CN104577677A - Cascading photonic crystal fiber laser device - Google Patents
Cascading photonic crystal fiber laser device Download PDFInfo
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- CN104577677A CN104577677A CN201510031349.6A CN201510031349A CN104577677A CN 104577677 A CN104577677 A CN 104577677A CN 201510031349 A CN201510031349 A CN 201510031349A CN 104577677 A CN104577677 A CN 104577677A
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Abstract
A cascading photonic crystal fiber laser device is composed of a pumping source and a cascading quartz photonic crystal fiber laser without a welding spot in series. The cascading photonic crystal fiber laser device can conduct a wavelength conversion of main energy of an ultrafast fiber laser which has a central wavelength located near 1050 nm, and to obtain a broadband luminous cascading photonic crystal fiber laser within 400-800 nm visible-light range.
Description
Technical field
The present invention relates to fiber laser, particularly a kind of cascade-connection photon crystal fiber laser.
Background technology
Super continuous spectrums laser is the broad band laser light source of the non-linear phenomena manufacture utilized in optical fiber.The generation of super continuous spectrums is that spectrum is converted to the phenomenon of wideband light source by laser of narrowband when high power ultrafast laser is by one section nonlinear dielectric (normally optical fiber).In this wideband light source, the broadening of spectrum and the generation of new frequency content are mainly based on the acting in conjunction of the nonlinear effects such as the dispersion of optical fiber and such as Self-phase modulation, Cross-phase Modulation, four wave mixing, stimulated Raman scattering.Because the condition produced required for new spectral component is not easy to meet, obtain visible light wave range by the pump light near common 1060nm, especially the super continuous spectrums of shortwave royal purple optical range still needs the optical fiber of particular design and special technology.
In the experiment that the people (see Laser Phys.Lett.10 (2013) 085401) such as H H.Chen report, by the mode to one section of existing photonic crystal fiber (hereinafter referred to as PCF) succeeding stretch, obtain the cascaded optical fiber with multiple conical section, and therefrom obtain the super continuous spectrums containing royal purple light.Its spreading process comprises three parts, is first to be less than in the PCF1 of 1064nm a zero-dispersion wavelength (ZDW) to obtain arrowband super continuous spectrums.Second step injects this arrowband super continuous spectrums and draws the PCF1 of cone to obtain the further broadening of spectrum to the process that has shorter ZDW.3rd step injects the light that second step obtains the PCF2 drawing cone that has different air filling fraction, obtains shortwave spectral component.The preparation of this special conical fiber is carried out after fibre-optical drawing completes.The making in tapering is realized by pressurizeing to a part of PCF, heat and stretch.The super continuous spectrums produced is between 352nm to 1750nm, but the later spectrum of 1000nm includes higher energy, and the light generally than visible-range will exceed 5 to 10dB.
Summary of the invention
The present invention is intended to solve visible-range super continuous spectrums and is not easy to obtain, and the problem that energy utilization efficiency is not high, provides a kind of cascade-connection photon crystal fiber laser, and the average power realizing spectral region 400nm-800nm reaches the super continuous spectrums Laser output of watt level.
Technical solution of the present invention is as follows:
A kind of cascade-connection photon crystal fiber laser, its feature be by pumping source and no-welding-spot cascade quartz photonic crystal fiber in series, described pumping source be 1064nm mix ytterbium psec fiber laser, described no-welding-spot cascade quartz photonic crystal fiber is a kind of microstructured optical fibers based on quartz material and containing airport, this optical fiber has three stage structure in the direction of propagation of light: prime optical fiber, intermediate transition optical fiber and rear class optical fiber, described prime optical fiber has the core size of 2 ~ 4 microns, footpath-the gap ratio of airport is 0.3 ~ 0.5, described rear class optical fiber has the core diameter of the submicron order of 0.85 to 1 micron, footpath-the gap ratio of airport is 0.9 ~ 0.95, intermediate transition optical fiber is tapered.
The main body of described no-welding-spot cascade quartz photonic crystal fiber is the airport of equilateral triangle arrangement, background material is pure quartz glass, centered by wherein any one airport, six airports of its next-door neighbour become regular hexagon to arrange, and described airport has nine layers.
The output tail optical fiber and the direct welding of cascade quartz photonic crystal fiber of mixing ytterbium psec fiber laser, by commercial heat sealing machine, form by described ytterbium psec fiber laser and the cascade quartz photonic crystal fiber mixed.
Technique effect of the present invention
The present invention can realize the cascade-connection photon crystal fiber laser of spectral region 400nm-800nm.The quartzy photonic crystal fiber of this cascade does not have solder joint.The visible light wave range spectrum produced can concentrate that >50%'s be coupled into pumped fiber luminous power, is a kind of wavelength convert scheme efficiently.1064nm laser developments as pumping source is ripe, easily can obtain the coupled power of more than 2W in a fiber, therefore this programme can realize at visible-range the power being greater than 1W.
