CN107069403A - Based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser - Google Patents
Based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser Download PDFInfo
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- CN107069403A CN107069403A CN201710429274.6A CN201710429274A CN107069403A CN 107069403 A CN107069403 A CN 107069403A CN 201710429274 A CN201710429274 A CN 201710429274A CN 107069403 A CN107069403 A CN 107069403A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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Abstract
The invention discloses it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser, belong to optical fiber laser field, solve the passive mode-locking fiber laser of tunable wave length in the prior art, it is that independent wavelength tuning device insertion intracavitary is realized into wavelength tuning, it is complicated, and intracavitary light energy loss it is larger the problem of.The present invention includes laser pumping source, the bundling device being connected with laser pumping source, the output coupling mirror being connected with bundling device, the condenser lens and wave filter being connected with output coupling mirror, the line style resonator being connected with condenser lens；The line style resonator includes the gain fibre being connected with condenser lens, first be connected with gain fibre draws cone fluoride fiber, the second drawing cone fluoride fiber that cone fluoride fiber is connected is drawn with first, the collimation focusing system that cone fluoride fiber is connected, the SESAM being connected with collimation focusing system are drawn with second.The present invention is used to realize wavelength tuning.
Description
Technical field
It is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser, for realize wavelength adjust
It is humorous, belong to optical fiber laser field.
Background technology
The pulse width of common solid pulse optical fiber output is usually hundreds of microseconds even millisecond magnitude, peak value
Power is general in tens kilowatts of magnitudes, and such parameter index can not be applied to modern fast-developing science and technology, for example：Swash
Light precise distance measurement, high-speed photography, laser radar, high-resolution spectro scopy research.This for short-pulse light source wilderness demand
Background under, scientific research personnel have developed laser Q-switching technology and mode-locking technique.Nineteen sixty invents First laser in the world.
Followed by, 1961 yearly correlation researchers propose the concept for adjusting Q, it is, all radiation energies are focused on extremely narrow
Launch in pulse.1962, scientist invented global First Q-switched laser, realizes 10-7S pulsewidths, 600kW its peak works
Rate pulse train is exported.Afterwards several years, Q-regulating technique was quickly grown, and several Q-regulating techniques are reported successively：It is electric-optically Q-switched, can protect
Q and acousto-optic Q modulation etc. are adjusted with absorber so that pulse width is linearly improved by huge compression, the output of laser.
The appearance of Q-regulating technique, is that the development of laser is made that important contribution, has greatly promoted many scientific application skills
The development of art.However, Q-regulating technique by itself generation mechanism because limited, its pulse width that can be produced is difficult to enter one again
Step compression.So in 1964, scientific research personnel invented mode locking technology again, this is a kind of compressed pulse widths, improves peak
It is worth the new mechanism of power, it can export the pulse width of picosecond magnitude, therefore referred to as Ultrashort pulse technology.We have been now
Through knowing, compared to Q-regulating technique, the advantage of locked mode is：It can produce the pulsewidth with femtosecond magnitude, terawatt (TW) above its peak work
The pulse laser sequence of rate.This breakthrough major progress causes physics, biology, chemistry and the scientific research personnel of spectroscopy
The microcosmos for itself science and the research field of ultrafast process can be set foot in.The appearance of ultrashort pulse is also expedited the emergence of out perhaps
More brand-new subject and novel application places.Because mode-locking technique enables to laser energy highly to collect on space and time domain
In, so compared with common laser, the monochromatic brightness of Mode-locked laser is greatly improved than continuous light；Meanwhile, in terms of brightness,
Mode-locked laser has unprecedented leap, so that this brand-new high brightness Mode-locked laser and matter interaction
When, former unknown new phenomenon and new technology, such as nonlinear optical effect are generated, while also generating many nonlinear opticals
Technology.
The mode-locking technique of optical fiber laser is the important, technology of purposes widely, it can produce it is high-quality,
Light pulse relevant and with transform limit pulsewidth.In a mode-locked laser, adjusted by the periodicity to gain media
System, realizes that pulsewidth is typically smaller than the pulse train output of the phase coherence of 1 psec.Whole frequency contents of pulse are formed, also
It is all mode to form pulse, by PGC demodulation, therefore the time-bandwidth product of pulse meets the Fourier transformation limit.For
Given pulse shape, transform limit pulsewidth has minimum time-bandwidth product.Change change poles produced by mode locked fiber laser
Light pulse is limited, with higher repetition rate, while the centre wavelength of pulse can be tuned in very wide spectral region；
Therefore, it is possible to the dense wave division multipurpose field applied to optic communication.Also, mode locked fiber laser can be used for optical signal prosessing
With wavelength conversion field, it also can be used as high-speed light toggle lights.
