CN103825177B - A kind of pulse full polarization fibre laser based on multiple non-linear amplification annular mirrors - Google Patents
A kind of pulse full polarization fibre laser based on multiple non-linear amplification annular mirrors Download PDFInfo
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- CN103825177B CN103825177B CN201410093188.9A CN201410093188A CN103825177B CN 103825177 B CN103825177 B CN 103825177B CN 201410093188 A CN201410093188 A CN 201410093188A CN 103825177 B CN103825177 B CN 103825177B
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- 229910052691 Erbium Inorganic materials 0.000 description 1
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- 229910052777 Praseodymium Inorganic materials 0.000 description 1
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Abstract
The invention discloses a kind of pulse full polarization fibre laser based on multiple non-linear amplification annular mirrors, it includes main oscillations chamber, prime non-linear amplification annular mirror chamber and the one or more non-linear amplification annular mirror chamber of rear class, in laser instrument, light field is propagated clockwise, pass sequentially through described main oscillations chamber, prime non-linear amplification annular mirror chamber, the one or more non-linear amplification annular mirror chamber of rear class and main oscillations chamber, form closed loop chamber；In main oscillations chamber, the relatively low one end of beam splitter splitting ratio is as the output of laser instrument.The main oscillations chamber of the present invention provides main gain, stable pulse and controls optical path direction, and multiple non-linear amplification annular mirror chambeies are divided into prime and rear class, it is achieved locked mode self-starting.Multiple annular mirror chambeies can effectively suppress amplitude noise, stable mode-locking, weakens pulse division, is more easy to locked mode, reduce modelocking threshold, eliminates small-pulse effect before and after pulse, and narrow pulse.By regulating each annular mirror optical fiber model, length and pumping light power, different repetition rate, pulse width, the output of the isoparametric guarantor of power extreme light can be realized.
Description
Technical field
The invention belongs to ultra-fast optical, laser technology field, relate to a kind of based on multiple non-linear amplification annular mirror chambeies work
Pulse full polarization fibre laser.
Background technology
Optical fiber laser is the third generation new laser after traditional gas laser instrument and solid state laser, has structure
The advantages such as compact, life-span length, non-maintaining, good beam quality, energy-conserving and environment-protective, the pulse of pulse optical fiber therein is narrow, peak
Value power is high, without outstanding advantages such as water-cooleds, be one of direction, forward position, current optoelectronic information field.
Pulse optical fiber has that gain characteristic is good, action time is short, output beam quality good, volume is little, use is clever
The features such as alive and optical fiber telecommunications system is easy to connect, at materials processing, medical treatment, laser chemistry, high-energy physics, accurate meter
Amount field has been obtained for extensively applying.At present, the locked mode mode that pulse optical fiber is conventional has polarization to rotate passive mode-locking
With saturable absorption locked mode.But there are some defects in them: polarization rotates the modelocking threshold height of locked mode, the non-guarantor of optical fiber partially,
Mode-lock status is easily by external interference, and temperature change and mechanical oscillation etc. can cause mode-lock status shakiness even losing lock, and pulse does not has
Long-time stability, pulse train modulation relatively big, be difficult to locked mode self-starting；Saturable absorption locked mode can with self-starting, but arteries and veins
Punching easily division, strong noise, the peak power of pulse laser is the highest simultaneously, and saturated absorption bulk diffusion threshold value is low, is not suitable for Gao Gong
Rate and long-time mode-lock status.
Meanwhile, the polarization characteristic of laser instrument is had and strictly wants by the field such as optical fibre gyro, Fibre Optical Sensor, fiber optic communication external modulation
Ask.Inclined output protected by laser instrument also becomes a research emphasis.Polarization rotates passive mode-locking and saturable absorption locked mode is the most all adopted
Device with band non PM fiber, it is possible to obtain more steady power output, but output polarization state is disorderly.Therefore, high stability, low
Modelocking threshold, work long hours, the research and development of pulse full-fiber laser of polarised light output extremely the most urgent.
