CN109755850A - A kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity - Google Patents
A kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity Download PDFInfo
- Publication number
- CN109755850A CN109755850A CN201910174040.0A CN201910174040A CN109755850A CN 109755850 A CN109755850 A CN 109755850A CN 201910174040 A CN201910174040 A CN 201910174040A CN 109755850 A CN109755850 A CN 109755850A
- Authority
- CN
- China
- Prior art keywords
- microcavity
- fiber
- optical
- factor
- ultrafast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 114
- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 84
- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 230000010287 polarization Effects 0.000 claims abstract description 20
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 239000006096 absorbing agent Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- -1 pumping source Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 239000004005 microsphere Substances 0.000 claims description 19
- 239000006185 dispersion Substances 0.000 claims description 11
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 150000002910 rare earth metals Chemical class 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 2
- 241001046947 Ectropis obliqua Species 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000002071 nanotube Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 2
- 238000004891 communication Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 description 11
- 238000003466 welding Methods 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Natural products O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 238000001237 Raman spectrum Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 2
- 238000005311 autocorrelation function Methods 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000382 optic material Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Abstract
The invention discloses a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity, belongs to laser technology and non-linear optical field.This laser oscillator uses linear cavity configuration, it is main including mode locking element saturable absorber, pumping source, optical-fiber bundling device, the gain fibre for generating 2~5 mum lasers, dispersive compensation element, Polarization Controller, high q-factor microcavity, the microcavity of the high q-factor is echo wall mode optical micro-cavity, and quality factor Q value is not less than 106.The present invention utilizes the saturable absorption effect of saturable absorption crystal and the Raman scattering effect of high q-factor microcavity, increase intracavitary non-linear method instead of the optical fiber of traditional km magnitude length, it can produce relevant Mode-locked laser, and oscillation is directly realized by long wave Raman frequency shift in transit chamber, obtain high repetition rate, high-power 2~5 microns of ultrafast raman lasers；Present invention can apply to basic research, national defence, communication sensing, biologic medical and material processing and other fields.
Description
Technical field
The invention belongs to laser technology and non-linear optical fields, and in particular to a kind of middle infrared Raman based on microcavity is super
Fast fibre laser oscillator.
Background technique
Due to the characteristic of length flexible, Raman fiber lasers are constantly subjected to the concern of researchers.Currently, raman laser
Device wave-length coverage has covered visible light to middle infrared band, and can be more than kilowatt near infrared band peak power output.
The existing development of high power Raman fiber lasers technology has following characteristics: 1 puts power by multiple ultrafast seed sources
Big to realize high power Raman fiber lasers, this method needs multiple pumping sources and isolator, therefore cavity shape structure is complicated,
At high cost and reliability is low；Although 2 near infrared band, Yb3+Ion-doped optical fiber laser and Er3+Ion-doped optical fiber swashs
Light device can constitute oscillator by the long optical fibers of km magnitude, to be directly realized by the output of Raman ultrafast laser intracavitary；But
The long optical fibers of km magnitude cause the pulse recurrence frequency that the threshold value of raman laser is very high, obtains to open a hertz magnitude tens,
Lower than two magnitudes of usual mode locked fiber laser.The original that this exactly middle ultrafast fibre laser oscillator of infrared band Raman lacks
Cause.
It is still not carried out the report of 2~5 micron waveband Raman fiber laser oscillators at present, main there are two reasons: one
It is the Raman threshold since the nonlinear strength of light-matter interaction is inversely proportional (photon energy is directly proportional) to the wavelength of light
Value is increased as the wavelength of light increases；Second is that because with wavelength under 2 microns, this wave band sheet of the silica fibre to laser
Sign loss increases, and Raman threshold is more difficult to reach, therefore realizes that 2 micron waveband Raman ultrafast laser threshold values are high based on long optical fibers, knot
Structure is complicated.Because the repetition rate of pulse can be byIt is calculated.Wherein f is pulse recurrence frequency, and L indicates light humorous
Shake the primary light path of intracavitary contact, and c indicates the light velocity.Pulse recurrence frequency is inversely proportional with chamber length as shown from the above formula, therefore wants
Want to obtain high repetition frequency, it is long that Ying Jinliang shortens chamber.
Summary of the invention
In order to solve the problems, such as that the output of infrared Raman ultrafast laser leads to high threshold low-repetition-frequency in realizing by long chamber,
The present invention provides a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity.