The mode locking pulse light source that centre wavelength is capable of continuous tuning can apply to high speed wavelength division multiplexing/Optical Time Division Multiplexing
(DWDM/OTDM) various fields such as communication system, Fibre Optical Sensor, optical coherence tomography light source and metrology and measurement.In recent years, ripple
Long tunable passive mode-locking fiber laser is because with output beam quality height, perfect heat-dissipating, high conversion efficiency, structure
The advantage such as compact, highly reliable, and as study hotspot.
At present, various countries researcher mainly uses Linear-Cavity, and 8 word chambers and annular chamber build the passive mode-locking light of tunable wave length
Fibre laser.2004, Hideyuki Sotobayashi of Massachusetts Institute Technology et al. built Linear-Cavity SESAM locked modes
Erbium doped fiber laser, realizes that mode locking pulse wavelength is tuned in 1570~1600nm, tuning range 30nm using F-P wave filters.
2006, Jilin University Zhou Hongjie et al. reports utilized F-P adjustable light wave-filters, and gain fibre, list are used as in Er-doped fiber
Wall carbon nano tube as realized in the ring-like chamber passive mode-locking fiber laser of saturable absorber centre wavelength 1520~
1560nm tuning.2008, SamuliKivisto of Tampere, Finland Polytechnics et al. mixed in SESAM locked mode Linear-Cavities
1025~1055nm wavelength tuning, but required Direct Digital are realized in ytterbium optical fiber laser using acousto-optic tunable filter
Formula frequency synthesizer is complex, and wavelength tuning is discrete and discrete., Chinese Academy of Sciences's Xi'an optical precision in 2009
Mechanical investigations Lee's Zhe et al. make pulse using tunable fiber grating filter in 8 word chamber locked mode ytterbium-doping optical fiber lasers
Centre wavelength is tuned in 1047~1055nm, tuning range 8nm, and average output power 8.02mW.2010, Hebei was pedagogical big
S.M.Zhang et al. of department of physics is learned in nonlinear polarization rotation locked mode erbium-doped fiber ring laser, using non-equilibrium
Mach-Zehnder interferometer realizes wavelength tuning, tuning range 30nm.2012, someone's report utilized Volume Bragg grating (VBG)
As hysteroscope and wavelength tuning device, gain fibre is being used as using SESAM as saturable absorber, using polarization-maintaining Yb dosed optical fiber
Centre wavelength is realized in Linear-Cavity mode-locked laser in 1011.9~1050.6nm continuous tunings, tuning range reaches 38.7nm.
Above-mentioned experiment is that independent wavelength tuning device insertion intracavitary is realized into wavelength tuning, complicated, and intracavitary light energy
Loss is larger.
Prior art one：As shown in Figure 1 and Figure 2, a kind of tunable Linear-Cavity ytterbium-doping optical fiber laser structure, its feature
It is：Including semiconductor laser pumping source 1, isolator 2,976/1035 wavelength division multiplexer (WDM) 3, polarization-maintaining Yb dosed optical fiber 4,
10% output coupler 5, collimater 6, condenser lens 7, saturable absorber SESAM 8, Volume Bragg grating (VBG) 9,3dB
Coupler 10, spectrometer 11 and oscilloscope-detector 12.Whole devices in the laser, in addition to SESAM, remaining device
Center operating wavelength is 1035nm.Wherein, SESAM center operating wavelength is about 1060nm, and reflectivity is about 95%, is used for
Passive mode-locking.Laser is focused to small size hot spot on SESAM surface using short focus lens, be so conducive to improving hot spot energy
Metric density is to realize the startup of passive mode-locking.4 be polarization-maintaining high concentration Yb dosed optical fiber, as gain media in experiment, length
For 80cm.VBG line density is 600l/mm, and it has high reflectance, and reflection bandwidth is less than 0.5nm, in an experiment for locked mode
The continuous tuning device of pulse center wavelength, also serves as hysteroscope.Pumping source is 980nm semiconductor lasers, peak power output
500mW.The output coupling ratio of output coupler is 10%, and the 1 mu m waveband laser pulse exported from this 10% port is passed through again
Three-dB coupler is divided into two-way：Spectrometer is wherein connect all the way；Oscillograph is accessed on another road.976/1035nmWDM nominal work
Make bandwidth 10nm, cover 1030~1040nm.Isolator prevents Laser feedback from damaging laser diode to pumping source.This programme
Middle utilization VBG spectral and the characteristic of wavelength is selected to realize the continuous tuning of mode locking pulse centre wavelength.As shown in Fig. 2 with anti-
Penetrate the wavelength tuning principle of the formula balzed grating, model analysis laser.In this programme, to make diffraction primary maximum while being the 1st grade
