CN104218438A - Multi-cavity optical fiber laser and method for increasing repeat frequency of optical fiber laser - Google Patents
Multi-cavity optical fiber laser and method for increasing repeat frequency of optical fiber laser Download PDFInfo
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- CN104218438A CN104218438A CN201410448506.9A CN201410448506A CN104218438A CN 104218438 A CN104218438 A CN 104218438A CN 201410448506 A CN201410448506 A CN 201410448506A CN 104218438 A CN104218438 A CN 104218438A
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Abstract
The invention provides a multi-cavity optical fiber laser which achieves pulse output of repeat frequency more than 1GHz. The multi-cavity optical fiber laser is characterized by comprising a laser amplifier, a beam splitter, at least two mode locking elements, at least two delay optical fibers and a beam combiner, wherein the laser amplifier comprises a laser amplifying output end and laser amplifying input end, the beam splitter is connected with the laser amplifying output end of the laser amplifier, each mode locking element is connected with the beam splitter, the number of the delay optical fibers is identical with that of the mode locking elements, the delay optical fibers are respectively connected with the mode locking elements in a one-to-one manner to form at least two branch light paths, one end of the beam combiner is connected with the delay optical fibers, the other end of the beam combiner is connected with the laser amplifying input end, and a laser loop is formed.
Description
Technical field
The present invention relates to laser technology field, particularly a kind of multi-cavity structure fiber laser utilizing multi-cavity structure to improve fiber laser repetition rate and the method improving fiber laser repetition rate.
Background technology
High repetition frequency laser has very important application in laser ranging, laser radar, laser communication, optical frequency com etc.As the high repetition frequency laser ranging feature that to have that the target search time is short, positioning precision is high, echo is counted many, the development of satellite laser ranging (SLR) technology greatly can be advanced.The and for example frequency discrimination interval 10-30GHz of high-resolution astronomical echelon, the repetition rate of conventional optical frequency com only has 100-500MHz, can not be directly used in calibration and the calibration of celestial spectrum instrument.Therefore, be necessary the repetition rate of the pulse laser of routine to improve one to several order of magnitude.
General, shorter laser chamber is long corresponds to higher repetition rate.Therefore, the repetition rate that improve laser oscillator just needs the geometrical length shortening laser loop.No matter be active mode locking laser or laser with active-passive lock mould, the tail optical fiber length of the length of the gain fibre in laser loop, the package dimension of optical fibre device and device is the principal element that limit fibre laser repetition rate improves further.The repetition rate of normal light fibre laser is for be generally not more than 500MHz.By adopting integrated optical fibre device, and reduce pulse output (Optics Letters, Vol.38, pp314,2013) that tail optical fiber length can obtain 750MHz as far as possible.But will improve repetition rate at present further to more than 1GHz, light channel structure is complicated, fused fiber splice and intractability larger, serious forgiveness is lower.
Summary of the invention
The present invention carries out to solve the problem, and object is to provide one to utilize multi-cavity structure, improve repetition rate to more than 1GHz multi-cavity structure fiber laser and improve the method for fiber laser repetition rate.
Multi-cavity structure fiber laser provided by the invention, is characterized in that, comprising: laser amplifier, comprise: laser amplifier output and laser amplifier input; Beam splitter, is connected with the laser amplifier output of laser amplifier; At least two locked mode elements, are connected with beam splitter; At least two postpone optical fiber, identical with the quantity of locked mode element, be connected one by one respectively, form at least two branch's light paths with locked mode element; And combiner device, one end is connected with delay optical fiber, and the other end is connected with laser amplifier input, forms laser loop.
Multi-cavity structure fiber laser provided by the invention, also there is such feature: wherein, laser amplifier also comprises: optical isolator, laser pumping source, wavelength division multiplexer and gain fibre, optical isolator, be connected with gain fibre with laser pumping source, wavelength division multiplexer successively, the input of optical isolator is as laser amplifier input, and the output of gain fibre is as laser amplifier output.
Multi-cavity structure fiber laser provided by the invention, also has such feature: wherein, and locked mode element can adopt nonlinear polarization rotation device, play polarisation fibre, semiconductor saturable absorber, Graphene, carbon nano-tube etc.
Multi-cavity structure fiber laser provided by the invention, also has such feature: wherein, and gain fibre is doped with rare earth ion, and rare earth ion can be: Yb
3+, Er
3+, Tm
3+, Ho
3+or Lu
3+deng in one or combination.
