CN102820606A - Mid-infrared supercontinuum laser based on excitation of supercontinuum light source - Google Patents
Mid-infrared supercontinuum laser based on excitation of supercontinuum light source Download PDFInfo
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Abstract
The invention provides a mid-infrared supercontinuum laser based on the excitation of the supercontinuum light source, belonging to the technical field of laser photoelectron. The mid-infrared supercontinuum laser specially comprises a pulsed fiber laser, a quartz photonic crystal fiber and a chalcogenide glass fiber. The pulsed laser emitted by the pulsed fiber laser generates the supercontinuum laser with the wavelength ranging from 1,000nm to 2,300nm through the quartz photonic crystal fiber, wherein the supercontinuum laser serves as the excitation source to excite the chalcogenide glass fiber with a section of cone structure or photonic crystal fiber structure with air holes to generate and output the mid-infrared supercontinuum laser with the wavelength ranging from 2,000nm to 5,000nm. The invention provides the mid-infrared supercontinuum laser based on the excitation of the supercontinuum light source to solve the technical problems and realize the output of the mid-infrared supercontinuum laser with high power and high coupling efficiency.
Description
Technical field
The present invention relates to the laser optoelectronic technical field, relate in particular to a kind of middle infrared excess continuous spectrum fiber laser of super continuum source excitation.
Background technology
Usually be wavelength that the wave band of 3 ~ 25 μ m is defined as middle-infrared band, wherein the mid-infrared laser of 3 ~ 5 mu m wavebands is used more extensive.The method that can realize the output of 3 ~ 5 μ m laser at present mainly contains: optical parametric oscillator method, difference frequency generation, QCL and gas laser.Utilize the optical parametric oscillator method to realize the output of middle-infrared band laser, need to use ultra-short pulse laser pumping source and nonlinear crystalline material to realize that cost is higher; Utilize the difference frequency generation method can only realize lower powered middle-infrared band laser output, and conversion efficiency is low; Quantum cascade laser structure is simple relatively, and conversion efficiency is higher relatively, but wavelength is untunable; The infrared-gas laser has CO gas laser and CO in typical
2Gas laser, but the shortcoming of gas laser is bulky, uses inconvenient.
To the above several kinds of characteristics that realize the method for mid-infrared laser; Can utilize fiber laser to produce mid-infrared laser, the fiber laser volume is little, in light weight, conversion efficiency is high, easy to use flexibly, wavelength modulation range is big, can export the high-power laser of high light beam quality.Because the restriction of middle infrared material and doping process level; Rare earth ion doped ZBLAN fiber laser development commonly used at present is comparatively ripe; But be mostly small-power output, and laser output wavelength is less than 4 μ m, the application greater than 4 μ m is restricted for the wavelength demand.
Utilize at present binary chalcogenide glass material optical fiber produce in also report to some extent of infrared excess continuous spectrum laser; But its driving source adopts Raman fiber lasers more or mixes the fiber laser of thulium; But the power output of this middle infrared optical fiber super continuous spectrums laser basically all is the milliwatt magnitude; Power output is low, can not realize powerful middle infrared excess continuous spectrum laser output.
Therefore, need a urgent technical problem that solves to be exactly instantly: how can propose a kind of effective measures, with the low and low problem of coupling efficiency of power output that solves existing middle infrared excess continuous spectrum fiber laser.
Summary of the invention
The present invention provides a kind of middle infrared excess continuous spectrum fiber laser of super continuum source excitation; In order to the low and low problem of coupling efficiency of power output that solves existing middle infrared excess continuous spectrum fiber laser, realize the middle infrared excess continuous spectrum laser output of high power and high coupling efficiency.
In order to solve the problems of the technologies described above; The invention provides a kind of middle infrared excess continuous spectrum fiber laser of super continuum source excitation; Specifically comprise pulse optical fiber, quartzy photonic crystal fiber and chalcogenide glass fiber, wherein, the pulse laser that said pulse optical fiber sends; Producing wave-length coverage through quartzy photonic crystal fiber is the super continuous spectrums laser of 1000 ~ 2300nm; Said super continuous spectrums laser is as driving source, and excitation chalcogenide glass fiber, generation wavelength are the middle infrared excess continuous spectrum laser output of 2000 ~ 5000nm.