In recent years, non-linear amplification annular mirror Mould locking machine prepares extensively attention.It is in self-starting, stability and long-time
Outstanding performance in terms of work has attracted the continuous research of each research group domestic and international.Its principle is similar to saturated absorption lock
Mould, but structure uses all-fiber to realize.The most ripe along with protecting inclined doped fiber technology, all risk insurance is the most non-linear amplifies annular
Mirror locked mode is achieved, high stable, easy self-starting, work long hours while can realize polarised light output.But simultaneously
There is also the deficiency being difficult to avoid that: owing to only one of which amplifies annular mirror, pulse is wider and unsmooth；The most single non-linear put
There is certain amplitude noise etc. unavoidably in big annular mirror.These deficiencies all limit the application of this method.
Summary of the invention
In place of it is an object of the invention to for above-mentioned the deficiencies in the prior art, propose a kind of based on multiple (two and more than)
The pulse full polarization fibre laser of non-linear amplification annular mirror, this pulse full polarization fibre laser utilizes multiple non-linear put
The cascade of big annular mirror chamber, effectively suppresses amplitude noise, stable mode-locking, weakens pulse division, is more easy to locked mode, reduces modelocking threshold,
Eliminating small-pulse effect before and after pulse, narrow pulse.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that
A kind of new laser based on multiple non-linear amplification annular mirror chambeies, including main oscillations chamber, prime is non-linear puts
Big annular mirror chamber, the one or more non-linear amplification annular mirror chamber of rear class；In laser instrument, light field is propagated clockwise, passes sequentially through institute
State main oscillations chamber, prime non-linear amplification annular mirror chamber, the one or more non-linear amplification annular mirror chamber of rear class, main oscillations chamber,
Form closed loop chamber；In main oscillations chamber, the relatively low one end of beam splitter splitting ratio is as the output of laser instrument.
Described main oscillations chamber includes fiber optic splitter, optical fiber filter, semiconductor laser, pump combiner, gain
Optical fiber, fibre optic isolater；Semiconductor laser connects the pumping input of pump combiner, and the common port of pump combiner connects
Gain fibre, the output light of gain fibre enters prime non-linear amplification annular mirror chamber by fibre optic isolater, and prime is non-linear
The output amplifying annular mirror chamber enters the one or more non-linear amplification annular mirror chamber of rear class, output by fibre optic isolater again
End connects fiber optic splitter common port, and the relatively low one end of fiber optic splitter splitting ratio is as the output of laser instrument, and the other end passes through
Optical fiber filter connects the signal end of pump combiner, forms closed loop chamber.
The quantity of described fibre optic isolater and the quantity in non-linear amplification annular mirror chamber are equal, each fibre optic isolater
Rear end connected nonlinearity amplifies annular mirror chamber.
Described non-linear amplification annular mirror chamber includes prime non-linear amplification annular mirror chamber, the one or more non-thread of rear class
Property amplify annular mirror chamber；All non-linear amplification annular mirror cavity configurations are consistent, can multi-stage cascade, each non-linear amplification annular mirror
Interacvity gain optical fiber and high non-linearity phase place fiber lengths is equal or.
Described high non-linearity phase place optical fiber is little spot size single-mode fiber or multimode fibre.
Described non-linear amplification annular mirror chamber connects 2 × 2 beam splitter outputs, 2 × 2 beam splitter splitting ratios be 60:40,
50:50,55:45, or be other splitting ratios.
Described gain fibre is the same with the gain fibre type in main oscillations chamber, for the one in doped with rare-earth elements or
Multiple mix
Single-mode fiber, big core diameter multimode fibre, doubly clad optical fiber or photonic crystal fiber.
Described main oscillations chamber, non-linear amplification annular mirror chamber except all devices of high non-linearity phase place optical fiber are all
The inclined device of all risk insurance.
Compared with prior art, the invention have the advantages that
1, the multiple non-linear amplification annular mirror chamber that the present invention uses, polarization of laser output state fixes, and linear polarization can be transported
It is used in the nonlinear optics such as frequency multiplication and frequency, many special dimensions such as bio-imaging and accurate measurement.
2, the multiple non-linear amplification annular mirror chamber that the present invention uses, beneficially locked mode self-starting, reduces self-starting threshold value.
3, the multiple non-linear amplification annular mirror chamber extensible number that the present invention uses, each non-linear amplification annular mirror chamber
The device length such as gain fibre and high non-linearity phase place optical fiber are variable, and adjustable parameter is many, and flexibility is big.
