CN107785769A - A kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering - Google Patents
A kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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Abstract
The present invention proposes a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering, utilize the narrow-band spectrum filtering of intracavitary, effectively stabilize spectral component of the pulse in intracavitary evolutionary process, the drift of pulse center wavelength is significantly suppress, so as to largely eliminate the time jitter composition that centre wavelength drift couples through intra-cavity dispersion；Pulse containing a large amount of chirps is after narrow band spectral filter, its time domain width reduces simultaneously with spectral width, so that mean breadth of the pulse in ytterbium single-mode fiber is mixed maintains relatively low state, so as to which by pulse, direct-coupled time jitter composition is limited in relatively low level in time domain.The femto-second laser of the present invention need not optimize the net dispersion amount and mode-lock status of intracavitary repeatedly, low time jitter operating can be realized under the conditions of different net dispersions, it is simple in construction, it is easy to operate, repeatability and long-time stability are good, can obtain practical low time jitter ultrashort pulse sequence.
Description
Technical field
The invention belongs to technical field of ultrafast laser, is related to a kind of low time jitter optical fiber femtosecond laser.
Background technology
Femtosecond (fs, 10-15S) the ultrashort pulse sequence of laser output has that pulse width is narrow, peak power is high, light beam
The features such as quality is good, just obtained a wide range of applications in numerous areas from its birth.In recent years, laser noise is theoretical
Development and the progress low time jitter characteristics that cause femtosecond laser exclusive of measurement means gradually highlight, and then promoted its to make
For signal source high-precision range measurement, pump probe experiment, clock signal issue etc. Disciplinary Frontiers application.Femto-second laser
Amplified spontaneous emission noise of the time jitter substantially in the gain media, this noise contribution can be simultaneously in spectrum
Domain and time domain influence the distribution of pulse, cause the time jitter of pulse.In order to obtain the ultrashort pulse sequence of low time jitter, fly
The optimization of second laser chamber internal dynamics process is always the emphasis of research.Solid state laser using doped crystal as gain media
There is obvious advantage always in this aspect, wherein most typical example is exactly titanium-doped sapphire laser, by its superelevation
Intracavitary pulse energy and ultra-narrow intracavitary pulse width, be always maintained at the record of low time jitter.But solid state laser
It is generally basede on discrete component to build, the required precision to the coupling of intracavitary light field space is high；In addition, the radiating of block gain media compared with
Slowly, the further raising for accumulating mean power in meeting restricted room of heat.Therefore, solid state laser to the temperature of working environment,
The requirement of the indexs such as humidity, mechanical oscillation is very harsh, causes its operation and maintenance cost high, difficulty is big, can not really realize
It is practical.
Compared to solid state laser, the optical field distribution of optical fiber femtosecond laser is mainly limited to inside fibre core, to space
Coupling accuracy requires low, insensitive to extraneous environmental change；The long and narrow waveguiding structure of optical fiber can be accelerated to hand over the heat in the external world
Change, effectively slow down the thermal accumlation of inside of optical fibre；In addition, optical fiber laser output beam quality is high, compact-sized, price is low
It is honest and clean, it is easily operated, it is easier to adapt to the application environment of complexity.Unlike solid state laser, the ripple of optical fiber laser intracavitary
Guide structure can introduce bigger dispersion measure and more abundant nonlinear effect, and this causes pulse evolution mode in resonator more
Sample is added, therefore the optimization of time jitter is also increasingly complex.When intracavitary net dispersion amount is larger, dynamics mistake of the pulse in intracavitary
Journey is often relatively simple, and operating is relatively stable.But substantial amounts of intra-cavity dispersion can drift about centre wavelength of the pulse in spectral domain
Significantly it is coupled in the time domain distribution of pulse, aggravates time jitter；Meanwhile substantial amounts of intra-cavity dispersion will also result in pulse and increase
Mean breadth in beneficial optical fiber is wider so that amplified spontaneous emission noise is easier to influence the time-domain position of pulse, can equally add
Acute time jitter.Therefore, the optimum ideals of presently most used optical fiber laser time jitter mainly include eliminating dispersive influence
In terms of intracavitary typical pulse width two is reduced：First, dispersion management in transit chamber, approach net dispersion amount in laser chamber
Zero, so as to suppress by the centre wavelength drift coupled of pulse and Lai time jitter composition；In addition, pass through its in adjusting cavity
Its parameters, makes laser works breathe orphan's mode-lock status, mean breadth of the pulse in intracavitary is reduced as far as possible, so as to press down
Make the horizontal rising of its time jitter.Up to the present, above-mentioned optimization method achieves notable achievement, optical fiber in an experiment
The time jitter level of femto-second laser has been lowered to and femto-second solid laser device identical magnitude.It is but net for being operated in
The optical fiber femtosecond laser of zero dispersion, its mode-lock status are frequently not unique, the horizontal meeting of time jitter between different conditions
There is bigger difference.Therefore, the appearance of low time jitter state generally requires to optimize the dispersion measure of intracavitary and locked mode shape repeatedly
State, regulation difficulty are big.In addition, the evolutionary process of pulse is easily influenceed by perturbation outside intracavitary, cause the work shape of laser
State irregular saltus step between different mode-lock status, or even there is multiple-pulse operating, significantly reduce the repeatability of system
And long-time stability, so as to counteract the practical advantage of optical fiber laser.