Interfere main pole general orientation, it is necessary to meet (1) formula, select positive first-order spectrum of the light of the outgoing from collimater after VBG diffraction to return
Return to intracavitary vibration, then VBG diffraction wavelength λ is determined by following formula：
2dsinθ0Cos α=λ (1)
Wherein, d is grating constant, θ0For zigzag groove face and the angle of grating planar, for given grating, d and θ0For
Fixed value；α is the angle of incident light direction and cutting face normal；For incident light direction and the angle of grating face normal.Experiment
In, make the less parallel light that collimater is exported incident with α angles one minimum first, reflected light (i.e. positive first-order spectrum) has micro-
The small angle of divergence, wherein a certain wavelength X0Just collimater can be returned, concussion is formed, then output wavelength is λ by laser0
Laser.When regulation VBG angles, change α, VBG diffraction wavelength can be changed so that each wavelength components in positive first-order spectrum
Optical cavity is once fed back to, passive mode-locking pulse center wavelength continuous tuning is realized.In this programme, by adjusting VBG, it is possible to achieve
Continuous tuning of the mode locking pulse centre wavelength in 1011.9~1050.6nm.As foot part 4 is as follows：(1) in optical fiber laser
Using the method for inserting other tuning devices, overall laser structure is complicated, is lost larger.(2) lock is produced using said structure
Mould pulse laser, this scheme can not effectively suppress band inside mode locking pulse spectrum gram.
Prior art two：As shown in figure 3, a kind of tunable mode-locked optical fiber laser schematic diagram of utilization F-P wave filters.Its
In 1 be 1480nm pumping sources, 2 be 1480/1550nmWDM, and 3 be Er-doped fiber, and 4 be isolator, and 5 be 10:90 1 × 2 optical fiber
Coupler, 6 be F-P wave filters, and 7 be Polarization Controller, and 8 be isolator, and 9 be saturable absorber single-walled carbon nanotube.
Pump light is coupled into 10m Er-doped fibers by WDM, carries out pumping to it, forms population inversion in a fiber,
And there is ASE, radiation is wide to pass through one 10：90 fiber coupler, 10% output end of coupler provides laser output, 90%
Output end provides feedback, the laser of wavelength needed for being obtained by F-P tunable optic filters, by isolator, then via single wall carbon
Nanotube is modulated, then is coupled into Er-doped fiber via WDM, completes one cycle；The energy of light wave is equal in cyclic process each time
It is amplified, when gain is more than the transmission loss in loop, vibration is produced, so as to form ring-like er-doped mode-locked fiber lasers
Device.With the gradually increase of pump power, noise declines therewith, and this is due to that the increase of pump power adds population inversion
Play, so as to inhibit spontaneous radiation.The effect of isolator 4 and isolator 8 is to suppress ASE noises from forward and reverse respectively, is protected
Card and Unidirectional of the F-P filter transmission wavelength identical laser in ring-like chamber, improve laser signal to noise ratio.Pass through regulation
F-P wave filters, the wavelength of transmission changes, so as to obtain the laser output of the different centre wavelengths of 1.5 mu m wavebands.Weak point
It is as follows：(1) band inside mode-locked laser spectrum gram can not be suppressed.(2) ripple is realized by inserting F-P wave filters in laser cavity
Long tuning operation, laser structure is complicated, is lost larger.
The content of the invention
It is an object of the invention to：Solve the passive mode-locking fiber laser of tunable wave length in the prior art, be by
Independent wavelength tuning device insertion intracavitary realizes wavelength tuning, and complicated, cost is high, and the loss of intracavitary light energy is larger
The problem of there is provided it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser.
The technical solution adopted by the present invention is as follows：
It is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser, it is characterised in that：Bag
Include laser pumping source, the bundling device being connected with laser pumping source, the output coupling mirror being connected with bundling device, with output coupling
Condenser lens and wave filter that mirror is connected, the line style resonator being connected with condenser lens；
The line style resonator includes the gain fibre being connected with condenser lens, and first be connected with gain fibre is drawn
Fluoride fiber is bored, the second drawing cone fluoride fiber that cone fluoride fiber is connected is drawn with first, cone fluoride is drawn with second
The collimation focusing system that optical fiber is connected, the SESAM being connected with collimation focusing system.
