CN104218438B - Multi-cavity structure optical fiber laser and the method for improving optical fiber laser repetition rate - Google Patents
Multi-cavity structure optical fiber laser and the method for improving optical fiber laser repetition rate Download PDFInfo
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- CN104218438B CN104218438B CN201410448506.9A CN201410448506A CN104218438B CN 104218438 B CN104218438 B CN 104218438B CN 201410448506 A CN201410448506 A CN 201410448506A CN 104218438 B CN104218438 B CN 104218438B
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Abstract
Multi-cavity structure optical fiber laser provided by the invention, realize the pulse output of more than 1GHz repetition rates, it is characterised in that including：Laser amplifier, comprising：Laser amplifier output end and laser amplifier input；Beam splitter, it is connected with the laser amplifier output end of the laser amplifier；At least two locked mode elements, are connected with the beam splitter；At least two delay optical fiber, it is identical with the quantity of the locked mode element, it is connected one by one with the locked mode element respectively, forms at least two branch's light paths；And combiner device, one end are connected with the delay optical fiber, the other end is connected with the laser amplifier input, forms laser loop.
Description
Technical field
It is more particularly to a kind of to improve optical fiber laser repetition rate using multi-cavity structure the present invention relates to laser technology field
Multi-cavity structure optical fiber laser and improve optical fiber laser repetition rate method.
Background technology
High repetition frequency laser has very heavy in laser ranging, laser radar, laser communication, optical frequency com etc.
The application wanted.As high repetition frequency laser ranging has, the target search time is short, positioning precision is high, echo is counted the characteristics of more,
The development of satellite laser ranging (SLR) technology can greatly be promoted.The and for example frequency discrimination interval 10- of high-resolution astronomical echelon
30GHz, the repetition rate of conventional optical frequency com only have 100-500MHz, can not be directly used in the calibration of celestial spectrum instrument
And calibration.Therefore, it is necessary to the repetition rate of the pulse laser of routine is improved one to several orders of magnitude.
In general, shorter laser chamber length correspond to higher repetition rate.Therefore, the weight of laser oscillator is improved
Complex frequency just needs to shorten the geometrical length in laser loop.Either active mode locking laser or laser with active-passive lock mould,
The tail optical fiber length of the length of gain fibre in laser loop, the package dimension of optical fibre device and device is limit fibre laser
Think highly of the principal element that complex frequency further improves.The repetition rate of usual optical fiber laser is generally no greater than 500MHz.It is logical
Cross using integrated optical fibre device, and reduce tail optical fiber length as far as possible to obtain 750MHz pulse output (Optics
Letters,Vol.38,pp314,2013).But it is extremely multiple more than 1GHz, light channel structure further to improve repetition rate at present
Miscellaneous, fused fiber splice and intractability are bigger, and serious forgiveness is lower.
The content of the invention
The present invention is, and it is an object of the present invention to provide a kind of utilize multi-cavity structure, raising weight in order to solving the above problems and carry out
The method of multi-cavity structure optical fiber laser and raising optical fiber laser repetition rate of the complex frequency extremely more than 1GHz.
Multi-cavity structure optical fiber laser provided by the invention, it is characterised in that including：Laser amplifier, comprising：Laser is put
Big output end and laser amplifier input；Beam splitter, it is connected with the laser amplifier output end of laser amplifier；At least two
Locked mode element, is connected with beam splitter；At least two delay optical fiber, it is identical with the quantity of locked mode element, it is first with locked mode respectively
Part connects one by one, forms at least two branch's light paths；And combiner device, one end are connected with delay optical fiber, the other end is with swashing
Light amplification input is connected, and forms laser loop.
Multi-cavity structure optical fiber laser provided by the invention, also has the feature that：Wherein, laser amplifier also wraps
Contain：Optoisolator, laser pumping source, wavelength division multiplexer and gain fibre, optoisolator are multiple with laser pumping source, wavelength-division successively
It is connected with device with gain fibre, the input of optoisolator is as laser amplifier input, the output end conduct of gain fibre
Laser amplifier output end.