4, the multiple non-linear amplification annular mirror chamber that the present invention uses, easily establishes locked mode, and modelocking threshold is low.
5, the multiple non-linear amplification annular mirror chamber that the present invention uses repeatedly slackens edge before and after pulse, and narrow pulse,
6, output pulse stability is high, and regulation chamber intrinsic parameter can realize the output of nanosecond, psec or femtosecond pulse.
7, the multiple non-linear amplification annular mirror chamber that the present invention uses is suitable for different-waveband and the generation of multiband pulse,
Different doped with rare-earth elements (ytterbium, erbium, thulium, holmium, praseodymium etc.) gain fibre, the pulse laser of output different-waveband can be used.
8, the device that the present invention uses is all to protect inclined device, and total system antijamming capability is strong, has high stability.
9, the present invention uses all optical fibre structure, and laser dimensions is little, lightweight, integrability.
Accompanying drawing explanation
Fig. 1 is present configuration block diagram；
Fig. 2 is present invention structural representation based on two identical non-linear amplification annular mirror chambeies；
Fig. 3 is present invention structural representation based on two difference non-linear amplification annular mirror chambeies；
Fig. 4 is present invention structural representation based on three identical non-linear amplification annular mirror chambeies.
Detailed description of the invention
Feature of present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, in order to
Understanding in technical staff of the same trade:
Such as Fig. 1, the present invention includes that main oscillations chamber 000, prime non-linear amplification annular mirror chamber 100, rear class are one or more
Non-linear amplification annular mirror chamber 200,300 ..., in it, light field is propagated clockwise, passes sequentially through described main oscillations chamber 000, prime
Non-linear amplification annular mirror chamber 100, the one or more non-linear amplification annular mirror chamber 200 of rear class, 300 ..., main oscillations chamber 000,
Form closed loop chamber；Pulse is divided into two-way after entering non-linear amplification annular mirror chamber, due to two-way light experience gain fibre and Gao Fei
The order of linear phase optical fiber is different and produces phase difference, is then transferred back at 2 × 2 beam splitters interfering, pulse power
Height determine phase place extent, determine through 2 × 2 beam splitters output branch, the most non-linear amplification annular mirror chamber permit
Being permitted high power pulse clockwise transmission, low powder pulsed former road is put back to, counterclockwise transmission, plays the effect of screening pulse power；
First, prime non-linear amplification annular mirror chamber 100 screens the pulse that amplitude is higher, then, relatively Gao Gong in random fluctuation pulse
Rate pulse by the one or more non-linear amplification annular mirror chamber 200 of rear class, 300 ... slacken step by step pulse both sides sideband and
Small-pulse effect, plays the effect of the pulse that narrows, and secondly, single prime non-linear amplification annular mirror chamber easily causes certain amplitude to make an uproar
Sound also can be eliminated behind non-linear amplification annular mirror chambeies one or more by rear class, and meanwhile, the pulse of division also can be led to
Cross multiple non-linear amplification annular mirror chamber and slacken amplitude relatively lower part shaped pulse again, finally, multiple non-linear amplification annulars
Mirror chamber acts on simultaneously, can be easier to screen high power pulse faster and realize locked mode.Therefore, multiple annular mirror chambeies can effectively suppress
Amplitude noise, stable mode-locking, weakens pulse division, is more easy to locked mode, reduce modelocking threshold, eliminate small-pulse effect before and after pulse, narrow
Pulse.By regulating each annular mirror optical fiber model, length and pumping light power, different repetition rate, pulse width can be realized
The output of degree, the isoparametric guarantor of power extreme light.