Further; The middle infrared excess continuous spectrum fiber laser of described super continuum source excitation also comprises amplifying stage, and the pulse laser that pulse optical fiber sends is the super continuous spectrums laser of 1000 ~ 2300nm through quartzy photonic crystal fiber generation wave-length coverage again after getting into amplifying stage.
Further, said pulse optical fiber is selected the pulse optical fiber of different cavity structures according to the wavelength of the super continuous spectrums of output and the requirement of power, and its cavity structure comprises F-P chamber, annular chamber and 8 letter lock mould annular chambers.
Further, the wavelength of the super continuous spectrums that said amplifying stage is exported as required and power are selected one or more levels structure for amplifying, and the gain fibre that is adopted comprises doubly clad optical fiber, the erbium ytterbium co doped double clad fiber of er-doped and mixes the doubly clad optical fiber of ytterbium.
Further, the wavelength of the said amplifying stage semiconductor laser driving source confirming according to the material of the gain fibre that self adopts self to adopt.
Further, the connected mode of said quartzy photonic crystal fiber and chalcogenide glass fiber is direct mechanical butt joint, direct welding or lens focus spatial coupling.
Further, when the zero-dispersion wavelength of said chalcogenide glass fiber material dispersion during smaller or equal to 2300nm, said chalcogenide glass fiber is common single covering monomode fiber.
Further, when the zero-dispersion wavelength of said chalcogenide glass fiber material dispersion during greater than 2300nm, said chalcogenide glass fiber is to be provided with the awl section length with the pyramidal structure of awl district core diameter or for having the photonic crystals optical fiber structure of airport.
Further; The middle infrared excess continuous spectrum fiber laser of described super continuum source excitation; Also comprise condenser lens; Said condenser lens focuses on super continuous spectrums laser and is coupled to the middle infrared excess continuous spectrum laser output that chalcogenide glass fiber generation wavelength is 2000 ~ 5000nm, and said condenser lens plating is to the anti-reflection film of 1000-2300nm wavelength laser.
To sum up; Use infrared excess continuous laser in the generation of ultra continuous laser source excitation chalcogenide glass fiber in the scheme of the present invention; Avoid the use of and to reach high-power Raman fiber lasers and expensive thulium-doped fiber laser, adopts common ytterbium, er-doped or the erbium-ytterbium co-doped fiber mixed to realize that as gain fibre high power laser light exports as driving source; Adopt three kinds of coupled modes to realize the coupling of quartzy photonic crystal fiber and chalcogenide glass fiber:; Quartzy photonic crystal fiber and chalcogenide glass fiber are if adopt direct mechanical butt joint coupled modes; Can reduce the welding difficulty; Technology is very simple; Quartzy photonic crystal fiber and chalcogenide glass fiber are if adopt the welding mode can realize all optical fibre structure, and be easy to use flexible, if one section fusing point matched fiber of welding can reduce splice loss, splice attenuation to a certain extent and improve coupling efficiency between quartzy photonic crystal fiber and chalcogenide glass fiber; Quartzy photonic crystal fiber and chalcogenide glass fiber can be realized the middle infrared excess continuous spectrum laser output of high coupling efficiency if adopt the lens space coupled modes.
Description of drawings
Fig. 1 is the structural representation of middle infrared excess continuous spectrum fiber laser of a kind of super continuum source excitation of embodiments of the invention 1;
Fig. 2 is the structural representation of middle infrared excess continuous spectrum fiber laser of a kind of super continuum source excitation of embodiments of the invention 2;
Fig. 3 is the pyramidal structure sketch map of the chalcogenide glass fiber described in the embodiment of the present invention;
Fig. 4 is the photonic crystals optical fiber structure sketch map that has airport of the chalcogenide glass fiber described in the embodiment of the present invention.
Embodiment
Because chalcogenide glass has high index of refraction, high non-linearity characteristic; And have than long IR-cut wavelength (> 12 μ m thoroughly) and lower phonon energy; Therefore the embodiment of the invention is used for chalcogenide glass fiber in the infrared excess continuous spectrum fiber laser, to realize more high power and more the laser output of 3 ~ 5 mum wavelengths of high coupling efficiency.Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
Embodiment 1:
As shown in Figure 1, a kind of middle infrared excess continuous spectrum optical-fiber laser implement body of super continuum source excitation comprises pulse optical fiber 1, quartzy photonic crystal fiber 3 and chalcogenide glass fiber 4.