Therefore, the high low time jitter lock of simple regulation, favorable repeatability, long-time stability is realized in optical fiber laser
Mould operates, and is one of key technology for breaking through the practical bottleneck of low noise optical fiber femtosecond laser, for optical fiber femtosecond laser
Practical development it is significant.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art, the present invention propose that one kind is based on narrow band light
The low time jitter optical fiber femtosecond laser of spectral filter, the femto-second laser need not optimize the net dispersion amount and lock of intracavitary repeatedly
Mould state, low time jitter operating, simple in construction, easy to operate, repeatability can be realized under the conditions of different net dispersions
It is good with long-time stability, practical low time jitter ultrashort pulse sequence can be obtained.
The technical solution adopted in the present invention is：A kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering
Device, including：Fibre coupled laser diode, wavelength-division multiplex optical fiber coupler, mix ytterbium single-mode fiber, the first optical fiber collimator,
One quarter-wave plate, the first half wave plate, space optoisolator, narrow band spectral filter, the second half wave plate,
Speculum, the first grating, the second grating, mirror of climbing, the second quarter-wave plate and the second optical fiber collimator；
Fibre coupled laser diode exports pumping laser, and fiber-optic output and the wavelength-division of fibre coupled laser diode are answered
With the pumping laser input welding of fiber coupler, the signal output part of wavelength-division multiplex optical fiber coupler is with mixing ytterbium single-mode fiber
Pumping laser input is mixed ytterbium single-mode fiber, makes to mix mixing in ytterbium single-mode fiber by input welding, wavelength-division multiplex optical fiber coupler
Heteroion transits to excitation state, forms population inversion, amplifies the laser pulse of input；
The single-mode tail fiber welding of ytterbium single-mode fiber output end and the first optical fiber collimator is mixed, mixes what is transmitted in ytterbium single-mode fiber
Positive chirped laser pulse is with elliptical polarization by the first optical fiber collimator coupling output to the space segment of laserresonator, space
In positive chirped laser pulse pass through the first quarter-wave plate and the first half wave plate successively；
First quarter-wave plate and the first half wave plate by the polarization state of the positive chirped laser pulse in space by
Elliptical polarization is adjusted to linear polarization, inputs to space optoisolator；
The positive chirped pulse of linear polarization is divided into polarization state and is mutually perpendicular to by the polarization beam apparatus of space optoisolator input
Two beams, a branch of to reflect laserresonator through polarization beam apparatus, as output light, another beam enters empty through polarization beam apparatus
Between optoisolator, space optoisolator output to narrow-band spectrum will be filtered after linear polarization positive chirped pulse rotation set angle
Device；
Narrow band spectral filter filters out spectral component unnecessary in the positive chirped pulse of linear polarization of input, cuts down linear inclined
Shaken the time domain width of positive chirped pulse, and the positive chirped pulse of linear polarization is exported to the second half wave plate；
The polarization state of the narrow spectrographic pulse of the positive chirp of linear polarization is adjusted to horizontal by the second half wave plate, horizontal linearity
Polarized pulses are successively after the first grating and the second optical grating reflection, then through mirror hoisting depth of climbing, then successively through the second grating
With the first optical grating reflection to speculum, the positive chirp of the first grating and the second linear polarized pulses of grating compensation level；
Speculum reflects the linear polarization pulse through chirp compensation to the second quarter-wave plate, the second quarter-wave plate
Exported after the polarization state of linear polarization pulse is adjusted into elliptical polarization to the second optical fiber collimator；
The output end of second optical fiber collimator and the signal input part welding of wavelength-division multiplex optical fiber coupler, by elliptical polarization
Laser pulse through chirp compensation inputs to mixing ytterbium single-mode fiber again through wavelength-division multiplex optical fiber coupler.