Embodiment 1
Refering to Fig. 2, the present embodiment is a kind of new laser based on two identical non-linear amplification annular mirror chambeies, its bag
Include identical non-linear amplification annular mirror chamber 100,200,000, two, main oscillations chamber.Main oscillations chamber includes fiber optic splitter 001, light
Fiber filter 002, semiconductor laser 003, pump combiner 004, mix 005, two fibre optic isolaters 006 of ytterbium gain fibre,
007.The preferred 8:2 of fiber optic splitter 001 splitting ratio, the preferred 1064nm of optical fiber filter 002 operation wavelength, wavelength bandwidth preferably ±
1nm, semiconductor kistributed-feedback laser 003 operation wavelength is preferably 976nm, mixes the ytterbium gain fibre 005 preferred 2m of length.Non-linear amplification annular
Mirror chamber include semiconductor laser 101,201, pump combiner 102,202, mix ytterbium gain fibre 103,203, high non-linearity phase
Position optical fiber 104,204,2 × 2 beam splitter 105,205.Semiconductor kistributed-feedback laser 101,201 operation wavelength is preferably 976nm, mixes ytterbium gain
Optical fiber 103, the 203 preferred 1m of length, high non-linearity phase place optical fiber 104,204 length is consistent, adjustable length, 2 × 2 beam splitters 105,
The 205 preferred 60:40 of splitting ratio, one end that splitting ratio is high connects pump combiner 102,202.
Semiconductor laser 003 output connects the pumping input of pump combiner 004, the public affairs of pump combiner 004
Ytterbium gain fibre 005 is mixed in end connection altogether, and the output light mixing ytterbium gain fibre 005 enters prime non-thread by fibre optic isolater 006
Property amplify annular mirror chamber 100, the output in prime non-linear amplification annular mirror chamber 100 again by fibre optic isolater 007 enter after
The non-linear amplification annular mirror chamber 200 of level, rear class non-linear amplification annular mirror chamber 200 output connects fiber optic splitter common port,
The relatively low one end of fiber optic splitter 001 splitting ratio connects pumping as the output of laser instrument, the other end by optical fiber filter 003
The signal end of bundling device 004, forms closed loop chamber.Main oscillations chamber provides main gain, and ensures that light runs clockwise, prime non-thread
Property amplify annular mirror chamber 100 in random fluctuation pulse, first screen the higher pulse of amplitude, then put by rear class is non-linear
Big annular mirror chamber 200 narrows pulse, and multiple annular mirror chambeies can effectively suppress amplitude noise, stable mode-locking, weakens pulse division, more
Easily locked mode, reduces modelocking threshold, eliminates small-pulse effect before and after pulse, and narrow pulse.Finally, fiber optic splitter 001 splitting ratio is relatively low
The linear polarization mode locking pulse that one end output is stable.
Embodiment 2
Refering to Fig. 3, the present embodiment is a kind of new laser based on two difference non-linear amplification annular mirror chambeies, its bag
Include difference non-linear amplification annular mirror chamber 100,200,000, two, main oscillations chamber.Main oscillations chamber includes fiber optic splitter 001, light
Fiber filter 002, semiconductor laser 003, pump combiner 004, mix 005, two fibre optic isolaters 006 of ytterbium gain fibre,
007.The preferred 8:2 of fiber optic splitter 001 splitting ratio, the preferred 1064nm of optical fiber filter 002 operation wavelength, wavelength bandwidth preferably ±
1nm, semiconductor kistributed-feedback laser 003 operation wavelength is preferably 976nm, mixes the ytterbium gain fibre 005 preferred 2m of length.Non-linear amplification annular
Mirror chamber include semiconductor laser 101,201, pump combiner 102,202, mix ytterbium gain fibre 103,203, high non-linearity phase
Position optical fiber 104,204,2 × 2 beam splitter 105,205.Semiconductor kistributed-feedback laser 101,201 operation wavelength is preferably 976nm, partly leads laser
Device 201 power is bigger than semiconductor kistributed-feedback laser 101 power, mixes the ytterbium gain fibre 103 preferred 1m of length, mixes ytterbium gain fibre 203 length
Preferably 1.5m, high non-linearity phase place optical fiber 204 is longer than high non-linearity phase place optical fiber 104, adjustable length, 2 × 2 beam splitters 105,
The 205 preferred 60:40 of splitting ratio, one end that splitting ratio is high connects pump combiner 102,202.