To achieve the above object, The technical solution adopted by the invention is as follows: a kind of middle infrared Raman based on microcavity is ultrafast
Fibre laser oscillator mainly includes mode locking element saturable absorber, lens I, lens II, pumping using linear cavity configuration
Source, optical-fiber bundling device, gain fibre, dispersive compensation element, Polarization Controller, high q-factor microcavity, the microcavity of the high q-factor is
Echo wall mode optical micro-cavity, quality factor Q value are not less than 106；
The oblique angle that an angle [alpha] is 8 °~20 °, the emergent light at oblique angle are cut in the signal input part side of optical-fiber bundling device
Vertical directive lens centre, the i.e. angled one end in oblique angle pass through the lens focus of proper focal length to mode locking element saturable absorber
On, the straight angle end at oblique angle and the signal input part of optical-fiber bundling device connect to form resonance, and pumping source connects the pump of optical-fiber bundling device
Pu end, gain fibre one end connect the signal output end of optical-fiber bundling device, and the gain fibre other end connects dispersive compensation element one
End, the dispersive compensation element other end connect Polarization Controller one end, and the microcavity of high q-factor is connected to behind Polarization Controller, or
The microcavity of high q-factor is connected between optical-fiber bundling device and gain fibre or the microcavity of high q-factor is connected to gain fibre and dispersion
Between compensating element,.
Preferably, the microcavity of the high q-factor is microspheric, microtrabeculae type, micro- dish-type, micro-bubble, micro-pipe type or micro-loop type
One of.
Preferably, the material of the microcavity of the high q-factor is the low-loss quartz of 2 micron wavebands or the low damage of 3 micron wavebands
The silicon of consumption, germanium, calcirm-fluoride, one of infrared low-loss material in zinc selenide.
Preferably, the coupled modes of the microcavity of the high q-factor are coupled using tapered fiber or prism is to free space
One of coupling.
Preferably, the mode locking element saturable absorber is semiconductor saturable absorbing mirror, the suction of graphene saturable
Receive one of mirror, carbon nanotube saturable absorbing mirror or graphene oxide saturable absorbing mirror, working range covering 2~3
Micron waveband, the value range of modulation depth Δ R are 8%≤Δ R≤30%.
Preferably, the pumping source is diode-end-pumped source, and central wavelength lambda is 793nm or 976nm, excitation
Corresponding rare earth ion doped gain fibre generates the laser of 2~5 micron wavebands.
Preferably, the gain fibre is that rare earth list adulterates Tm3+Silica fibre or rare earth ion Tm3+、Ho3+It is co-doped with
Silica fibre, to generate 1.6~2.2 microns of laser or Er3+The fluoride fiber of doping, to generate 3 microns
Laser obtains single order Stokes laser and high-order Stokes laser using Raman frequency shift, that is, can produce 2~5 micron waves
Infrared ultrafast laser in long.
Preferably, the dispersive compensation element is dispersion compensating fiber or chirped fiber grating.
Further, the ultrafast fibre laser oscillator of middle infrared Raman based on microcavity further includes bandpass filter,
The bandpass filter is connected to outside resonant cavity.
Compared with prior art, the invention has the following beneficial effects:
1, good wavelength spread characteristic, and structure is simple, compact, wavelength switching is easy.Pass through excitation rare earth list doping
Tm3+Silica fibre or rare earth ion Tm3+、Ho3+The silica fibre being co-doped with provides the laser that gain generates 2 microns, passes through increasing
The length for subtracting gain fibre changes central wavelength and interacvity gain, by the Raman scattering effect of microcavity element, in intracavitary realization
Raman frequency shift can more realize that cascade Raman, Raman frequency shift keep laser mobile to long wave direction by increase pump power, thus
Exportable 2~3 microns of raman laser.Equally, by motivating Er3+The fluoride fiber of doping provides gain and generates 3 microns of left sides
Right laser can generate 3~5 microns of raman laser by Raman frequency shift.
2, the femtosecond laser of Gao Zhongying (nearly hundred megahertzs), high power laser light (watt grade) can be achieved.The present invention uses microcavity
Main components as offer Ramam effect.Microcavity has high Q value and extremely low optical nonlinearity threshold value, substantially reduces
The difficulty that middle infrared Raman laser is realized, and it can be directly realized by long wave Raman frequency shift to vibrate in transit chamber, it obtains tens of
Megahertz high repetition rate, high-power 2~5 microns of ultrafast raman lasers of watt grade level.And microcavity can pass through quartz
Or the common materials such as silicon are made, low in cost and simple process meets practical application request.
3, using simple linear structure, damage threshold is high, maintainable strong.Rare earth ion doped light is used in the present invention
The free space linear resonance structure that fine and oblique angle is constituted, linear cavity configuration are reduced costs without complicated isolating device.It is humorous
Vibration structure greatly improves energy needed for intracavitary raman laser generates, thus in improving infrared Raman laser oscillator it is defeated
Power and efficiency out.For the damage feature of saturable absorbing mirror, the free-space structure used, so that saturable absorbing mirror
Position is adjustable, so that middle infrared Raman laser oscillator maintainability is good, the service life is long.
