greatly to reduce nonlinear effect and ASE effect.Adopting two acousto-optic modulators to be used has not only further reduced the amplified spontaneous emission effect but also can control more flexibly laser pulse width and frequency, thereby make output laser pulse repetition and pulsewidth all adjustable, and improved the single-frequency performance of laser, make whole amplifier architecture simple, be easy to control, adapt to the different application occasion.
Description of drawings
Fig. 1 is single-frequency narrow line width polarization maintaining full-optical fiber pulse laser structural representation of the present invention;
Fig. 2 is first sound-optic modulator in the single-frequency narrow line width polarization maintaining full-optical fiber pulse laser of the present invention, and second sound-optic modulator and the third level are amplified the control impuls timing diagram when adopting pulse pump
Fig. 3 is monomode fiber amplifier architecture figure of the present invention
Fig. 4 is the large mould area double-cladding of the present invention fiber amplifier structure chart
Among the figure: the continuous single-frequency seed source laser of 1-, the 2-first sound-optic modulator, 3-first order monomode fiber amplifier, 4-the first filtering isolator, 5-second level monomode fiber amplifier, the 6-second sound-optic modulator, 7-the second filtering isolator, the large mould area double-cladding of 8-fiber amplifier, 9-pulse sequence control signal source, 301-single-mode tail fiber coupling pumping source, 302-wavelength division multiplexer (WDM), the 303-single mode is protected inclined to one side gain fibre, 801-multimode pigtail coupling pumping source, the 802-pump combiner, 803-is large, and the mould area double-cladding is protected inclined to one side gain fibre.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1, Fig. 1 is single-frequency narrow line width polarization maintaining full-optical fiber pulse laser structural representation of the present invention.As seen from the figure, single-frequency narrow line width polarization maintaining full-optical fiber pulse laser of the present invention, comprise continuous single-frequency seed source laser 1, the direction of propagation along described continuous single-frequency seed source laser 1 output beam is successively: first sound-optic modulator 2, first order monomode fiber amplifier 3, the first separation filter 4, second level monomode fiber amplifier 5, second sound-optic modulator 6, the second separation filter 7, the large mould area double-cladding of third level fiber amplifier 8, the output in pulse sequence control signal source 9 respectively with described first sound-optic modulator 2, second sound-optic modulator 6 links to each other with the sequencing control end of the large mould area double-cladding of third level fiber amplifier 8, provide the electric impulse signal of special time relation, control described first sound-optic modulator 2, the operating time of the large mould area double-cladding of second sound-optic modulator 6 and third level fiber amplifier 8.
Described continuous single-frequency seed source laser 1 produces pulse train by first sound-optic modulator 2, after amplifying, first order monomode fiber amplifier 3 carries out isolation filter by 4 pairs of amplifying lasers of the first separation filter, and then further amplify through second level monomode fiber amplifier 5, and carry out again acoustooptic modulation by second sound-optic modulator 6, carry out isolation filter through the second separation filter 7 afterwards, and finally amplify output by the large mould area double-cladding of third level fiber amplifier 8, pulse sequence control signal source 9 provides the electric impulse signal with special time relation, controls described first sound-optic modulator 2, the operating time of the third level amplifier when second sound-optic modulator 6 and employing pulse pump.Fig. 2 is first sound-optic modulator, second sound-optic modulator and the third level are amplified the control impuls timing diagram when adopting pulse pump, Fig. 3 is monomode fiber amplifier architecture figure, 301-single-mode tail fiber coupling pumping source, 302-wavelength division multiplexer (WDM), the 303-single mode is protected inclined to one side gain fibre, and Fig. 4 is large mould area double-cladding fiber amplifier structure chart.801-multimode pigtail coupling pumping source, the 802-pump combiner, 803-is large, and the mould area double-cladding is protected inclined to one side gain fibre.