Multi-cavity structure optical fiber laser provided by the invention, also has the feature that：Wherein, locked mode element can use
Nonlinear polarization rotation device, polarizing fiber, semiconductor saturable absorber, graphene, CNT etc..
Multi-cavity structure optical fiber laser provided by the invention, also has the feature that：Wherein, gain fibre is doped with dilute
Native ion, rare earth ion can be：Yb3+、Er3+、Tm3+、Ho3+Or Lu3+One kind or combination in.
The method for the raising optical fiber laser repetition rate that the present invention also provides, has steps of：Utilize claim 1
To 4 multi-cavity structure optical fiber lasers, when laser amplifier and first branch's light path form loop, other duplexures are open circuit
When, the first repetition rate f of multi-cavity structure optical fiber laser1Equal to the first longitudinal mode spacing ν of frequency spectrum in laser cavity1, when laser is put
Big device and second branch's light path form loop, when other duplexures are breaking, the second repetition rate f of laser2Equal to sharp
Second longitudinal mode spacing ν of frequency spectrum in optical cavity2, when opening first and second branch's light paths simultaneously, meet νm=q ν1=p ν2(q
Be integer with p) frequency could realize vibration in the optical path, as the first repetition rate f1With the second repetition rate f2Without common divisor,
Total repetition rate is fm=f1×f2=143MHz, when first branch's light path and second branch's light path and the common shape of laser amplifier
During into loop, and the first repetition rate f1With the second repetition rate f2There is common divisor n, total repetition rate is fm'=f1×f2/n。
Invention effect and effect
According to multi-cavity structure optical fiber laser involved in the present invention and the method for improving optical fiber laser repetition rate, utilize
Light path is divided at least two branch's light paths by optical branching device, locked mode element and delay optical fiber, then by optical combiner by branch's light
Road combining, so as to form the pulse of more than 1GHz repetition rates output.Therefore, cavity configuration optical fiber laser of the invention and raising
The method light channel structure of optical fiber laser repetition rate is simple, on the basis of technical difficulty is not increased, is replicated only with light path,
I.e. on the basis of an annular chamber, plus branch's light path part of duplication, so that it may realize carrying for pulse laser repetition rate
It is high.
Brief description of the drawings
Fig. 1 is the structured flowchart that multi-cavity structure of the present invention in embodiment improves optical fiber laser；
Fig. 2 is the structured flowchart of laser amplifier of the present invention in embodiment；
Fig. 3 is nonlinear polarization rotation locked mode component structure block diagram of the present invention in embodiment；And
Fig. 4 is the schematic diagram of multi-cavity structure optical fiber laser longitudinal mode spacing of the present invention in embodiment.
Embodiment
Reality and apply example referring to the drawings climbing robot device involved in the present invention is explained in detail.
Embodiment
Fig. 1 is the structured flowchart that multi-cavity structure of the present invention in embodiment improves optical fiber laser.
As shown in figure 1, multi-cavity structure, which improves optical fiber laser 100, has laser amplifier 10, beam splitter 20, locked mode member
Part 30, delay optical fiber 40 and combiner device 50.
Laser amplifier 10 is the shared light path in loop in multi-cavity structure optical fiber laser, includes laser amplifier output end
With laser amplifier input.
The input of beam splitter 20 is connected to laser amplifier output end, and the ready-made branch's light path of branch is carried out to light path, and
Branch's light path is exported from beam splitting output end respectively.
N number of locked mode element 30 (N ＞ 1), one end and the beam splitting output end of beam splitter 20 connect one to one, and realize single branch
The mode locking pulse output in loop.
N number of delay optical fiber 40 (N ＞ 1), one end connects one to one with locked mode element 30, for adjusting first to N point
The repetition rate in Zhi Guanglu difference laser loop.