4, the present invention generates ultra-short pulse laser using passive mode-locking technology, does not need extraneous additional modulation source, structure
Simply.For the present invention using saturable absorber as mode-locking device, mode locking performance is more stable.
Detailed description of the invention
Fig. 1 is the basic schematic diagram of middle infrared Raman ultrafast fibre laser oscillator of the embodiment of the present invention 1 based on microcavity；
Fig. 2 is conical fiber preparation facilities figure；
Fig. 3 is microspheric echo wall mode optical micro-cavity preparation facilities figure；
Fig. 4 is the microspheric echo wall mode optical micro-cavity microscope imaging figure with optical fiber handle of preparation；
Fig. 5 couples microscope figure with tapered fiber for microspheric echo wall mode optical micro-cavity；
Fig. 6, which is that the embodiment of the present invention 1 is expected, obtains mode locking pulse sequence chart；
Fig. 7, which is that the embodiment of the present invention 1 is expected, obtains Raman spectrogram；
Fig. 8 is the basic schematic diagram of middle infrared Raman ultrafast fibre laser oscillator of the embodiment of the present invention 2 based on microcavity；
Fig. 9 is micro- dish-type echo wall mode optical micro-cavity microscope imaging figure of preparation: (a) being overlooked, (b) main view；
Figure 10, which is that the embodiment of the present invention 2 is expected, obtains mode locking pulse sequence chart；
Figure 11, which is that the embodiment of the present invention 2 is expected, obtains Raman spectrogram.
In figure, 1- mode locking element saturable absorber, 2- lens I, 3- lens II, the oblique angle 4-, 5- pumping source, the conjunction of 6- optical fiber
Beam device, 7- gain fibre, 801- dispersion compensating fiber, 802- chirped fiber grating, 9- Polarization Controller, 101- microspheric echo
Wall mode optical micro-cavity, the micro- dish-type echo wall mode optical micro-cavity of 102-, 11- bandpass filter, 12- single mode optical fiber, 13- stepping
Motor, 14- computer, 15- motor driven, 16- camera, 17- three-dimensional mobile platform, 18- carbon dioxide laser, 19- are poly-
Focus lens, 20- optical fiber handle, 21- tapered fiber.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Embodiment 1 is based on the pumping of 2 micron wave lengths and generates 2~3 microns of Raman mode-locked lasers
A kind of ultrafast fibre laser oscillator structure of middle infrared Raman based on microcavity is as shown in Figure 1, comprising:
Mode locking element saturable absorber 1 selects the broadband semiconductor saturable absorbing mirror (SESAM) of 2 mu m wavebands,
The modulation depth range of SESAM is 8%≤Δ R≤30%, by increasing pump power come pulse energy in control chamber, makes pulse
When flux of energy reaches 3~5 times of saturation flux, the appropriate three-dimensional space position for adjusting SESAM is to reach mode locking；
Lens I 2, focal length 50mm；
Lens II 3, focal length 100mm；
Oblique angle 4 cuts the oblique angle that an angle is 8 °~20 ° using optical fiber oblique angle cutter to prevent Laser feedback, keeps away
Exempt from F-P effect and destroys mode-lock status.
Pumping source 5, selecting central wavelength is the diode-end-pumped source of 793nm, and peak power output 30W can
Corresponding gain fibre is motivated to generate the laser of 2 micron wavebands；
Optical-fiber bundling device 6, selects (2+1) × 1 silica fibre bundling device, and bundling device pumps end and LD tail optical fiber using welding
Mode connects；
Gain fibre 7 selects rare earth list to adulterate Tm3+Silica fibre or rare earth ion Tm3+、Ho3+The silica fibre being co-doped with；
Dispersive compensation element selects UHNA4 dispersion compensating fiber 801, to adjust the non-linear phase with dispersion in resonant cavity
To balance, to realize the tunable of pulse width；
Polarization Controller 9, selects manual Polarization Controller or electronic Polarization Controller, and the present embodiment is used and manually polarized
Controller, pulls optical fiber by rotatory polarization control sheet to change intracavitary unpolarized state, at low cost and flexible operation,
Facilitate fixation after adjusting suitable polarization state, to enhance the stability of system；
The microcavity of high q-factor selects microspheric echo wall mode optical micro-cavity 101；
The oblique angle 4 that an angle is 8 °~20 ° is cut in the signal input part of (2+1) × 1 optical-fiber bundling device 6 to prevent from swashing
Light feedback, avoids F-P effect from destroying mode-lock status；The angled one end in oblique angle 4 passes sequentially through the lens II 3 that focal length is 100mm, coke
Away from focusing on semiconductor saturable absorbing mirror 1 after the lens I 2 for 50mm, make the light for being incident on semiconductor saturable absorbing mirror 1
Spot energy is bigger, conducive to modelocking threshold is reached；The straight angle end at oblique angle 4 and the signal input part of (2+1) × 1 optical-fiber bundling device 6 connect
It connects to form resonance, diode-end-pumped source 5 is connect with the pumping end of (2+1) × 1 optical-fiber bundling device 6,7 one end of gain fibre
It is connect with the signal output end of (2+1) × 1 optical-fiber bundling device 6,7 other end of gain fibre is sequentially connected dispersion compensation light in order
Fibre 801, Polarization Controller 9 and microspheric echo wall mode optical micro-cavity 101, in microspheric echo wall mode optical micro-cavity 101
Output end is in such a way that fiber end face directly exports, to make a kind of ultrafast optical-fiber laser vibration of the middle infrared Raman based on microcavity
Swing device output high-power raman laser.Connection one bandpass filter 11 for 2 micron wavebands can get specific outside resonant cavity
The output of the raman laser of wavelength.Optical fiber between all optical elements is attached by way of common welding.