The mechanism that two-stage spectrum widening in the present invention utilizes is: prime optical fiber utilizes orphan's capture effect that pump energy is moved to shortwave direction.Occur in the soliton self-frequency sh based on excited Raman effect of optical fiber the anomalous dispersion region, slow down the group velocity of orphan, make orphan can be overlapping in time domain with the dispersive wave in short wavelength direction, by the nonlinear interaction such as Cross-phase Modulation and four wave mixing mechanism, most pump energy is passed to the dispersive wave between 500-700nm, and the short wavelength position matched in the limit range with soliton self-frequency sh forms stable pulse peak.Rear class optical fiber utilizes the input of prime optical fiber, continues at visible-range stretched-out spectrum.
Accompanying drawing explanation
Fig. 1 is laser schematic diagram of the present invention
Fig. 2 is optical fiber structure figure of the present invention
Fig. 3 is fiber cross-sections figure of the present invention
Fig. 4 is optical fiber dispersion figure
Fig. 5 be prime Optical Fiber Transmission 0.5m after spectrogram
Fig. 6 be rear class Optical Fiber Transmission 4mm after spectrogram
Embodiment
In an embodiment, fiber laser adopts MenloSystems company Orange FemtosecondYtterbium Laser laser system.Cascade-connection photon crystal fiber laser of the present invention, comprise and be positioned at Yb dosed optical fiber picosecond laser near 1064nm as pumping source, and with cascade-connection photon crystal optical fiber two parts (see Fig. 1) of the direct welding of the tail optical fiber of Yb dosed optical fiber picosecond laser.So feature is utilizing the non-linear quartzy photonic crystal fiber of the cascade of no-welding-spot as nonlinear dielectric, the cascade-connection photon crystal fiber laser of pump energy broadening within the scope of 400-800nm being greater than 50%.
By pumping source and no-welding-spot cascade quartz photonic crystal fiber in series, described pumping source be 1064nm mix ytterbium psec fiber laser, described no-welding-spot cascade quartz photonic crystal fiber is a kind of microstructured optical fibers based on quartz material and containing airport.Utilize the nonlinear effect of pumping source in microstructured optical fibers, the pump energy of 1064nm is transformed into the visible-range of 400 to 800nm, limit of visible spectrum internal power can reach 1W rank.
The main body of described cascade-connection photon crystal optical fiber is the airport of equilateral triangle arrangement, and background material is pure quartz glass.By having the prime optical fiber of different air filling fraction, the tapered transition portion of rear class optical fiber and centre forms.Refer to Fig. 2.The profile of prime optical fiber and rear class optical fiber refers to Fig. 3.In this structure, the pitch of holes of adjacent vacant pore is Λ, and the diameter of circular airport is d.Prime optical fiber has the core size of 2-4 micron, less aperture-the gap ratio of the air between 0.3 to 0.5 (d/ Λ), so that optical fiber second zero-dispersion wavelength is moved to long wave direction, make the soliton self-frequency sh not premature end because entering normal dispersion region, to realize and the dispersive wave Group-velocity Matching in more shortwave direction, energy is moved to short wavelength as far as possible.This one-level optical fiber needs the length of 40-70 centimetre to realize spectrum widening.Rear class optical fiber has the core diameter of the submicron order of 0.85 to 1 micron, larger aperture-the gap ratio of the air between 0.9 to 0.95 (d/ Λ), with by strong waveguide dispersion balancing material dispersion, make the first zero-dispersion wavelength of optical fiber between 500-700nm, the super continuous spectrums pulse utilizing first order optical fiber to export is made pumping source by it, the pumping of this nearly zero-dispersion wavelength can obtain wide and smooth super continuous spectrums type, realizes the broadening of the super continuous spectrums within the scope of 400-800nm.Smaller core size makes this section of optical fiber have larger non linear coefficient, needs the several centimetres of broadenings realizing spectrum.
No-welding-spot cascade quartz photonic crystal fiber of the present invention adopts stacking to prepare preform, and once draw shaping on fiber drawing tower by two-stage optical fiber and middle tapering.Namely the optical fiber the last period pulled out is prime optical fiber, and latter one section is rear class optical fiber, excessive with conical fiber between two-stage optical fiber, there is not solder joint.
The preparation method of preform of the present invention is: the capillary rod and the capillary that solid quartz pushrod and hollow quartz ampoule are drawn into external diameter 1mm, these pipe rods are carried out macroscopic alignment according to the microstructure of optical fiber and carry out presintering making them firmly combine in a mold, becomes preform.