Combiner device 50, one end are connected with delay optical fiber 40, and the other end is connected with laser amplifier input so that Mei Gefen
Zhi Guanglu forms a loop.
Fig. 2 is the structured flowchart of laser amplifier of the present invention in embodiment.
As shown in Fig. 2 laser amplifier 10 has：Optoisolator 11, laser pumping source 12, wavelength division multiplexer 13 and gain
Optical fiber 14.
The output end of optoisolator 11 is sequentially connected with the signal input part and gain fibre 14 of wavelength division multiplexer 13.
The output end of laser pumping source 12 is connected with the pumping input of wavelength division multiplexer 13.The input of optoisolator 11
Input as laser amplifier 10.
Output end of the output end of gain fibre 14 as laser amplifier 10, it is dilute doped with rare earth ion gain fibre
Native ion can be：Yb3+、Er3+、Tm3+、Ho3+Or Lu3+One kind or combination in.The wavelength of optics used with it is selected
Doped fiber it is Wavelength matched.
Fig. 3 is nonlinear polarization rotation locked mode component structure block diagram of the present invention in embodiment.
As shown in figure 3, locked mode element 30 can use nonlinear polarization rotation device, polarizing fiber, semiconductor saturable
The mode-locking devices such as absorber, graphene, CNT.Locked mode element 30 in the present embodiment is nonlinear polarization rotation device.
Locked mode element 30 has：First Polarization Controller 31, the Polarization Controller 33 of fiber coupling polarization beam apparatus 32 and second.
First Polarization Controller 31, it is sequentially connected with the Polarization Controller 33 of fiber coupling polarization beam apparatus 32 and second.First
Input of the input of Polarization Controller 31 as locked mode element 30, the output end of the second Polarization Controller 33 is as locked mode member
The output end of part 30, realize the mode locking pulse output of single branch circuit.
Fig. 4 is the schematic diagram of multi-cavity structure optical fiber laser longitudinal mode spacing of the present invention in embodiment.
As shown in figure 4, when the branch's light path formation loop of laser amplifier 10 and first, when other duplexures are breaking,
The repetition rate f of laser1Equal to the longitudinal mode spacing ν of frequency spectrum in laser cavity1.When the branch's light path shape of laser amplifier 10 and second
Into loop, when other duplexures are breaking, the repetition rate f of laser2Equal to the longitudinal mode spacing ν of frequency spectrum in laser cavity2.When
When opening first and second branch's light paths simultaneously, it is equal to whole loop and adds frequency-selecting function so that meet νm=q ν1=p
ν2The frequency of (q be integer with p) could realize vibration in the optical path.
When the branch's light path formation loop of laser amplifier 10 and first, when other duplexures are breaking, pulse weight is exported
Complex frequency is f1=11MHz；When the branch's light path of laser amplifier 10 and second forms loop, other duplexures are open circuit, defeated
It is f to go out pulse recurrence frequency2=13MHz.When the first and second duplexures and laser amplifier 10 are collectively forming loop, and
f1With f2Without common divisor, the repetition rate f of laser pulsem=f1×f2=143MHz, i.e. repetition rate improve an order of magnitude.This
When, the power output of required laser pumping source 12 also needs accordingly to improve.
Similarly, when the branch's light path formation loop of laser amplifier 10 and first, when other duplexures are breaking, arteries and veins is exported
It is f to rush repetition rate1=110MHz；When the branch's light path of laser amplifier 10 and second forms loop, other duplexures are disconnected
Road, output pulse recurrence frequency are f2=130MHz.When the first and second duplexures and laser amplifier 10 are collectively forming back
Lu Shi, and f1With f2There are common divisor n=10, the repetition rate f of laser pulsem=f1×f2/ n=1.43GHz, i.e. repetition rate are carried
Up to 1.43GHz.
Gain fibre is that can be doped with rare earth ion gain fibre, rare earth ion：Yb3+、Er3+、Tm3+、Ho3+Or Lu3+
One kind or combination in.The wavelength of optics used is Wavelength matched with selected doped fiber.