Wherein, the preparation method of microspheric echo wall mode optical micro-cavity is high-temperature fusion cooling method, the specific steps are as follows:
It draws cone method to prepare conical fiber using flame first: a single-mode fiber 12 being removed into coat and uses alcohol wipe
It after clean, is fixed on a pair of of stepper motor 13 with fixture, stepper motor 13 controls motor driven 15, a fire by computer 14
Flame nozzle is fixed on immediately below single mode optical fiber 12, and experiment adjusts flame size when starting, and is in optical fiber in flame envelope, and stepping is arranged
Motor 13, mutually from movement, is driven optical fiber to stretch to both ends, gradually forms pyramidal structure, 16 feedback image of camera with identical speed
Information is to computer 14.Pass through the state modulators overall processes such as the step-length of control stepper motor 13 and movement speed, preparation in experiment
The tapered fiber of various structures parameter out；Tapered fiber preparation facilities figure such as Fig. 2.
After drawing cone method to prepare conical fiber using flame, it is cut, obtained single cone optical fiber is fixed on three
It ties up on mobile platform 17, the laser that carbon dioxide laser 18 issues focuses on the one end cut by condenser lens 19 and carries out
Heating, optical fiber can upsweep automatically under the action of surface tension to form spherical, and one will be obtained after cooling with optical fiber
The microspheric microcavity 101 of handle 20,16 feedback image information of camera is to computer 14.The ball-type prepared with this method is micro-
Chamber uniformity is preferable, surface smoother, has one section of optical fiber handle 20, is easy to manipulate.Fig. 3 show microspheric Whispering-gallery-mode
Optical microcavity preparation facilities figure.It is micro- that Fig. 4 show the microspheric echo wall mode optical micro-cavity with optical fiber handle that experiment is prepared
Chamber microscope imaging figure, diameter are 50 μm, and measuring its Q value is 106。
Microspheric microcavity coupled modes in embodiment 1 are to be coupled using tapered fiber, by the fibre of tapered fiber 21
Core diameter is pulled to 2 microns to guarantee to have enough light to be coupled to microspheric echo wall mode optical micro-cavity from tapered fiber 21
In 101, coupling ratio, this side are controlled at a distance from conical fiber by controlling microspheric echo wall mode optical micro-cavity 101
Formula coupling efficiency is high, and easy to operate, and it is as shown in Figure 5 that microballoon with tapered fiber couples microscope figure.
The present invention is based on the ultrafast fibre laser oscillator of middle infrared Raman of microcavity by increase and decrease gain fibre length and
Adjust gain fibre doping concentration of rare earth ion, it can be achieved that central wavelength tuning, adjustable range be 1.8~2 microns；Pass through
The Raman scattering effect of microcavity element, can be in intracavitary realization Raman frequency shift；By the coupling effect for increasing pump power and Microsphere Cavities
Rate is, it can be achieved that the control of raman scattering intensity is drawn to realize conversion of the single order Raman to Higher-order Raman to can get 2~3 microns
Graceful laser.The bandpass filter for adding 2 micron wavebands outside chamber, can be obtained the raman laser of the specific band of needs.