The dispersion for mixing ytterbium single-mode fiber is on the occasion of the process that pumping laser pulse is transmitted in ytterbium single-mode fiber is mixed
In, pulse energy, pulse temporal width, spectral width are exponentially increased with the increase of transmission range, while are accumulated linear
Positive chirp.
The length for mixing ytterbium single-mode fiber is 0.25m~0.4m.
The wavelength-division multiplex optical fiber coupler, the first optical fiber collimator, the tail optical fiber total length of the second optical fiber collimator are 0.5
~0.8m, fiber type are identical.
The narrow band spectral filter is transmission-type narrow band spectral filter, centre wavelength 1040nm, the big overall with of half-shadow
Spend for 6nm~10nm.
First quarter-wave plate, the first half wave plate, space optoisolator, the second half wave plate,
Speculum, the first grating, the second grating, the centre wavelength of climb mirror and the second quarter-wave plate are 1040nm.
First quarter-wave plate, the first half wave plate, space optoisolator, the second half wave plate,
Speculum, the first grating, the second grating, service band covering 1000nm~1100nm of climb mirror and the second quarter-wave plate
Scope.
The speculum is 45° angle speculum.The mirror of climbing includes two 45° angle speculums, two 45° angle speculums
Reflecting surface be in 90 °.
The space optoisolator ensures that the laser that output end is only transferred to from its input can be by, spatial light every
Input polarization beam splitter from device is output coupling port.
The present invention compared with prior art the advantages of be：
(1) the low time jitter optical fiber femtosecond laser provided by the invention based on narrow-band spectrum filtering, utilizes intracavitary
Narrow-band spectrum filtering, spectral component of the pulse in intracavitary evolutionary process is effectively stabilized, significantly suppress in pulse
Cardiac wave length drift, so as to largely eliminate centre wavelength drift through intra-cavity dispersion coupling time jitter into
Point.On the other hand, after narrow band spectral filter, its time domain width drops the pulse containing a large amount of chirps simultaneously with spectral width
It is low so that mean breadth of the pulse in ytterbium single-mode fiber is mixed maintains relatively low state, so as to by pulse in time domain directly
The time jitter composition of coupling is limited in relatively low level.Different from traditional big dispersive optical fiber femto-second laser, the present invention can
To significantly reduce the time jitter of output pulse sequence level.
(2) the low time jitter optical fiber femtosecond laser provided by the invention based on narrow-band spectrum filtering, using positioned at chamber
Narrow-band spectrum filtering before interior dispersion compensation, the pulse spectrum width of experience dispersion compensation is significantly reduced, so as to weaken
Influence of the chromatic dispersion compensation quantity to developing in impulse chamber.On the other hand, the narrow-band spectrum filtering of intracavitary triggers pulse in positive dispersion
Amplification self similarity in gain fibre develops, so as to introduce non-linear suction effect so that pulse drilling in gain fibre
Change process is relatively fixed.Therefore, the change of intracavitary net dispersion amount influences minimum on the intracavitary dynamic process of pulse, and this causes
State the operating of low time jitter is not influenceed by intracavitary net dispersion amount substantially.Breathed compared to laser works are made in net zero dispersion
The method of orphan's mode-lock status, the present invention can omit the intracavitary net dispersion optimization process of complexity, greatly streamline operation,
The unicity of mode-lock status is kept simultaneously, is obviously improved the repeatability and long-time stability of laser, is more beneficial for the low time
Shake the practical of optical fiber femtosecond laser.