In the present embodiment; The laser of certain repetition rate that pulse optical fiber 1 sends, wavelength, pulsewidth; Through quartzy photonic crystal fiber 3, produce near the super continuous spectrums output of wave-length coverage near-infrared, super continuous spectrums produces the longer super continuous spectrums output of wavelength through chalcogenide glass fiber 4.
In the present embodiment, quartzy photonic crystal fiber 3 can adopt direct mechanical to dock or directly welding with chalcogenide glass fiber 4.
More concrete, for this connected mode of direct welding, can quartzy photonic crystal fiber 3 and chalcogenide glass fiber 4 between one section fusing point matched fiber of welding, to reduce the fusing point loss and to improve coupling efficiency.
Preferably, when the zero-dispersion wavelength of the material dispersion of chalcogenide glass fiber 4 during smaller or equal to 2300nm, chalcogenide glass fiber 4 is common single covering monomode fiber; And when the zero-dispersion wavelength of chalcogenide glass fiber 4 material dispersions during greater than 2300nm, the structure of chalcogenide glass fiber 4 is the pyramidal structure that is provided with awl section length and awl district core diameter as shown in Figure 3 or is the photonic crystals optical fiber structure that is provided with airport as shown in Figure 4.
More concrete; The super continuous spectrums Wavelength of Laser scope that quartzy photonic crystal fiber 3 produces is 1000 ~ 2300nm; Also promptly: near the wave-length coverage of the super continuous spectrums of this programme medium wavelength scope near-infrared is 1000 ~ 2300nm, and the wavelength of the super continuous spectrums that wavelength is longer is 2000 ~ 5000nm.
Embodiment 2:
As shown in Figure 2, a kind of middle infrared excess continuous spectrum fiber laser of super continuum source excitation comprises pulse optical fiber 1, amplifying stage 2, quartzy photonic crystal fiber 3, chalcogenide glass fiber 4 and condenser lens 6 compositions.
In the present embodiment; The laser of certain repetition rate that pulse optical fiber 1 sends, wavelength, pulsewidth obtains amplifying through amplifying stage 2 power; Power is through the quartzy photonic crystal fiber 3 of laser process after amplifying; Produce near the super continuous spectrums output of wave-length coverage near-infrared, super continuous spectrums laser focuses on through condenser lens 6 and is coupled to the longer super continuous spectrums output of chalcogenide glass fiber 4 generation wavelength.
Preferably, when the zero-dispersion wavelength of the material dispersion of chalcogenide glass fiber 4 during smaller or equal to 2300nm, chalcogenide glass fiber 4 is common single covering monomode fiber; And when the zero-dispersion wavelength of chalcogenide glass fiber 4 material dispersions during greater than 2300nm, the structure of chalcogenide glass fiber 4 is awl section length and the pyramidal structure of awl district core diameter and the photonic crystals optical fiber structure as shown in Figure 4 of being provided with as shown in Figure 3.
Supplementary notes, in the accompanying drawing, 1, pulse optical fiber, 2, amplifying stage, 3, quartzy photonic crystal fiber, 4, chalcogenide glass fiber, 5, output laser, 6, condenser lens.
In this programme, pulse optical fiber 1 is selected the pulse optical fiber of different cavity structures according to the wavelength of the super continuous spectrums of output and the requirement of power, and its cavity structure comprises F-P chamber, annular chamber and 8 letter lock mould annular chambers.
Simultaneously, the wavelength and the power of the super continuous spectrums that amplifying stage 2 is exported are as required selected one or more levels structure for amplifying, and the gain fibre that is adopted comprises doubly clad optical fiber, the erbium ytterbium co doped double clad fiber of er-doped and mixes the doubly clad optical fiber of ytterbium.
Concrete, amplifying stage 2 is different according to the gain fibre that self adopts, and amplifying stage is also different according to the semiconductor laser driving source wavelength that self adopts.