The below lifts a specific embodiment and is described below:
As shown in Figure 1, centre wavelength is 1064nm, the seed source laser 1 of output single-frequency continuous laser, produce repetition 10KHz by first sound-optic modulator 2, the pulse train of pulsewidth 500ns, protect the amplifier 3 that inclined to one side Yb dosed optical fiber consists of via the two-stage single mode, after 5, select pulse to produce repetition 100Hz by second sound-optic modulator 6, the pulse train of pulsewidth 500ns, the large mould area double-cladding of afterbody fiber amplifier 8 adopts core diameter 25 μ m (NA=0.06), inner cladding diameter 250 μ m (NA=0.46), the large mould area double-cladding optical fiber of doping ytterbium ion in the fibre core, obtain pulse energy and surpass 100 μ J, the amplification output of polarization extinction ratio＞14dB.
In sum, experiment shows that the present invention compares with technology formerly, characteristics simple in structure, that be easy to control that single-frequency narrow line width polarization maintaining full-optical fiber pulse laser of the present invention has, its pulse repetition frequency and pulse duration are adjustable simultaneously, the linear polarization pulse laser of output narrow linewidth, high-peak power has improved lasing efficiency greatly.
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| CN103050874A (en) * | 2013-01-16 | 2013-04-17 | 山东海富光子科技股份有限公司 | High-power pulse type singe-frequency all-fiber laser system |
| CN104332810A (en) * | 2014-08-25 | 2015-02-04 | 深圳市创鑫激光技术有限公司 | Pulse-width-adjustable pulsed optical fiber laser device based on broadband seed resource |
| CN104253371A (en) * | 2014-08-25 | 2014-12-31 | 深圳市创鑫激光技术有限公司 | Ultra-broadband light source-based pulse width-adjustable pulse fiber laser |
| CN105244747A (en) * | 2015-09-23 | 2016-01-13 | 中国工程物理研究院应用电子学研究所 | High-energy long pulse laser obtaining device, method and application |
| CN106356703B (en) * | 2016-09-09 | 2018-11-20 | 中国科学院上海光学精密机械研究所 | The laser seed source system based on single polarisation transfer optical fiber of highly resistance perturbation |
| CN110957626A (en) * | 2019-12-18 | 2020-04-03 | 株洲菲斯罗克光电技术有限公司 | Spectral rotary mirror and hybrid integrated microminiature ASE light source device |
| CN112531451A (en) * | 2020-11-02 | 2021-03-19 | 深圳市圭华智能科技有限公司 | Laser time domain synchronous control system |
| CN112636149B (en) * | 2020-11-08 | 2023-04-07 | 罗根激光科技（武汉）有限公司 | mJ power amplifier suitable for 1064nm subnanosecond pulse |
| CN112490840A (en) * | 2020-11-26 | 2021-03-12 | 浙江热刺激光技术有限公司 | System and method for inhibiting continuous components in laser pulse traveling wave amplification process |
| CN112731351A (en) * | 2020-12-29 | 2021-04-30 | 中国电子科技集团公司第二十六研究所 | Acousto-optic Doppler detector and control method thereof |
| CN115102020B (en) * | 2022-07-14 | 2025-11-07 | 杭州奥创光子技术有限公司 | Pulse laser output control device and control method |
| CN116435859B (en) * | 2023-05-23 | 2024-03-29 | 上海科乃特激光科技有限公司 | Pulse fiber laser system |
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| US20080089366A1 (en) * | 2006-05-15 | 2008-04-17 | Polaronyx, Inc. | High energy short pulse fiber laser achieved by combining pulse shaping, polarization shaping and spectral shaping |
| FR2909229B1 (en) * | 2006-11-27 | 2009-02-06 | Centre Nat Rech Scient | LASER SYSTEM WITH PICOSECOND IMPULSE TRANSMISSION. |
| CN201044323Y (en) * | 2007-04-27 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Single longitudinal mode Q-switched laser with driven cavity length control |
| CN101950917A (en) * | 2010-08-25 | 2011-01-19 | 中国科学院上海光学精密机械研究所 | All-solid-state 455nm pulse laser based on neodymium-doped lithium lutetium fluoride crystal |
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Denomination of invention: Single frequency narrow linewidth polarization maintaining all fiber pulsed laser Effective date of registration: 20210401 Granted publication date: 20131030 Pledgee: Bank of China Limited Nanjing Gulou Branch Pledgor: NANJING MOVELASER TECHNOLOGY Co.,Ltd. Registration number: Y2021980002371 |
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