Brief description of the drawings
Fig. 1 is the apparatus structure signal of low time jitter optical fiber femtosecond laser of the present invention based on narrow-band spectrum filtering
Figure；
Fig. 2 (a), Fig. 2 (b), Fig. 2 (c) be respectively test measurement laser of the present invention intracavitary be net negative dispersion (16),
Output spectrum intensity curve when net zero dispersion (17), net positive dispersion (18)；
Fig. 3 (a), Fig. 3 (b) are respectively the laser of the present invention for testing measurement in net positive dispersion (19,20) and net negative dispersion
Under the conditions of (21,22), output pulse sequence when without narrow-band spectrum filtering (19,21) and filtering (20,22) comprising narrow-band spectrum
Time jitter power spectral density plot；
Fig. 4 is time jitter level curve of the laser of the present invention of numerical simulation in different cavity under the conditions of net dispersion.
Embodiment
The embodiment of the present invention is further described in detail below in conjunction with the accompanying drawings.
Femto-second laser of the present invention filters the reply for significantly enhancing gain fibre finite bandwidth and bringing using narrow-band spectrum
Stress effect, further suppress pulse in gain fibre in amplification process by amplified spontaneous emission noise influenceed and it is caused in
The long random drift of cardiac wave, and then fundamentally significantly weaken and caused by the unstability of pulse spectrum composition and by intracavitary
The time jitter component in pulse is coupled in dispersion.On the other hand, the spectral component away from centre wavelength is past in high-chip pulse
Toward two edges for being located at pulse, when by narrow band spectral filter, two edges of pulse can be weakened, and its time domain width is significantly dropped
It is low.This causes pulse to keep relatively small time domain width in amplification process in gain fibre, and then is effectively reduced
Amplified spontaneous emission noise is in the directly caused time jitter component of time domain in gain fibre.At the same time, intracavitary narrow-band spectrum
Filtering can be developed with amplification self similarity of the trigger pulse in positive dispersion gain fibre, the now non-linear attraction in gain fibre
Effect can cause evolutionary process of the pulse in gain fibre to be relatively fixed, and then make the intracavitary dynamics under different net dispersion amounts
Process reaches unanimity, and this allows for the time jitter operating condition of femto-second laser of the present invention hardly by intracavitary net dispersion amount
Influence.Different from prior art, laser of the present invention can obtain the ultrashort arteries and veins of low time jitter under different net dispersion amounts
Sequence is rushed, without net dispersion amount in adjusting cavity repeatedly；Due to narrow-band spectrum filtering trigger it is non-thread in gain fibre
Property sucking action so that impulse chamber internal dynamics process is relatively single, the mode-lock status without optimizing laser repeatedly,
While operation is significantly simplified, the repeatability and long-time stability of laser are significantly improved, is more beneficial for promoting in fact
With the research and development for changing low time jitter optical fiber femtosecond laser.
The present invention based on narrow-band spectrum filtering low time jitter optical fiber femtosecond laser apparatus structure as shown in figure 1,
Using the ring cavity structure of nonlinear polarization rotation locked mode.Including fibre coupled laser diode 1, wavelength-division multiplex optical fiber coupler
2nd, mix ytterbium single-mode fiber 3, the first optical fiber collimator 4, the first quarter-wave plate 5, the first half wave plate 6, spatial light every
From device 7, narrow band spectral filter 8, the second half wave plate 9, speculum 10, the first grating 11, the second grating 12, mirror of climbing
13rd, the second quarter-wave plate 14 and the second optical fiber collimator 15.Speculum 10 is 45° angle speculum.Narrow band spectral filter 8
For transmission-type narrow band spectral filter.