Further, the line style resonator also includes V-groove, and the gain fibre and second draw cone fluoride fiber difference
It is arranged on a V-groove.
Further, the line style resonator also includes three-D displacement platform fiber clamp, and the gain fibre and first are drawn
Cone fluoride fiber is separately positioned on a three-D displacement platform fiber clamp.
Further, the gain fibre of one end of being connected with condenser lens is arranged on V-groove；It is connected with collimation focusing system
Connecing the second of one end draws cone fluoride fiber to be arranged on V-groove；Cone fluoride fiber is drawn to be connected the gain of one end with first
Optical fiber is arranged on three-D displacement platform fiber clamp, and three-D displacement platform light is arranged in the middle part of the first drawing cone fluoride fiber
On fine fixture.
Further, described first a diameter of 10 μm of cone waist for boring fluoride fiber is drawn, modulation period is about 30nm.
Further, described second cone fluoride fiber a diameter of 5 μm of waist of cone is drawn, modulation period is 3nm.
Further, the laser pumping source is two, using semiconductor laser, and wavelength is 1150nm or 976nm, two
The perpendicular angle of light direction of laser pumping source is set.
Further, the output coupling mirror is high to 1150nm wave bands thoroughly, high to 3000nm wave bands anti-；Or to 976nm wave bands
It is high saturating, it is high to 3000nm wave bands anti-.
Further, the focal length of the condenser lens is 12mm；The collimation focusing system is by a collimation lens and one
Condenser lens constitute, focal length is 12mm, wherein collimation lens with second draw cone fluoride fiber be connected, condenser lens and
SESAM is connected.
Further, the gain fibre is with the first drawing cone fluoride fiber and the second drawing cone fluoride fiber that cascade
Ho3+,Pr3+It is co-doped with fluoride fiber or Er3+Mix fluoride fiber.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, the present invention is drawing cone fluoride fiber structure to realize comb filter function using cascade, in optical fiber laser
Filter fiber is realized, simple in construction, the loss of intracavitary light energy is smaller, with low cost；
2nd, the present invention draws cone fluoride fiber as the light comb filtering device of 3 mu m waveband optical fiber lasers using cascade, obtains
It is 30nm to modulation period, filtering bandwidth is only 3nm filtering characteristic, you can realize that filters center accurately connects in 3 mu m wavebands
Continuous tuning operation；
3rd, the present invention draws cone fluoride fiber can be while tunable mode-locked pulse laser is produced by using cascade
Effectively suppress band inside spectrum gram；
4th, cascade tapered fiber proposed by the invention realizes that the function of tunable laser has as comb filter
Universality, different wave bands can be extended to according to actual needs.
Brief description of the drawings
Fig. 1 mixes ytterbium tunable optical fiber laser structural representation for Linear-Cavity in prior art one；
Fig. 2 is the angular relationship schematic diagram of reflective balzed grating, in prior art one；
Fig. 3 is the schematic diagram of the tunable mode-locked optical fiber laser based on F-P wave filters in prior art two；
Fig. 4 is structural representation of the invention；
Fig. 5 is Ho of the present invention3+,Pr3+It is co-doped with the energy level schematic diagram of ZBLAN optical fiber lasers；
Marked in Fig. 4：1 is laser pumping source, and 2 be bundling device, and 3 be output coupling mirror, and 4 be wave filter, and 5 be detector, 6
It is V-groove for condenser lens, 7,8 be gain fibre, and 9 be three-D displacement platform fiber clamp, and 10 be the first drawing cone fluorination object light
Fibre, 11 be the second drawing cone fluoride fiber, and 12 be SESAM, and 13 be collimation focusing system.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
It is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser include laser pumping source,
Bundling device, output coupling mirror, condenser lens, line style resonator, wave filter.Wherein line style resonator includes Ho3+,Pr3+It is co-doped with fluorine
Compound optical fiber, collimation focusing system and two sections of parameter differences draw cone fluoride fiber, V-groove, three-D displacement platform fibre clip
Tool and SESAM are used as true saturable absorber.The continuous pump light that laser pumping source is produced is by bundling device successively through exporting coupling
Close mirror and condenser lens is coupled into Ho3+,Pr3+Fluoride fiber is co-doped with, then through drawing cone fluorination object light through two sections of parameter differences successively
Fine, collimation focusing system and SESAM, concussion forms Mode-locked laser in line style resonator, and Mode-locked laser is returned along road
Return and pass through output coupling mirror output.