Wherein, the connected mode of quartzy photonic crystal fiber 3 and chalcogenide glass fiber 4 is direct welding or spatial coupling.More concrete, said chalcogenide glass fiber 4 is distinguished the pyramidal structure of core diameter or is the photonic crystals optical fiber structure that is provided with airport as shown in Figure 4 with awl for being provided with the awl section length.
Simultaneously, condenser lens 6 can plate the anti-reflection film of 1000-2300nm wavelength laser to improve coupling efficiency.
The middle infrared excess continuous spectrum fiber laser of super continuum source provided by the invention excitation and utilize MOPA structured optical fiber laser (pulse optical fiber 1 and amplifying stage 2) and quartzy photonic crystal fiber can realize the high-power near infrared band super continuous spectrums laser of generation at present utilizes this high power super continuous spectrums laser to encourage chalcogenide glass fiber can realize the super continuous spectrums laser of the middle-infrared band of high power (tens watts) as driving source.In addition, the coupling efficiency of middle infrared excess continuous spectrum fiber laser that has adopted condenser lens in the light path provided by the invention has very big practicality far above the coupling efficiency of infrared excess continuous spectrum fiber laser in the existing full optical fiber.
More than the middle infrared excess continuous spectrum fiber laser of super continuum source provided by the present invention excitation has been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation; It is characterized in that; Comprise pulse optical fiber, quartzy photonic crystal fiber and chalcogenide glass fiber, wherein, the pulse laser that said pulse optical fiber sends; Producing wave-length coverage through quartzy photonic crystal fiber is the super continuous spectrums laser of 1000 ~ 2300nm; Said super continuous spectrums laser is as driving source, and excitation chalcogenide glass fiber, generation wavelength are the middle infrared excess continuous spectrum laser output of 2000 ~ 5000nm.
2. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that; Also comprise amplifying stage, the pulse laser that pulse optical fiber sends is the super continuous spectrums laser of 1000 ~ 2300nm through quartzy photonic crystal fiber generation wave-length coverage again after getting into amplifying stage.
3. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that; Said pulse optical fiber is according to the wavelength of the super continuous spectrums of output and the requirement of power; Select the pulse optical fiber of different cavity structures, its cavity structure comprises F-P chamber, annular chamber and 8 letter lock mould annular chambers.
4. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 2; It is characterized in that; The wavelength of the super continuous spectrums that said amplifying stage is exported as required and power; Select one or more levels structure for amplifying, the gain fibre that is adopted comprises doubly clad optical fiber, the erbium ytterbium co doped double clad fiber of er-doped and mixes the doubly clad optical fiber of ytterbium.
5. the middle infrared excess continuous spectrum fiber laser of super continuum source according to claim 4 excitation is characterized in that, the wavelength of the semiconductor laser driving source that said amplifying stage is confirmed according to the material of the gain fibre that self adopts self to adopt.
6. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that the connected mode of said quartzy photonic crystal fiber and chalcogenide glass fiber is direct mechanical butt joint, direct welding or lens focus spatial coupling.
7. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that; When the zero-dispersion wavelength of said chalcogenide glass fiber material dispersion during smaller or equal to 2300nm, said chalcogenide glass fiber is common single covering monomode fiber.
8. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that; When the zero-dispersion wavelength of said chalcogenide glass fiber material dispersion during greater than 2300nm, said chalcogenide glass fiber is to be provided with the awl section length with the pyramidal structure of awl district core diameter or for having the photonic crystals optical fiber structure of airport.