The output wavelength of fibre coupled laser diode 1 be 976nm continuous laser be used as pump light, its fiber-optic output and
The pumping end welding of wavelength-division multiplex optical fiber coupler 2.The signal output part of wavelength-division multiplex optical fiber coupler 2 is with mixing ytterbium single-mode fiber
3 input welding, pump light couple input through wave division multiplex coupler 2 and mix ytterbium single-mode fiber 3, make to mix in ytterbium single-mode fiber 3
Ytterbium ion transit to excitation state, form high level population inversion, and then amplify the laser pulse of input.Narrow spectrum, narrow arteries and veins
The laser pulse for rushing width mixes ytterbium single-mode fiber 3 by the signal output part entrance of wavelength-division multiplex optical fiber coupler 2, is mixing ytterbium single mode
In optical fiber 3 under the collective effect of positive dispersion, nonlinear effect and gain, the time domain width of pulse, spectral width, pulse energy
Increased with its transmission in ytterbium single-mode fiber 3 is mixed with exponential law；Mixing the output end of ytterbium single-mode fiber 3, pulse
The substantial amounts of linear positive chirp of accumulation.The output end of Yb dosed optical fiber 3 and the single-mode tail fiber welding of the input of the first optical fiber collimator 4,
In above-mentioned single-mode tail fiber under the collective effect of positive dispersion and nonlinear effect, its time domain and spectral width continue broadening for pulse,
And then it is coupled to elliptical polarization the space segment of laserresonator in the output end of the first optical fiber collimator 4.It is oval
The positive chirped pulse of polarization state is conditioned by the first quarter-wave plate 5 and the first half wave plate 6, its polarization state successively
For linear polarization；First quarter-wave plate 5 and the first half wave plate 6 are placed on rotatable transmission mirror holder, transmission
The polarization direction of linearly polarized photon is determined by the fast shaft position of above-mentioned wave plate.Above-mentioned linearly polarized photon incides space optoisolator
The polarization beam apparatus of 7 incidence ends, and be divided into the orthogonal two beams linearly polarized photon of polarization state, two beam linearly polarized photons it is strong
Degree ratio is determined by the polarization direction of incident pulse；Wherein a branch of polarization beam apparatus by the incidence end of polarization beam apparatus 7 reflects
Laserresonator, form the output light of the laser, its exemplary spectrum such as Fig. 2 (a) arrive curve 16 in Fig. 2 (c), curve 17,
Shown in curve 18；Another beam keeps one direction transmission through polarization beam apparatus 7 and with linear polarization state.Above-mentioned intracavitary transmission line
Polarized pulses pass through narrow band spectral filter 8, and its spectral component away from centre wavelength is filtered out by narrow band spectral filter 8；On
Two edges that the spectral component being filtered out is predominantly located at pulse are stated, causes the time domain width of pulse while is cut in, acquisition narrow bandwidth,
Narrow spaces pulse.Above-mentioned narrow bandwidth, narrow spaces pulse pass through the second half wave plate 9, and its polarization state is adjusted to horizontal line
Property polarization.Above-mentioned pulse subsequently enters the intra-cavity dispersion being made up of the first grating 11, the second grating 12, mirror 13 of climbing and compensates system
System, after being reflected successively by the first grating 11 and the second grating 12 in the system, climbing, the internal reflection of mirror 13 lifts light twice
Shu Gaodu, then reflected successively by the second grating 12 and the first grating 11, Dispersion Compensation Systems are finally reflected by speculum 10；Color
Dissipate the negative chirp value that compensation system provides and determine that distance is got between grating by the distance between the first grating 11 and the second grating 12
Greatly, it is bigger to bear chirp value.The above-mentioned linear polarization pulse by chirp compensation passes through the second quarter-wave plate 14, its polarization state
It is adjusted to elliptical polarization.It is humorous that the elliptical polarization narrow bandwidth, narrow spaces pulse through the second optical fiber collimator 15 are coupled into laser
Shake the fiber section of chamber.The single-mode tail fiber output end of second optical fiber collimator 15 and the signal of wavelength-division multiplex optical fiber coupler 2 are defeated
Enter and hold welding, above-mentioned pulse positive dispersion and non-thread in the tail optical fiber of the second optical fiber collimator 15 and wavelength-division multiplex optical fiber coupler 2
Property effect collective effect under, its time domain and the gradual broadening of spectral width are then again introduced into and mixed in ytterbium single-mode fiber 3, formed
One complete intracavitary kinetic loop.
The femto-second laser of the present invention is the annular cavity laser of nonlinear polarization rotation locked mode.The output of femto-second laser
Coupling efficiency is determined by fast, the slow axis position of the first quarter-wave plate 5 and the first half wave plate 6.Space optoisolator 7 wraps
Input polarization beam apparatus, Faraday polarization apparatus, output end polarization beam apparatus are included, the incident light of linear polarization polarizes in input
It is divided into orthogonal two beam of polarization state in beam splitter, it is a branch of to be used as Laser Output Beam to be reflected laserresonator,
Another beam is transferred into Faraday polarization apparatus along former direction, and the polarization state of the latter rotates set angle in Faraday polarization apparatus
(generally 45 °), then completely through output end polarization beam apparatus, into subsequent optical path, it is only defeated from its that it act as guarantee
Enter end be transferred to the laser of output end can be by, and input polarization beam splitter is as the laser output coupling port.It is narrow
Band spectrum wave filter 8 is located at after the output end of space optoisolator 7, and before grating.Positive chirped pulse is through grating four times
The chromatic dispersion compensation quantity that chirp value after reflection is provided by grating determines, the chromatic dispersion compensation quantity that grating provides is by the first grating 11 and the
The incisure density of the distance between two gratings 12 and the first grating 11 and the second grating 12 determines.Mirror 13 climb by two reflectings surface
In 90 ° of 45° angle speculum groups into.