Examples of the present invention will be described by way of reference to the accompanying drawings.It is that one kind draws cone to be fluorinated based on cascade shown in Fig. 4
Infrared mode locked fiber laser in fine tunable of object light, including laser pumping source 1, the conjunction beam that is connected with laser pumping source 1
Device 2, the output coupling mirror 3 being connected with bundling device 2, the condenser lens 6 and wave filter 4 being connected with output coupling mirror 3, with gathering
The line style resonator that focus lens 6 are connected；The line style resonator includes the gain fibre 8 being connected with condenser lens, with increasing
The first drawing cone fluoride fiber 10 that beneficial optical fiber 8 is connected, fluorine is bored with the first the second drawing for drawing cone fluoride fiber 10 to be connected
Compound optical fiber 11, (collimation focusing system is by a standard for the collimation focusing system 13 being connected with the second drawing cone fluoride fiber 11
Straight lens and a condenser lens composition, are in optical fiber with the second effect of one for drawing cone fluoride fiber 11 to be connected
The light collimation of outgoing, so being collimation lens, another is that the collimated light beam collimated is focused on SESAM, so crying poly-
Focus lens), the SESAM12 (semiconductor saturable absorbing mirror) being connected with collimation focusing system 13.Wherein：Laser pumping source is adopted
The semiconductor laser for being 1150nm with 2 wavelength, PBS (polarization splitting prism) is as bundling device, and output coupling mirror is used can
It is high to 1150nm wave bands thoroughly, to the high anti-dichroic mirror of 3000nm wave bands, wave filter can filter section be 3000nm, Jiao of condenser lens
Away from for 12mm, fluoride fiber is Ho3+,Pr3+Fluoride fiber is co-doped with as gain fibre；Drawn in gain fibre endpiece
Bore the first of a diameter of 10 μm of waist and draw cone fluoride fiber, a diameter of 7 μ of cone waist that cone fluoride fiber endpiece is drawn is drawn first
The second of m draws cone fluoride fiber, and SESAM is saturable absorber.
Cone fluoride fiber 10 is drawn to draw cone fluoride fiber 11 to cascade with second by first in the present embodiment, wherein first draws
Bore a diameter of 10 μm of the cone waist of fluoride fiber 10, the periodicity spectrum according to caused by the linear sinusoidal spectral response of tapered fiber
Filter effect, the modulation period for calculating tapered fiber is about 30nm；Second draws 5 μm of the cone cone waist of fluoride fiber 11 diameter, calculates
Modulation period is obtained for 3nm.In gain fibre end, cascade draws this 2 kinds of modulation periods of different drawing cone fluoride fiber, makees
For the light comb filtering device of 3 mu m waveband optical fiber lasers, it is possible to obtain modulation period for 30nm, filtering bandwidth is only 3nm's
Filtering characteristic.
In the technical program, 2 wavelength penetrate pump light for 1150nm LD (semiconductor laser) perpendicular angle
Enter in PBS crystal, PBS crystal two beam pump lights are combined into as bundling device it is a branch of, by saturating, right to 1150nm wave band height
The high anti-dichroic mirror of 3000nm wave bands, now 1150nm pump lights pass through focal length and enter for 12mm output coupling Lens Coupling
Ho3+,Pr3+Fluoride fiber is co-doped with, as shown in figure 5, under 1150nm pumping light stimulus, Ho3+Swashed by ground state absorption (GSA)
It is dealt into high level5I6, then particle passes through on the energy level5I6Energy level transition is arrived5I7The laser that energy level produces 2.9 μm is exported, and Ho3+
Ion and Pr3+Energy transfer process (ET) between ion, is reduced5I7The population of energy level, solves 2.9 μm of laser outputs
Bottleneck；Light beam sequentially passes through the first drawing cone fluoride fiber 10 and second and draws cone fluoride fiber 11, and draws cone fluorine by second
The end of compound optical fiber 11 is exported, and focuses on true saturable absorber by the collimation focusing system that focal length is 12mm
On SESAM, modulate and reflect by SESAM, light beam is coupled into gain fibre again by backtracking, from output coupling lens
3 output 3000nm Mode-locked lasers, via 3000nm wave filters, into detector 5, detector 5, which is used to test to export, to swash
The parameter of light.Moved radially by adjusting three-D displacement platform fiber clamp 9, draw first cone fluoride fiber 10 and second to draw
Bore fluoride fiber 11 and carry out micro-stretching, it is micro- when drawing first cone fluoride fiber 10 to be carried out with the second drawing cone fluoride fiber 11
During stretching, cake resistancet drifts about (blue shift) to shortwave length direction；Drawn when reduction puts on the first drawing cone fluoride fiber 10 and second
When boring the radial pull on fluoride fiber 11, first draws cone fluoride fiber 10 to draw cone fluoride fiber 11 gradually extensive with second
Original state is arrived again, and cake resistancet drifts about (red shift) to long wave length direction.The first fluoride of cascade can be thus controlled to draw
Optical fiber and the second fluoride tapered fiber are bored as the cake resistancet of comb filter, so as to reach accurate control output laser center
The purpose of wavelength.Cone fluoride fiber is drawn to be realized in 3 mu m wavebands as wave filter by the use of cascade in the laser structure
Cardiac wave length can precision tuning, and tuning range up to 30nm a wide range of continuous tuning export.