The present invention is based on the ultrafast fibre laser oscillator of middle infrared Raman of microcavity can (speed of detection be by oscillograph
1GHz) observe mode locking pulse figure, mode locking pulse figure is as shown in fig. 6, pulse mode is stablized, and repetition rate is 16MHz.It can lead to
It crosses spectrometer (measurement wave band is 1600nm-3400nm) and observes Raman spectrum.The frequency of Raman caused by different fiber optic materials
Difference is moved, but the Raman frequency shift value of same material is fixed and invariable, it is unrelated with lambda1-wavelength variation, it can be according to formulaCalculate Raman fiber lasers the i-th rank Stokes laser output wavelength λi, wherein λi-1For incident light wave
Long, Δ s is the Raman frequency shift amount of optical fiber used, and the Raman frequency shift of silica fibre is 13.2THz (440cm-1).In embodiment 1
It is contemplated that raman laser can be observed in 2150nm wave band on spectrometer, it is contemplated that the spectrogram of acquisition is as shown in Figure 7.Meanwhile it using
Autocorrelation function analyzer further measures the pulse width and minor structure of the ultrafast pulse of acquisition.
Embodiment 2 is based on the pumping of 3 micron wave lengths and generates 3~5 microns of raman lasers
A kind of ultrafast fibre laser oscillator structure of middle infrared Raman based on microcavity is as shown in Figure 8, comprising:
Mode locking element saturable absorber 1 selects the broadband semiconductor saturable of 3 mu m wavebands (2000nm~3400nm) to inhale
It receives mirror (SESAM), the modulation depth range of SESAM is 8%≤Δ R≤30%, by increasing pump power come arteries and veins in control chamber
Energy is rushed, when pulse energy flux being made to reach 3~5 times of saturation flux, the appropriate three-dimensional space position for adjusting SESAM is to reach
To mode locking；
Lens I 2, focal length 50mm；
Lens II 3, focal length 100mm；
Oblique angle 4 cuts the oblique angle that an angle is 8 °~20 ° using optical fiber oblique angle cutter to prevent Laser feedback, keeps away
Exempt from F-P effect and destroys mode-lock status.
Pumping source 5, selecting central wavelength is the diode-end-pumped source of 976nm, and peak power output 30W can
Corresponding gain fibre is motivated to generate the laser of 3 micron wavebands；
Optical-fiber bundling device 6 selects (2+1) × 1 fluoride fiber bundling device, and wherein the pumping end of bundling device is adopted with LD tail optical fiber
It is connected with the mode of mechanical splice；
Gain fibre 7 selects rear-earth-doped Er3+Fluoride fiber, Er3+The molar concentration range of doping can for 7%~
20%, mole doping concentration of the present embodiment selection 7%；
Dispersive compensation element, the dispersion in 802 compensated cavity of chirped fiber grating for selecting fluoride fiber to carve, thus to adjust
The non-linear relative equilibrium with dispersion in resonant cavity is saved, realizes the tunable of pulse width；
Polarization Controller 9, selects manual Polarization Controller or electronic Polarization Controller, and the present embodiment is used and manually polarized
Controller, pulls optical fiber by rotatory polarization control sheet to change intracavitary unpolarized state, at low cost and flexible operation,
Facilitate fixation after adjusting suitable polarization state, to enhance the stability of system；
The microcavity of high q-factor selects micro- dish-type echo wall mode optical micro-cavity of calcium fluoride crystal preparation.
The oblique angle 4 that an angle is 8 °~20 ° is cut in the signal input part of (2+1) × 1 optical-fiber bundling device 6 to prevent from swashing
Light feedback, avoids F-P effect from destroying mode-lock status；The angled one end in oblique angle 4 passes sequentially through the lens II 3 that focal length is 100mm, coke
Away from focusing on semiconductor saturable absorbing mirror 1 after the lens I 2 for 50mm, make the light for being incident on semiconductor saturable absorbing mirror 1
Spot energy is bigger, conducive to modelocking threshold is reached；The straight angle end at oblique angle 4 and the signal input part of (2+1) × 1 optical-fiber bundling device 6 are logical
The mode for crossing welding connects to form resonance, and diode-end-pumped source 5 and the pumping end of (2+1) × 1 optical-fiber bundling device 6 pass through
The mode of mechanical splice connects, the side that the signal output end of 7 one end of gain fibre and (2+1) × 1 optical-fiber bundling device 6 passes through welding
Formula connection, the mode that 7 other end of gain fibre passes sequentially through welding in order connect dispersion compensation chirped fiber grating 802, lead to
The mode Polarization Controller 9 for crossing mechanical splice connects micro- dish-type echo wall mode optical micro-cavity with by way of mechanical splice
102, in micro- 102 output end of dish-type echo wall mode optical micro-cavity in such a way that fiber end face directly exports, to make one kind
The ultrafast fibre laser oscillator output high-power raman laser of middle infrared Raman based on microcavity.Connecting one outside resonant cavity is
The bandpass filter 11 of 3 micron wavebands can get the output of the raman laser of specific wavelength.