The effect of embodiment and effect
Multi-cavity structure optical fiber laser and the method for improving optical fiber laser repetition rate, profit according to involved by the present embodiment
Light path is divided at least two branch's light paths with optical branching device, locked mode element and delay optical fiber, then by optical combiner by branch
Light path combining, so as to form the pulse of more than 1GHz repetition rates output.Therefore, cavity configuration optical fiber laser of the invention and carry
The method light channel structure of high optical fiber laser repetition rate is simple, on the basis of technical difficulty is not increased, is answered only with light path
System, i.e., on the basis of an annular chamber, plus branch's light path part of duplication, so that it may realize pulse laser repetition rate
Improve.
Multi-cavity structure optical fiber laser involved by the present embodiment and the method for improving optical fiber laser repetition rate, due to tool
There is nonlinear polarization rotation device, therefore the output of locked mode mode locking pulse can be stably formed.
Multi-cavity structure optical fiber laser involved by the present embodiment and the method for improving optical fiber laser repetition rate, due to tool
There is rare earth ion, therefore there can be gain characteristic by optical fiber.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (4)
1. a kind of method for improving optical fiber laser repetition rate, has steps of：
When laser amplifier and first branch's light path formation loop, when other duplexures are breaking, multi-cavity structure optical-fiber laser
First repetition rate f of device1Equal to the first longitudinal mode spacing ν of frequency spectrum in laser cavity1, when the laser amplifier and the second branch
Light path forms loop, when other duplexures are breaking, the second repetition rate f of the multi-cavity structure optical fiber laser2It is equal to
Second longitudinal mode spacing ν of frequency spectrum in laser cavity2, when opening first and second branch's light paths simultaneously, meet νm=q ν1=p ν2(q
Be integer with p) frequency could realize vibration in the optical path,
As the first repetition rate f1With the second repetition rate f2Without common divisor, total repetition rate is fm=f1×f2=
143MHz, when first branch light path and second branch light path are collectively forming loop with the laser amplifier, and
The first repetition rate f1With the second repetition rate f2There is common divisor n, total repetition rate is fm'=f1×f2/ n,
Wherein, the multi-cavity structure optical fiber laser, has：
The laser amplifier, comprising：Laser amplifier output end and laser amplifier input；
Beam splitter, it is connected with the laser amplifier output end of the laser amplifier；
At least two locked mode elements, are connected with the beam splitter；
At least two delay optical fiber, it is identical with the quantity of the locked mode element, it is connected, forms one by one with the locked mode element respectively
At least two branch's light paths；And
Combiner device, one end are connected with the delay optical fiber, and the other end is connected with the laser amplifier input, forms laser
Device loop.
2. the method according to claim 1 for improving optical fiber laser repetition rate, it is characterised in that：
Wherein, the laser amplifier also includes：Optoisolator, laser pumping source, wavelength division multiplexer and gain fibre,
The optoisolator, it is connected successively with the laser pumping source, the wavelength division multiplexer and the gain fibre, it is described
The input of optoisolator is defeated as the laser amplifier as the laser amplifier input, the output end of the gain fibre
Go out end.
3. the method according to claim 1 for improving optical fiber laser repetition rate, it is characterised in that：
Wherein, the locked mode element is using nonlinear polarization rotation device, polarizing fiber, semiconductor saturable absorber, graphite
Alkene, CNT.
4. the method according to claim 2 for improving optical fiber laser repetition rate, it is characterised in that：
Wherein, the gain fibre is doped with rare earth ion, the rare earth ion：Yb3+、Er3+、Tm3+、Ho3+Or Lu3+In
One kind or combination.
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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 |
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| 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 |
| CN111490444B (en) * | 2020-04-08 | 2022-07-15 | 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 |
| CN114895547B (en) * | 2022-04-06 | 2023-01-17 | 北京大学 | Waveform-adaptive large-dynamic high-precision time measuring instrument and measuring method |
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