Semiconductor laser 003 output connects the pumping input of pump combiner 004, the public affairs of pump combiner 004
Ytterbium gain fibre 005 is mixed in end connection altogether, and the output light mixing ytterbium gain fibre 005 enters prime non-thread by fibre optic isolater 006
Property amplify annular mirror chamber 100, the output in prime non-linear amplification annular mirror chamber 100 again by fibre optic isolater 007 enter after
The non-linear amplification annular mirror chamber 200 of level, it is public that rear class non-linear amplification annular mirror chamber 200 output connects fiber optic splitter 001
End, the relatively low one end of fiber optic splitter 001 splitting ratio is connected by optical fiber filter 003 as the output of laser instrument, the other end
The signal end of pump combiner 004, forms closed loop chamber.Main oscillations chamber provides main gain, and ensures that light runs clockwise, prime
First non-linear amplification annular mirror chamber 100 screens the pulse that amplitude is higher in random fluctuation pulse, then by rear class non-thread
Property amplify annular mirror chamber 200 and narrow pulse, owing to mixing the ytterbium gain fibre 103 preferred 1m of length, mix ytterbium gain fibre 203 length excellent
Selecting 1.5m, semiconductor kistributed-feedback laser 201 power is bigger than semiconductor kistributed-feedback laser 101 power, and reality is compared in rear class non-linear amplification annular mirror chamber 200
Executing example 1 and can amplify pulse, modelocking threshold can reduce further, but before and after eliminating pulse, small-pulse effect ability reduces.Finally, optical fiber divides
The linear polarization mode locking pulse that the output of bundle device 001 splitting ratio relatively low one end is stable.
Embodiment 3
Refering to Fig. 4, the present embodiment is a kind of new laser based on three identical non-linear amplification annular mirror chambeies, its bag
Include identical non-linear amplification annular mirror chamber 100,200,300,000, three, main oscillations chamber；Main oscillations chamber includes fiber optic splitter
001, optical fiber filter 002, semiconductor laser 003, pump combiner 004, mix 005, three Fiber isolation of ytterbium gain fibre
Device 006,007,008.The preferred 8:2 of fiber optic splitter 001 splitting ratio, the preferred 1064nm of optical fiber filter 002 operation wavelength, wavelength
Bandwidth preferably ± 1nm, semiconductor kistributed-feedback laser 003 operation wavelength is preferably 976nm, mixes the ytterbium gain fibre 005 preferred 2m of length.Non-thread
Property amplify annular mirror chamber include semiconductor laser 101,201,301, pump combiner 102,202,302, mix ytterbium gain fibre
103,203,303, high non-linearity phase place optical fiber 104,204,304,2 × 2 beam splitter 105,205,305.Semiconductor kistributed-feedback laser 101,
201,202 operation wavelengths are preferably 976nm, mix ytterbium gain fibre 103,203, the 303 preferred 1m of length, high non-linearity phase place optical fiber
104,204,304 length are consistent, and adjustable length, 2 × 2 beam splitter 105,205, the 305 preferred 60:40 of splitting ratio, splitting ratio is high
One end connects pump combiner 102,202,302.
Semiconductor laser 003 output connects the pumping input of pump combiner 004, the public affairs of pump combiner 004
Ytterbium gain fibre 005 is mixed in end connection altogether, and the output light mixing ytterbium gain fibre 005 enters prime non-thread by fibre optic isolater 006
Property amplify annular mirror chamber 100, the output in prime non-linear amplification annular mirror chamber 100 again by fibre optic isolater 007 enter after
The non-linear amplification annular mirror chamber 200 of level, rear class non-linear amplification annular mirror chamber 200 output is entered by fibre optic isolater 008 again
Entering non-linear amplification annular mirror chamber 300, non-linear amplification annular mirror chamber 300 output connects fiber optic splitter 001 common port, light
Fine relatively low one end of beam splitter 001 splitting ratio is as the output of laser instrument, and the other end connects pumping by optical fiber filter 003 and closes
The signal end of bundle device 004, forms closed loop chamber.Main oscillations chamber provides main gain, and ensures that light runs clockwise, and prime is non-linear
Amplify annular mirror chamber 100 and in random fluctuation pulse, first screen the pulse that amplitude is higher, then by the non-linear amplification of two-stage
Annular mirror chamber 200,300, pulse can narrow further, and multiple annular mirror chambeies can effectively suppress amplitude noise, stable mode-locking, weakens
Pulse is divided, and is more easy to locked mode, reduces modelocking threshold, eliminates small-pulse effect before and after pulse, and narrow pulse.Finally, fiber optic splitter 001
The linear polarization mode locking pulse that the output of splitting ratio relatively low one end is stable.