Wherein the micro- dish-type echo wall mode optical micro-cavity 102 of calcirm-fluoride is using the monocrystal calcium fluoride of high-purity as basic
Material, by cutting, grinding and polishing and etc. preparation gained.Micro- dish-type echo wall mode optical micro-cavity 102 of preparation is shown
Micro mirror image is as shown in Figure 9, it can be seen that diameter is 5 millimeters, and with a thickness of 1 millimeter, Q value is 106。
The present invention is based on micro- dish-type microcavity couplings in the ultrafast fibre laser oscillator embodiment 2 of the middle infrared Raman of microcavity
Mode is tapered fiber coupling, and tapered fiber 23 is fluoride fiber herein, by the core diameter of tapered fiber 23 in the present invention
2 microns are pulled to guarantee to have enough light to be coupled to micro- dish-type echo wall mode optical micro-cavity from tapered fiber 23
In 102, coupling ratio is controlled at a distance from conical fiber 23 by controlling micro- dish-type echo wall mode optical micro-cavity 102, it is this
Mode coupling efficiency is high, and easy to operate.
The present invention is based on the ultrafast fibre laser oscillator of middle infrared Raman of microcavity by increase and decrease gain fibre length and
Adjust the Er of gain fibre3+Doping concentration, it can be achieved that central wavelength tuning, tuning range be 2.7~2.9 microns.Different materials
It is connected by the way of mechanical splice between the optical fiber of material.
The present invention is based on the ultrafast fibre laser oscillators of middle infrared Raman of microcavity to be imitated by the Raman scattering of microcavity element
It answers, it can be in intracavitary realization Raman frequency shift.By the coupling efficiency of increase pump power and Microsphere Cavities, it can be achieved that the control of raman scattering intensity
System can get the raman laser of 3 microns and more long-wave band to realize conversion of the single order Raman to Higher-order Raman.In output end
The bandpass filter 11 for adding 3 micron wavebands, can be obtained the raman laser of the specific band of needs.
The present invention is based on the ultrafast fibre laser oscillators of middle infrared Raman of microcavity, and mode locking arteries and veins can be observed by oscillograph
Punching figure, it is contemplated that obtained mode locking pulse figure is as shown in Figure 10, and pulse mode is stablized, and repetition rate passes through formulaIt calculates
Out.Wherein f is pulse recurrence frequency, and L indicates that the light path of light round trip in resonant cavity, c indicate the light velocity, be in embodiment 2
30MHz.Raman spectrum can be observed by spectrometer, wherein the Raman frequency shift value of fluoride fiber is 17.4THz (580cm-1)。
It is contemplated that 3430nm nearby observes single order raman laser figure on spectrometer in embodiment 2, it is contemplated that the spectrogram of acquisition such as Figure 11
It is shown.Meanwhile the pulse width and minor structure of the ultrafast pulse of acquisition can be further measured using autocorrelation function analyzer.
In addition to the optical microcavity of the microspheric, micro- dish-type that refer in above-described embodiment, optical microcavity can also select microtrabeculae
One of type, micro-bubble, micro-pipe type or micro-loop type, as long as guaranteeing that the quality factor Q value of microcavity is not less than 106?.Wherein
The diameter of micro-loop type optical microcavity should be not less than 500 microns, guarantee that microcavity has more model number in gain band.
Claims (9)
1. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity, which is characterized in that linear cavity configuration is used, it is main
It to include mode locking element saturable absorber (1), lens I (2), lens II (3), pumping source (5), optical-fiber bundling device (6), gain
Optical fiber (7), dispersive compensation element, Polarization Controller (9), high q-factor microcavity, the microcavity of the high q-factor is Whispering-gallery-mode light
Microcavity is learned, quality factor Q value is not less than 106；
The oblique angle (4) that an angle [alpha] is 8 °~20 ° is cut in the signal input part side of optical-fiber bundling device (6), oblique angle (4)
The vertical directive lens centre of emergent light, i.e. oblique angle (4) angled one end are first to mode locking by the lens focus of two proper focal lengths
On part saturable absorber (1), the straight angle end of oblique angle (4) connect to form resonance with the signal input part of optical-fiber bundling device (6), pump
Pu source (5) connects the pumping end of optical-fiber bundling device (6), and gain fibre (7) one end connects the signal output of optical-fiber bundling device (6)
End, gain fibre (7) other end connect dispersive compensation element (8) one end, and dispersive compensation element (8) other end connects Polarization Control
Device (9) one end, the microcavity (10) of high q-factor is connected to Polarization Controller (9) below or the microcavity (10) of high q-factor is connected to light
Between fine bundling device (6) and gain fibre (7) or the microcavity (10) of high q-factor is connected to gain fibre (7) and dispersion compensation member
Between part (8).
2. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1, feature exist
In the microcavity of the high q-factor is one of microspheric, microtrabeculae type, micro- dish-type, micro-bubble, micro-pipe type or micro-loop type.
3. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
Be, the material of the microcavity of the high q-factor be the low-loss quartz of 2 micron wavebands or the low-loss silicon of 3 micron wavebands, germanium,
One of infrared low-loss material in calcirm-fluoride, zinc selenide.
4. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, the coupled modes of the microcavity of the high q-factor are coupled using tapered fiber or prism is to one in free space coupling
Kind.
5. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, the mode locking element saturable absorber (1) is semiconductor saturable absorbing mirror, graphene saturable absorbing mirror, carbon
One of nanotube saturable absorbing mirror or graphene oxide saturable absorbing mirror, working range cover 2~3 micron waves
Section, the value range of modulation depth Δ R are 8%≤Δ R≤30%.
6. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, the pumping source (3) is diode-end-pumped source, and central wavelength lambda is 793nm or 976nm.
7. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, the gain fibre (4) is that rare earth list adulterates Tm3+Silica fibre or rare earth ion Tm3+、Ho3+The quartzy light being co-doped with
Fibre or Er3+The fluoride fiber of doping.
8. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, the dispersive compensation element is dispersion compensating fiber (801) or chirped fiber grating (802).
9. a kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity according to claim 1 or 2, feature
It is, further includes bandpass filter (11), the bandpass filter (11) is connected to outside resonant cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174040.0A CN109755850B (en) | 2019-03-08 | 2019-03-08 | Intermediate infrared Raman ultrafast fiber laser oscillator based on micro-cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174040.0A CN109755850B (en) | 2019-03-08 | 2019-03-08 | Intermediate infrared Raman ultrafast fiber laser oscillator based on micro-cavity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109755850A true CN109755850A (en) | 2019-05-14 |
| CN109755850B CN109755850B (en) | 2020-01-03 |
Family
ID=66407007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910174040.0A Active CN109755850B (en) | 2019-03-08 | 2019-03-08 | Intermediate infrared Raman ultrafast fiber laser oscillator based on micro-cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109755850B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555109A (en) * | 2020-04-16 | 2020-08-18 | 清华大学 | Dissipative gain coupled microcavity system |
| CN113507039A (en) * | 2021-05-13 | 2021-10-15 | 华东师范大学 | Single-mode micro laser based on single whispering gallery mode optical microcavity and implementation method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8207002B2 (en) * | 2005-02-16 | 2012-06-26 | The Trustees Of Columbia University In The City Of New York | All-silicon raman amplifiers and laser based on micro ring resonators |
| CN105024269A (en) * | 2015-07-10 | 2015-11-04 | 北京大学 | Free-space optical micro-cavity Raman laser sensing device and sensing method thereof |
| US20150314134A1 (en) * | 2014-05-02 | 2015-11-05 | Krzysztof Slawomir Nowicki | Method of generating life sustaining energy in the terminal and respiratory bronchioles system (trbs) |
| CN204927802U (en) * | 2015-07-03 | 2015-12-30 | 安徽大学 | Tunable optical microcavity raman laser and tunable optical microcavity doping laser instrument |
| CN105731785A (en) * | 2016-04-26 | 2016-07-06 | 江苏师范大学 | Atmosphere protection type chalcogenide glass optical fiber tapering device and use method |
| CN106785861A (en) * | 2017-03-01 | 2017-05-31 | 太原理工大学 | Gao Zhongying ultra-short pulse generation method and device based on Graphene microcavity locked mode |
| CN107046221A (en) * | 2017-02-24 | 2017-08-15 | 南京邮电大学 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
-
2019
- 2019-03-08 CN CN201910174040.0A patent/CN109755850B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8207002B2 (en) * | 2005-02-16 | 2012-06-26 | The Trustees Of Columbia University In The City Of New York | All-silicon raman amplifiers and laser based on micro ring resonators |
| US20150314134A1 (en) * | 2014-05-02 | 2015-11-05 | Krzysztof Slawomir Nowicki | Method of generating life sustaining energy in the terminal and respiratory bronchioles system (trbs) |
| CN204927802U (en) * | 2015-07-03 | 2015-12-30 | 安徽大学 | Tunable optical microcavity raman laser and tunable optical microcavity doping laser instrument |