The method of the raising fiber laser repetition rate that the present invention also provides, there are following steps: utilize claim 1 to 4 multi-cavity structure fiber laser, when laser amplifier and first branch's light path form loop, when other duplexure is open circuit, the first repetition rate f of multi-cavity structure fiber laser
1equal the first longitudinal mode spacing ν of frequency spectrum in laser cavity
1, when laser amplifier and second branch's light path form loop, when other duplexure is open circuit, the second repetition rate f of laser
2equal the second longitudinal mode spacing ν of frequency spectrum in laser cavity
2, when to open first and second branch's light paths simultaneously, meet ν
m=q ν
1=p ν
2the frequency of (q and p is integer) could realize vibration, in the optical path as the first repetition rate f
1with the second repetition rate f
2without common divisor, total repetition rate is f
m=f
1× f
2=143MHz, when first branch's light path and second branch's light path and laser amplifier form loop jointly, and the first repetition rate f
1with the second repetition rate f
2have common divisor n, total repetition rate is f
m'=f
1× f
2/ n.
Invention effect
According to multi-cavity structure fiber laser involved in the present invention and the method improving fiber laser repetition rate, utilize optical branching device, locked mode element and postpone optical fiber and light path is divided at least Liang Ge branch light path, by optical combiner, branch's light path is closed road again, thus the pulse forming more than 1GHz repetition rate exports.Therefore, the method light channel structure of cavity configuration fiber laser of the present invention and raising fiber laser repetition rate is simple, do not increasing on the basis of technical difficulty, light path is only adopted to copy, namely on the basis of an annular chamber, add the branch's light path part copied, just can realize the raising of pulse laser repetition rate.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that the present invention's multi-cavity structure in an embodiment improves fiber laser;
Fig. 2 is the structured flowchart of the present invention's laser amplifier in an embodiment;
Fig. 3 is the present invention's nonlinear polarization rotation locked mode component structure block diagram in an embodiment; And
Fig. 4 is the schematic diagram of the present invention's multi-cavity structure fiber laser longitudinal mode spacing in an embodiment.
Embodiment
Referring to accompanying drawing reality and execute example climbing robot device involved in the present invention is explained in detail.
Embodiment
Fig. 1 is the structured flowchart that the present invention's multi-cavity structure in an embodiment improves fiber laser.
As shown in Figure 1, multi-cavity structure raising fiber laser 100 has laser amplifier 10, beam splitter 20, locked mode element 30, postpones optical fiber 40 and combiner device 50.
Laser amplifier 10 is the total light path in loop in multi-cavity structure fiber laser, includes laser amplifier output and laser amplifier input.
The input of beam splitter 20 is connected to laser amplifier output, carries out shunt ready-made branch light path, and branch's light path exported from beam splitting output respectively light path.
N number of locked mode element 30 (N > 1), the beam splitting output of one end and beam splitter 20 connects one to one, and the mode locking pulse realizing single Zhi Huilu exports.
N number of delay optical fiber 40 (N > 1), one end and locked mode element 30 connect one to one, for adjusting first to the repetition rate in the different laser loop of N branch light path.
Combiner device 50, one end is connected with delay optical fiber 40, and the other end is connected with laser amplifier input, makes each branch light path form a loop.
Fig. 2 is the structured flowchart of the present invention's laser amplifier in an embodiment.
As shown in Figure 2, laser amplifier 10 has: optical isolator 11, laser pumping source 12, wavelength division multiplexer 13 and gain fibre 14.
The output of optical isolator 11 is connected with signal input part and the gain fibre 14 of wavelength division multiplexer 13 in turn.
The output of laser pumping source 12 is connected with the pumping input of wavelength division multiplexer 13.The input of optical isolator 11 is as the input of laser amplifier 10.
The output of gain fibre 14 is as the output of laser amplifier 10, and doped with rare earth ion gain fibre, rare earth ion can be: Yb
3+, Er
3+, Tm
3+, Ho
3+or Lu
3+deng in one or combination.The wavelength of optics used and the Wavelength matched of selected doped fiber.
Fig. 3 is the present invention's nonlinear polarization rotation locked mode component structure block diagram in an embodiment.
As shown in Figure 3, locked mode element 30 can adopt nonlinear polarization rotation device, play the mode-locking device such as polarisation fibre, semiconductor saturable absorber, Graphene, carbon nano-tube.Locked mode element 30 in the present embodiment is nonlinear polarization rotation device.Locked mode element 30 has: the first Polarization Controller 31, coupling fiber polarization beam apparatus 32 and the second Polarization Controller 33.