The length that ytterbium single-mode fiber 3 is mixed in femto-second laser of the present invention is 0.25m~0.4m, wavelength-division multiplex optical fiber coupler
2nd, the first optical fiber collimator 4, the tail optical fiber total length of the second optical fiber collimator 15 are 0.5~0.8m, and fiber type is identical.Narrow band light
The centre wavelength of spectral filter 8 is 1040nm, and full width half maximum is 6nm~10nm.First quarter-wave plate the 5, the 1st
/ mono- wave plate 6, space optoisolator 7, the second half wave plate 9, speculum 10, the first grating 11, the second grating 12, climb
The centre wavelength of the high quarter-wave plate 14 of mirror 13 and second is 1040nm, its service band covering 1000nm~1100nm models
Enclose.
The spectrum of femto-second laser output pulse sequence of the present invention is measured using spectrometer, when intracavitary is negative color only
When scattered, net zero dispersion and net positive dispersion, the output spectrum such as Fig. 2 (a) of laser arrive curve 16, curve 17, curve in Fig. 2 (c)
Shown in 18, its full width half maximum is 15nm~25nm, and is not changed substantially with the increase and decrease of intracavitary net dispersion amount.The present invention swashs
The time jitter of light device output pulse sequence is horizontal to be measured using balance optical cross-correlation system, when intracavitary is net positive dispersion
When, for the time jitter power spectral density plot of laser of the present invention as shown in curve 20 in Fig. 3 (a), its level compares the same terms
Laser not comprising narrow band spectral filter 8 low 10dB~15dB (as shown in curve 19 in Fig. 3 (a)) down；When intracavitary is net
During negative dispersion, the time jitter power spectral density of laser of the present invention is as shown in curve 22 in Fig. 3 (b), and its level is than identical bar
Laser not comprising narrow band spectral filter 8 low 5dB~10dB (as shown in curve 21 in Fig. 3 (b)) under part.Femtosecond of the present invention
The time jitter level of laser is in intracavitary net dispersion amount from -0.03ps2Change to+0.02ps2During time jitter it is horizontal
As shown in curve 23 in Fig. 4, its variable quantity is less than 1dB, is hardly influenceed by the change of intracavitary net dispersion amount.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art, and described above is only the excellent of the present invention
Select embodiment, it is noted that without departing from the technical principles of the invention, some improvement and replacement can also be made,
These, which improve and replaced, should also be considered as protection scope of the present invention.
Claims (10)
- A kind of 1. low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering, it is characterised in that including：Fiber coupling Laser diode (1), wavelength-division multiplex optical fiber coupler (2), mix ytterbium single-mode fiber (3), the first optical fiber collimator (4), the one or four / mono- wave plate (5), the first half wave plate (6), space optoisolator (7), narrow band spectral filter (8), the two or two point One of wave plate (9), speculum (10), the first grating (11), the second grating (12), mirror of climbing (13), the second quarter-wave plate And the second optical fiber collimator (15) (14)；Fibre coupled laser diode (1) exports pumping laser, the fiber-optic output of fibre coupled laser diode (1) and wavelength-division The pumping laser input welding of multiplexing fiber-optic coupler (2), the signal output part of wavelength-division multiplex optical fiber coupler (2) is with mixing ytterbium Pumping laser input is mixed ytterbium single-mode fiber (3), makes to mix by single-mode fiber (3) input welding, wavelength-division multiplex optical fiber coupler (2) Doped ions in ytterbium single-mode fiber (3) transit to excitation state, form population inversion, amplify the laser pulse of input；The single-mode tail fiber welding of ytterbium single-mode fiber (3) output end and the first optical fiber collimator (4) is mixed, is mixed in ytterbium single-mode fiber (3) The positive chirped laser pulse of transmission is with elliptical polarization by the first optical fiber collimator (4) coupling output to the space of laserresonator Part, the positive chirped laser pulse in space pass through the first quarter-wave plate (5) and the first half wave plate (6) successively；First quarter-wave plate (5) and the first half wave plate (6) are by the polarization state of the positive chirped laser pulse in space Linear polarization is adjusted to by elliptical polarization, inputted to space optoisolator (7)；It is orthogonal that the positive chirped pulse of linear polarization is divided into