9. the middle infrared excess continuous spectrum fiber laser of super continuum source excitation according to claim 1; It is characterized in that; Also comprise condenser lens; Said condenser lens focuses on super continuous spectrums laser and is coupled to the middle infrared excess continuous spectrum laser output that chalcogenide glass fiber generation wavelength is 2000 ~ 5000nm, and said condenser lens plating is to the anti-reflection film of 1000-2300nm wavelength laser.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151687A (en) * | 2013-03-10 | 2013-06-12 | 中国人民解放军国防科学技术大学 | Method for directly generating intermediate infrared super-continuum spectrum in amplifier |
| CN104009376A (en) * | 2014-05-06 | 2014-08-27 | 北京工业大学 | Mid-infrared super-continuum spectrum light source for Cr:II-VI-family crystal laser pumping |
| CN104201545A (en) * | 2014-08-06 | 2014-12-10 | 深圳大学 | Ultra-wideband supercontinuum source based on two-waveband fiber optic laser |
| CN105071205A (en) * | 2015-07-30 | 2015-11-18 | 复旦大学 | Supercontinuum light source based on mode-locked fiber laser with adjustable pulse width |
| CN103337779B (en) * | 2013-07-05 | 2016-04-06 | 中国人民解放军国防科学技术大学 | The middle infrared-gas laser of pumped fiber |
| CN105790052A (en) * | 2016-03-24 | 2016-07-20 | 中国人民解放军国防科学技术大学 | Method of improving mid-infrared supercontinuum light source slope efficiency and output power |
| CN105826800A (en) * | 2016-04-21 | 2016-08-03 | 宁波大学 | All-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source |
| CN105977775A (en) * | 2016-07-18 | 2016-09-28 | 电子科技大学 | Cascade gain modulation dual-wavelength medium-infrared pulse optical fiber laser device |
| CN106848809A (en) * | 2017-03-06 | 2017-06-13 | 李志远 | A kind of generation is visible to infrared band pole broadband, the device of super continuous laser |
| CN111370982A (en) * | 2020-03-16 | 2020-07-03 | 宁波大学 | Chalcogenide optical fiber coupler for generating mid-infrared super-continuum spectrum |
| CN111711062A (en) * | 2020-06-09 | 2020-09-25 | 南京大学 | Method and device for generating intermediate infrared optical frequency comb |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151687A (en) * | 2013-03-10 | 2013-06-12 | 中国人民解放军国防科学技术大学 | Method for directly generating intermediate infrared super-continuum spectrum in amplifier |
| CN103151687B (en) * | 2013-03-10 | 2015-08-19 | 中国人民解放军国防科学技术大学 | A kind of directly produce in the amplifier in the method for infrared excess continuous spectrum |
| CN103337779B (en) * | 2013-07-05 | 2016-04-06 | 中国人民解放军国防科学技术大学 | The middle infrared-gas laser of pumped fiber |
| CN104009376A (en) * | 2014-05-06 | 2014-08-27 | 北京工业大学 | Mid-infrared super-continuum spectrum light source for Cr:II-VI-family crystal laser pumping |
| CN104201545A (en) * | 2014-08-06 | 2014-12-10 | 深圳大学 | Ultra-wideband supercontinuum source based on two-waveband fiber optic laser |
| WO2016019746A1 (en) * | 2014-08-06 | 2016-02-11 | 深圳大学 | Ultra-wideband supercontinuum light source based on two-waveband fibre laser |
| CN105071205A (en) * | 2015-07-30 | 2015-11-18 | 复旦大学 | Supercontinuum light source based on mode-locked fiber laser with adjustable pulse width |
| CN105790052A (en) * | 2016-03-24 | 2016-07-20 | 中国人民解放军国防科学技术大学 | Method of improving mid-infrared supercontinuum light source slope efficiency and output power |
| CN105826800A (en) * | 2016-04-21 | 2016-08-03 | 宁波大学 | All-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source |
| CN105826800B (en) * | 2016-04-21 | 2020-06-16 | 宁波大学 | All-fiber broadband flat mid-infrared super-continuum spectrum light source |
| CN105977775A (en) * | 2016-07-18 | 2016-09-28 | 电子科技大学 | Cascade gain modulation dual-wavelength medium-infrared pulse optical fiber laser device |
| CN105977775B (en) * | 2016-07-18 | 2019-02-19 | 电子科技大学 | Cascaded gain modulates infrared pulse optical fiber laser in dual wavelength |
| CN106848809A (en) * | 2017-03-06 | 2017-06-13 | 李志远 | A kind of generation is visible to infrared band pole broadband, the device of super continuous laser |
| CN111370982A (en) * | 2020-03-16 | 2020-07-03 | 宁波大学 | Chalcogenide optical fiber coupler for generating mid-infrared super-continuum spectrum |
| CN111370982B (en) * | 2020-03-16 | 2021-06-15 | 宁波大学 | Chalcogenide optical fiber coupler for generating mid-infrared super-continuum spectrum |
| CN111711062A (en) * | 2020-06-09 | 2020-09-25 | 南京大学 | Method and device for generating intermediate infrared optical frequency comb |
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