Claims (7)
1. a pulse full polarization fibre laser based on multiple non-linear amplification annular mirrors, it is characterised in that: it includes main
Vibration chamber (000), prime non-linear amplification annular mirror chamber (100), the one or more non-linear amplification annular mirror chamber of rear class (200,
300 ...)；In laser instrument, light field is propagated clockwise, passes sequentially through described main oscillations chamber (000), prime non-linear amplification annular mirror
Chamber (100), the one or more non-linear amplification annular mirror chamber of rear class (200,300 ...) and main oscillations chamber (000), form closed loop
Chamber；In main oscillations chamber (000), the relatively low one end of beam splitter (001) splitting ratio is as the output of laser instrument；Wherein:
Described main oscillations chamber (000) include fiber optic splitter (001), optical fiber filter (002), semiconductor laser (003),
Pump combiner (004), gain fibre (005), several fibre optic isolater (006,007 ...), semiconductor laser (003) is even
Connecing the pumping input of pump combiner (004), the common port of pump combiner (004) connects gain fibre (005), gain light
The output light of fine (005) enters prime non-linear amplification annular mirror chamber (100), prime non-thread by a fibre optic isolater (006)
Property amplify annular mirror chamber (100) output again by another fibre optic isolater (007) enter rear class one or more non-linear
Amplifying annular mirror chamber (200,300 ...), the one or more non-linear amplification annular mirror chamber of rear class (200,300 ...) output is even
Connecing fiber optic splitter (001) common port, the relatively low one end of fiber optic splitter splitting ratio is as the output of laser instrument, and the other end passes through
Optical fiber filter (002) connects the signal end of pump combiner (004), forms closed loop chamber.
Pulse full polarization fibre laser the most according to claim 1, it is characterised in that: described several fibre optic isolaters
The quantity of (006,007 ...) is equal with the quantity in non-linear amplification annular mirror chamber, and each fibre optic isolater rear end connects non-thread
Property amplify annular mirror chamber.
Pulse full polarization fibre laser the most according to claim 2, it is characterised in that: described non-linear amplification annular
Mirror chamber include the one or more non-linear amplification annular mirror chamber of prime non-linear amplification annular mirror chamber (100), rear class (200,
300 ...)；All non-linear amplification annular mirror cavity configurations are consistent, multi-stage cascade, each non-linear amplification annular mirror interacvity gain
Optical fiber (103,203 ...) and high non-linearity phase place optical fiber (104,204 ...) length is equal or different.
Pulse full polarization fibre laser the most according to claim 3, it is characterised in that: described high non-linearity phase place light
Fine (104,204 ...) are little spot size single-mode fiber or multimode fibre.
Pulse full polarization fibre laser the most according to claim 3, it is characterised in that: described non-linear amplification annular
Mirror chamber connects 2 × 2 beam splitter outputs, and 2 × 2 beam splitter splitting ratios are 60:40,50:50,55:45, or are other beam splitting
Ratio.
Pulse full polarization fibre laser the most according to claim 3, it is characterised in that: described gain fibre (103,
203 ...) the same with gain fibre (005) type in main oscillations chamber, for one or more doping in doped with rare-earth elements
Single-mode fiber, big core diameter multimode fibre, doubly clad optical fiber or photonic crystal fiber.
Pulse full polarization fibre laser the most according to claim 1, it is characterised in that: described main oscillations chamber, non-thread
Property amplify in annular mirror chamber except all devices of high non-linearity phase place optical fiber are all the inclined device of all risk insurance.
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| CN101820129A (en) * | 2010-02-04 | 2010-09-01 | 中国科学技术大学 | Square-wave pulse laser device and square-wave pulse laser generating method |
| CN102904152A (en) * | 2012-11-09 | 2013-01-30 | 天津理工大学 | Eight-shaped cavity type passive mode-locking fibre laser |
| CN103346462A (en) * | 2013-06-24 | 2013-10-09 | 天津理工大学 | Passive mode-locking optical fiber laser based on nonlinear optical fiber magnifying glass |
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