| CN105024269A (en) * | 2015-07-10 | 2015-11-04 | 北京大学 | Free-space optical micro-cavity Raman laser sensing device and sensing method thereof |
| CN105731785A (en) * | 2016-04-26 | 2016-07-06 | 江苏师范大学 | Atmosphere protection type chalcogenide glass optical fiber tapering device and use method |
| CN107046221A (en) * | 2017-02-24 | 2017-08-15 | 南京邮电大学 | A kind of single-frequency narrow band fiber laser based on the high symmetrical microcavity of circularity three-dimensional rotation |
| CN106785861A (en) * | 2017-03-01 | 2017-05-31 | 太原理工大学 | Gao Zhongying ultra-short pulse generation method and device based on Graphene microcavity locked mode |
Non-Patent Citations (3)
| Title |
|---|
| HAISHENG RONG 等: ""low threshold continuous wave raman silicon laser"", 《NATURE》 * |
| SHUISEN JIANG 等: ""cascaded brillouin,raman,and four-wave-mixing generation in a 1.06μm microsphere feedback yb-fiber laser"", 《IEEE》 * |
| 王聪 等: ""基于二氧化硅球微腔与锥形光纤耦合系统的掺铒光纤激光器"", 《浙江师范大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555109A (en) * | 2020-04-16 | 2020-08-18 | 清华大学 | Dissipative gain coupled microcavity system |
| CN111555109B (en) * | 2020-04-16 | 2021-07-06 | 清华大学 | Dissipative gain coupled microcavity system |
| CN113507039A (en) * | 2021-05-13 | 2021-10-15 | 华东师范大学 | Single-mode micro laser based on single whispering gallery mode optical microcavity and implementation method |
| CN113507039B (en) * | 2021-05-13 | 2022-07-08 | 华东师范大学 | Single-mode micro-laser based on single whispering gallery mode optical microcavity and implementation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109755850B (en) | 2020-01-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106848823B (en) | 8-shaped cavity mode locking column vector fiber laser based on mode selection coupler | |
| CN106711745A (en) | Wide-tuning and narrow-linewidth nanosecond pulse double-resonance medium-infrared parameter oscillator | |
| CN106856292B (en) | 2 mu m waveband pure-tone pulse optical parametric oscillator of injection seeded based on heterodyne beat locking | |
| CN103414093A (en) | All-fiber pulsed laser | |
| CN106877121B (en) | Pulse width tuning laser based on light-operated graphene Chirp Bragg grating | |
| CN104134927A (en) | Nonlinear effect Q-switched fiber laser | |
| CN103633545A (en) | Difference-frequency tunable single-frequency terahertz source with external cavity strengthened | |
| CN104733993A (en) | Saturable absorption optical fiber based all-fiber multi-wavelength passive Q-switched laser | |
| CN109755850A (en) | A kind of ultrafast fibre laser oscillator of middle infrared Raman based on microcavity | |
| CN101609243B (en) | Terahertz-wave parametric oscillator based on corner-cube prism resonant cavity | |
| CN104409952A (en) | Double-cladding thulium-doped all-fiber ultrafast laser based on nonlinear polarization rotation mode locking | |
| CN110323663B (en) | Device and method for generating vector ultrashort laser pulse of intermediate infrared band | |
| CN113451869B (en) | Method for generating double-optical comb and multi-optical comb by single cavity | |
| KR20140052116A (en) | Method and apparatus to generate high power femtosecond light pulses by combining nonlinear polarization rotation and saturable absortion | |
| CN112217089B (en) | Tunable soliton frequency comb generating device based on surface rare earth ion doped microcavity | |
| CN106159650A (en) | A kind of Optical devices of the Er-doped fiber femtosecond light comb generator of miniaturization | |
| CN102332676A (en) | Mid-infrared fiber laser | |
| CN103647209A (en) | External cavity enhanced difference frequency tunable single-frequency terahertz source | |
| Li et al. | 93.7 W 1112 nm diode-side-pumped CW Nd: YAG laser | |
| CN109273973A (en) | A kind of dissipative solitons laser of 2 micron waveband | |
| CN102394466B (en) | All-fiber thulium-mixed laser with tunable wide brand | |
| Luo et al. | Multi-wavelength erbium-doped fiber ring laser based on wavelength-dependent polarization rotation with a phase modulator and an in-line comb filter | |
| CN110380324B (en) | Ultrashort pulse fiber laser | |
| CN103872558A (en) | All-fiber double-wavelength mid-infrared laser | |
| CN208589637U (en) | A kind of column vector beam actively Q-switched optical fiber laser based on fiber fuse mode conversion separator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240103 Address after: No. 1, Floor 1, Unit 1, Building 9, No. 1, Chengfei Avenue, Qingyang District, Chengdu, Sichuan 610000 Patentee after: Chengdu Liyuan Optoelectronic Technology Co.,Ltd. Address before: 221116 No. 101, Shanghai Road, Copper Mt. New District, Jiangsu, Xuzhou Patentee before: Jiangsu Normal University |