polarization state by the polarization beam apparatus of space optoisolator (7) input Two beams, a branch of to reflect laserresonator through polarization beam apparatus, as output light, another beam enters space through polarization beam apparatus Optoisolator (7), space optoisolator (7) filter output to narrow-band spectrum after the positive chirped pulse rotation set angle of linear polarization Ripple device (8)；Narrow band spectral filter (8) filters out spectral component unnecessary in the positive chirped pulse of linear polarization of input, cuts down linear inclined Shaken the time domain width of positive chirped pulse, and the positive chirped pulse of linear polarization is exported to the second half wave plate (9)；The polarization state of the narrow spectrographic pulse of the positive chirp of linear polarization is adjusted to horizontal by the second half wave plate (9), horizontal linearity Polarized pulses are successively after the first grating (11) and the second grating (12) reflection, then through mirror of climbing (13) hoisting depth, Ran Houyi It is secondary to reflex to speculum (10), the first grating (11) and the second grating (12) compensation through the second grating (12) and the first grating (11) The positive chirp of horizontal linear polarisation pulse；Speculum (10) reflects the linear polarization pulse through chirp compensation to the second quarter-wave plate (14), the second a quarter Wave plate (14) is exported to the second optical fiber collimator (15) after the polarization state of linear polarization pulse is adjusted into elliptical polarization；The output end of second optical fiber collimator (15) and the signal input part welding of wavelength-division multiplex optical fiber coupler (2), by ellipse Laser pulse of the polarization through chirp compensation inputs to mixing ytterbium single-mode fiber (3) again through wavelength-division multiplex optical fiber coupler (2).
- 2. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 1, it is special Sign is that the dispersion for mixing ytterbium single-mode fiber (3) is on the occasion of pumping laser pulse transmission in ytterbium single-mode fiber (3) is mixed During, pulse energy, pulse temporal width, spectral width are exponentially increased with the increase of transmission range, are accumulated simultaneously Linear positive chirp.
- 3. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 1 or 2, its It is characterised by, the length for mixing ytterbium single-mode fiber (3) is 0.25m~0.4m.
- 4. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 3, it is special Sign is that the wavelength-division multiplex optical fiber coupler (2), the first optical fiber collimator (4), the tail optical fiber of the second optical fiber collimator (15) are total Length is 0.5~0.8m, and fiber type is identical.
- 5. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 4, it is special Sign is, the narrow band spectral filter (8) is transmission-type narrow band spectral filter, centre wavelength 1040nm, and half-shadow is complete works of Width is 6nm~10nm.
- 6. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 4 or 5, its Be characterised by, first quarter-wave plate (5), the first half wave plate (6), space optoisolator (7), the two or two point One of wave plate (9), speculum (10), the first grating (11), the second grating (12), mirror of climbing (13) and the second quarter-wave plate (14) centre wavelength is 1040nm.
- 7. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 6, it is special Sign is, first quarter-wave plate (5), the first half wave plate (6), space optoisolator (7), the two or two/ One wave plate (9), speculum (10), the first grating (11), the second grating (12), mirror of climbing (13) and the second quarter-wave plate (14) service band covering 1000nm~1100nm scopes.
- 8. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 1 or 2, its It is characterised by, the speculum (10) is 45° angle speculum.
- 9. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 1 or 2, its It is characterised by, the mirror of climbing (13) includes two 45° angle speculums, and the reflecting surface of two 45° angle speculums is in 90 °.
- 10. a kind of low time jitter optical fiber femtosecond laser based on narrow-band spectrum filtering according to claim 1 or 2, Characterized in that, the space optoisolator (7) ensures that the laser that output end is only transferred to from its input can be by empty Between the input polarization beam splitter of optoisolator (7) be output coupling port.
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| CN109842010A (en) * | 2019-01-23 | 2019-06-04 | 中山铟尼镭斯科技有限公司 | A kind of laser pulse width compressor |
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