Pumping source also can be 976nm LD in this programme, and gain fibre draws cone fluoride fiber and second with the first of cascade
Fluoride tapered fiber can be to mix Er3+Fluoride fiber, can similarly realize 3 mu m waveband centre wavelengths can precision tuning locked mode
Pulse laser.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode locked fiber laser, it is characterised in that：Including
Laser pumping source (1), the bundling device (2) being connected with laser pumping source (1), the output coupling mirror being connected with bundling device (2)
(3) condenser lens (6) and wave filter (4), being connected with output coupling mirror (3), the line style being connected with condenser lens (6) are humorous
Shake chamber；
The line style resonator includes the gain fibre (8) being connected with condenser lens (6), is connected with gain fibre (8)
First draws cone fluoride fiber (10), and the second drawing cone fluoride fiber that cone fluoride fiber (10) is connected is drawn with first
(11) the collimation focusing system (13) that cone fluoride fiber (11) is connected, is drawn with second, is connected with collimation focusing system (13)
The SESAM (12) connect.
2. it is according to claim 1 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The line style resonator also includes V-groove (7), and the gain fibre (8) and second draw cone fluorination object light
Fine (11) are separately positioned on a V-groove (7).
3. it is according to claim 2 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The line style resonator also includes three-D displacement platform fiber clamp (9), the gain fibre (8) and the
One draws cone fluoride fiber (10) to be separately positioned on a three-D displacement platform fiber clamp (9).
4. it is according to claim 3 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The gain fibre (8) of one end of being connected with condenser lens (6) is arranged on V-groove (7)；With collimation focusing
System (13) be connected one end second draw cone fluoride fiber (11) be arranged on V-groove (7)；Cone fluorination object light is drawn with first
Fine (10) be connected gain fibre (8) of one end is arranged on three-D displacement platform fiber clamp (9), and first draws cone fluorination object light
It is arranged in the middle part of fine (10) on three-D displacement platform fiber clamp (9).
5. according to claim 1,3 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared modelocked fiber swash
Light device, it is characterised in that：Described first draws a diameter of 10 μm of the cone waist of cone fluoride fiber (10), and modulation period is about 30nm.
6. it is according to claim 5 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：Described second draws cone fluoride fiber (11) a diameter of 5 μm of waist of cone, and modulation period is 3nm.
7. it is according to claim 6 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The laser pumping source (1) is two, using semiconductor laser, and wavelength is 1150nm or 976nm, two
The perpendicular angle of light direction of individual laser pumping source (1) is set.
8. it is according to claim 7 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The output coupling mirror (3) is high to 1150nm wave bands thoroughly, high to 3000nm wave bands anti-；Or to 976nm ripples
Section is high, high to 3000nm wave bands anti-.
9. it is according to claim 8 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared mode-locked fiber lasers
Device, it is characterised in that：The focal length of the condenser lens (6) is 12mm；The collimation focusing system (13) is by a collimation lens
With a condenser lens composition, focal length is 12mm, and wherein collimation lens draws cone fluoride fiber to be connected with second, is focused on saturating
Mirror is connected with SESAM (12).
10. it is according to claim 9 it is a kind of based on cascade draw cone fluoride fiber it is tunable in infrared modelocked fiber swash
Light device, it is characterised in that：The gain fibre (8) draws cone fluoride fiber (10) and second to draw cone fluoride with the first of cascade
Optical fiber (12) is Ho3+,Pr3+It is co-doped with fluoride fiber or Er3+Mix fluoride fiber.
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