First Polarization Controller 31, in turn connecting fiber coupling polarization beam apparatus 32 and the second Polarization Controller 33.The input of the first Polarization Controller 31 is as the input of locked mode element 30, and the output of the second Polarization Controller 33 is as the output of locked mode element 30, and the mode locking pulse realizing single Zhi Huilu exports.
Fig. 4 is the schematic diagram of the present invention's multi-cavity structure fiber laser longitudinal mode spacing in an embodiment.
As shown in Figure 4, when laser amplifier 10 and first branch's light path form loop, when other duplexure is open circuit, the repetition rate f of laser
1equal the longitudinal mode spacing ν of frequency spectrum in laser cavity
1.When laser amplifier 10 and second branch's light path form loop, when other duplexure is open circuit, the repetition rate f of laser
2equal the longitudinal mode spacing ν of frequency spectrum in laser cavity
2.When to open first and second branch's light paths simultaneously, equal, for whole loop adds frequency-selecting function, to make to meet ν
m=q ν
1=p ν
2the frequency of (q and p is integer) could realize vibration in the optical path.
When laser amplifier 10 and first branch's light path form loop, when other duplexure is open circuit, output pulse repetition frequency is f
1=11MHz; When laser amplifier 10 and second branch's light path form loop, other duplexure is open circuit, and output pulse repetition frequency is f
2=13MHz.When the first and second duplexures and laser amplifier 10 form loop jointly, and f
1with f
2without common divisor, the repetition rate f of laser pulse
m=f
1× f
2=143MHz, namely repetition rate improves an order of magnitude.Now, the power output of required laser pumping source 12 also needs corresponding raising.
In like manner, when laser amplifier 10 and first branch's light path form loop, when other duplexure is open circuit, output pulse repetition frequency is f
1=110MHz; When laser amplifier 10 and second branch's light path form loop, other duplexure is open circuit, and output pulse repetition frequency is f
2=130MHz.When the first and second duplexures and laser amplifier 10 form loop jointly, and f
1with f
2there is common divisor n=10, the repetition rate f of laser pulse
m=f
1× f
2/ n=1.43GHz, namely repetition rate is increased to 1.43GHz.
Gain fibre is that rare earth ion can be doped with rare earth ion gain fibre: Yb
3+, Er
3+, Tm
3+, Ho
3+or Lu
3+deng in one or combination.The wavelength of optics used and the Wavelength matched of selected doped fiber.
The effect of embodiment and effect
The method of multi-cavity structure fiber laser and raising fiber laser repetition rate involved by the present embodiment, utilize optical branching device, locked mode element and postpone optical fiber and light path is divided at least Liang Ge branch light path, by optical combiner, branch's light path is closed road again, thus the pulse forming more than 1GHz repetition rate exports.Therefore, the method light channel structure of cavity configuration fiber laser of the present invention and raising fiber laser repetition rate is simple, do not increasing on the basis of technical difficulty, light path is only adopted to copy, namely on the basis of an annular chamber, add the branch's light path part copied, just can realize the raising of pulse laser repetition rate.
The method of multi-cavity structure fiber laser involved by the present embodiment and raising fiber laser repetition rate, owing to having nonlinear polarization rotation device, exports therefore, it is possible to stably form locked mode mode locking pulse.
The method of multi-cavity structure fiber laser involved by the present embodiment and raising fiber laser repetition rate, owing to having rare earth ion, therefore, it is possible to by making optical fiber have gain characteristic.
Above-mentioned execution mode is preferred case of the present invention, is not used for limiting the scope of the invention.
Claims (5)
1. a multi-cavity structure fiber laser, is characterized in that, comprising:
Laser amplifier, comprises: laser amplifier output and laser amplifier input;
Beam splitter, is connected with the described laser amplifier output of described laser amplifier;
At least two locked mode elements, are connected with described beam splitter;
At least two postpone optical fiber, identical with the quantity of described locked mode element, be connected one by one respectively, form at least two branch's light paths with described locked mode element; And
Combiner device, one end is connected with described delay optical fiber, and the other end is connected with described laser amplifier input, forms laser loop.
2. multi-cavity structure fiber laser according to claim 1, is characterized in that:
Wherein, described laser amplifier also comprises: optical isolator, laser pumping source, wavelength division multiplexer and gain fibre,
Described optical isolator, is connected with described gain fibre with described laser pumping source, described wavelength division multiplexer successively, and the input of described optical isolator is as described laser amplifier input, and the output of described gain fibre is as described laser amplifier output.