Of the present inventionly once draw shaping process, need in fiber draw process, utilize air pump to control the gas pressure intensity of airport in prefabricated rods, and the tension force that optical fiber bears is monitored.Utilize tension measuring device on optical fiber to monitor in real time, according to the difference of optical fiber structure parameter, to wire-drawing temperature, drawing speed is gentle compresses into Row sum-equal matrix.The pulling process of optical fiber meets such equation:
Wherein r and R represents the radius of optical fiber and prefabricated rods cross section respectively.P represents pressure, and б presentation surface tension force, R represents the diameter of airport in prefabricated rods, S
f, S
prepresent the feeding speed of optical fiber traction and prefabricated rods on wire-drawer-tower respectively.After completing first order drawing optical fibers, increase the air pressure in prefabricated rods rapidly and improve drawing speed, to be transitioned into second level optical fiber with shorter tapering.Which reduce the Butt-coupling loss between two-stage optical fiber.According to mechanical equation, the pulling process of optical fiber meets following equation:
Wherein l is the length of transition between prefabricated rods and optical fiber.η is viscosity.Can be known by equation, if the gathering speed of optical fiber increases, affect the tension force in optical fiber logarithmic relationship can be become.So according to scheme provided by the invention, between front stage, the drawing velocity of optical fiber needs the raising of 4 to 5 times, and optical fiber also can not disconnect, make wire drawing failure.Fig. 4 give a kind of meet above-mentioned feature can be used in visible light wave range broad band laser produce the dispersion of cascade silica fiber front and back stages.Fig. 5 gives the dispersion curve provided according to Fig. 4, by the 1064nm pulse of incident 4ps pulsewidth 25kW peak power at fiber end face, and the prime spectrum widening figure that simulation obtains.As seen from the figure, the spectral energy being greater than 70% has concentrated between 550-700nm.
After Fig. 6 gives the spectrum of the injection prime optical fiber generation that simulation obtains, the visible-range spectrum produced in rear class optical fiber.Its 20dB bandwidth can cover 400 to 800nm visible light wave range.
Prime structural parameters Λ=2.37 μm of cascaded optical fiber, d/ Λ=0.4.Rear class optical fiber structure parameter is Λ=0.9 μm, d/ Λ=0.91.
Solid quartz pushrod and hollow quartz ampoule are drawn into capillary rod and the capillary of external diameter 1mm by fiber drawing tower.These pipe rods are carried out macroscopic alignment according to the microstructure of optical fiber and carry out presintering in metal die, makes them firmly combine, become preform.The air pressure controlling to pump into prefabricated rods is 2 to 5kPa.Maintain the feeding speed constant 0.2 of wire-drawer-tower to 0.4mm/min, adjustment drawing speed is between 10-20cm/min, and the external diameter of Real-Time Monitoring drawing optical fiber, makes the size that the prime optical fiber tool of drawing optical fiber and design is same.Raise temperature of smelting furnace, when tension force in the optical fiber recorded reduces, increases rapidly the air pressure that pumps into 6-10kPa, increase wire-drawer-tower pulls the speed to 0.7 of the roller of optical fiber to 1.4m/min, the photonic crystal fiber of the variable core diameter of acquisition cascade.
The cascade silica fiber of acquisition and light source are carried out welding coupling, obtains the cascade-connection photon crystal fiber laser that can export high-power visible spectrum.
Claims (2)
1. a cascade-connection photon crystal fiber laser, it is characterized in that by pumping source and no-welding-spot cascade quartz photonic crystal fiber in series, described pumping source be 1064nm mix ytterbium psec fiber laser, described no-welding-spot cascade quartz photonic crystal fiber is a kind of microstructured optical fibers based on quartz material and containing airport, this optical fiber has three stage structure in the direction of propagation of light: prime optical fiber, intermediate transition optical fiber and rear class optical fiber, described prime optical fiber has the core size of 2 ~ 4 microns, footpath-the gap ratio of airport is 0.3 ~ 0.5, described rear class optical fiber has the core diameter of the submicron order of 0.85 to 1 micron, footpath-the gap ratio of airport is 0.9 ~ 0.95, intermediate transition optical fiber is tapered.
2. cascade quartz photonic crystal fiber according to claim 1, it is characterized in that: the main body of described no-welding-spot cascade quartz photonic crystal fiber is the airport of equilateral triangle arrangement, background material is pure quartz glass, centered by wherein any one airport, six airports of its next-door neighbour become regular hexagon to arrange, and described airport has nine layers.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
| CN110445000A (en) * | 2019-06-30 | 2019-11-12 | 天津大学 | 1000-1100nm tunable wave length fs-laser system |
| EP3812807A1 (en) * | 2019-10-24 | 2021-04-28 | ASML Netherlands B.V. | Hollow-core photonic crystal fiber based optical component for broadband radiation generation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
| CN110445000A (en) * | 2019-06-30 | 2019-11-12 | 天津大学 | 1000-1100nm tunable wave length fs-laser system |
| EP3812807A1 (en) * | 2019-10-24 | 2021-04-28 | ASML Netherlands B.V. | Hollow-core photonic crystal fiber based optical component for broadband radiation generation |
| WO2021078690A1 (en) * | 2019-10-24 | 2021-04-29 | Asml Netherlands B.V. | Hollow-core photonic crystal fiber based optical component for broadband radiation generation |
| US11774671B2 (en) | 2019-10-24 | 2023-10-03 | Asml Netherlands B.V. | Hollow-core photonic crystal fiber based optical component for broadband radiation generation |
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