3. multi-cavity structure fiber laser according to claim 1, is characterized in that:
Wherein, described locked mode element can adopt nonlinear polarization rotation device, play polarisation fibre, semiconductor saturable absorber, Graphene, carbon nano-tube etc.
4. multi-cavity structure fiber laser according to claim 2, is characterized in that:
Wherein, described gain fibre is doped with described rare earth ion, and rare earth ion can be: Yb
3+, Er
3+, Tm
3+, Ho
3+or Lu
3+deng in one or combination.
5. improve a method for fiber laser repetition rate, there are following steps:
Utilize multi-cavity structure fiber laser described in claim 1 to 4,
When described laser amplifier and first branch's light path form loop, when other duplexure is open circuit, the first repetition rate f of described multi-cavity structure fiber laser
1equal the first longitudinal mode spacing ν of frequency spectrum in laser cavity
1, when laser amplifier and second branch's light path form loop, when other duplexure is open circuit, the second repetition rate f of laser
2equal the second longitudinal mode spacing ν of frequency spectrum in laser cavity
2, when to open first and second branch's light paths simultaneously, meet ν
m=q ν
1=p ν
2the frequency of (q and p is integer) could realize vibration in the optical path,
As described first repetition rate f
1with described second repetition rate f
2without common divisor, total repetition rate is f
m=f
1× f
2=143MHz, when described first branch's light path and second branch's light path and described laser amplifier form loop jointly, and the first repetition rate f
1with described second repetition rate f
2have common divisor n, described total repetition rate is f
m'=f
1× f
2/ n.
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| CN105356218A (en) * | 2015-11-27 | 2016-02-24 | 天津欧泰激光科技有限公司 | Low-loss high repetitive frequency laser pulse modulator |
| CN105762631A (en) * | 2016-04-29 | 2016-07-13 | 武汉虹拓新技术有限责任公司 | Method and device for improving repetition frequency of laser |
| CN106058621A (en) * | 2016-06-21 | 2016-10-26 | 上海理工大学 | Adjustable picosecond laser |
| CN107045207A (en) * | 2017-06-07 | 2017-08-15 | 中国科学院半导体研究所 | Train of pulse produces the structure controlled with time domain pattern |
| CN110277724A (en) * | 2019-06-25 | 2019-09-24 | 中国人民解放军军事科学院国防科技创新研究院 | A kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source |
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| KR0150486B1 (en) * | 1994-12-07 | 1998-12-01 | 양승택 | A wavelength tunable multi-wavelength fiber laser scheme using a single laser pump |
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| CN105762631A (en) * | 2016-04-29 | 2016-07-13 | 武汉虹拓新技术有限责任公司 | Method and device for improving repetition frequency of laser |
| CN106058621A (en) * | 2016-06-21 | 2016-10-26 | 上海理工大学 | Adjustable picosecond laser |
| CN107045207A (en) * | 2017-06-07 | 2017-08-15 | 中国科学院半导体研究所 | Train of pulse produces the structure controlled with time domain pattern |
| CN110277724A (en) * | 2019-06-25 | 2019-09-24 | 中国人民解放军军事科学院国防科技创新研究院 | A kind of adjustable high repetition frequency single-chamber bicoherence optical frequency com light source |
| CN110277724B (en) * | 2019-06-25 | 2021-01-08 | 中国人民解放军军事科学院国防科技创新研究院 | Adjustable high-repetition-frequency single-cavity double-phase-dry optical frequency comb light source |
| CN110620324A (en) * | 2019-10-14 | 2019-12-27 | 华东师范大学重庆研究院 | Rational number resonance multi-wavelength coding method for dynamically adjusting Q |
| CN110620324B (en) * | 2019-10-14 | 2021-08-31 | 华东师范大学重庆研究院 | Rational number resonance multi-wavelength coding method for dynamically adjusting Q |
| CN111490444A (en) * | 2020-04-08 | 2020-08-04 | 武汉光迅科技股份有限公司 | Pulse optical fiber amplifier and optical signal power amplification method |
| CN114268007A (en) * | 2021-12-22 | 2022-04-01 | 中国地质大学（武汉） | Bidirectional mode-locked fiber laser for generating double optical combs |
| CN114895547A (en) * | 2022-04-06 | 2022-08-12 | 北京大学 | Waveform-adaptive large-dynamic high-precision time measuring instrument and measuring method |
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