CN101329490B - High power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber - Google Patents
High power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber Download PDFInfo
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- CN101329490B CN101329490B CN2008100536282A CN200810053628A CN101329490B CN 101329490 B CN101329490 B CN 101329490B CN 2008100536282 A CN2008100536282 A CN 2008100536282A CN 200810053628 A CN200810053628 A CN 200810053628A CN 101329490 B CN101329490 B CN 101329490B
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Abstract
The invention discloses a high power frequency converter of small core diameter beaming high non-linear photonic crystal fiber, which belongs to a high power ultra continual Laser Technology in the laser field. The converter is composed of a single high power pulse laser, a non-spherical surface collimation beam expander or micro-lens array, the small core diameter beaming high non-linear photonic crystal fiber, a non-spherical surface focusing lens or micro-lens array and big model field photonic crystal fiber. Or the converter is composed of the single high power pulse laser, the non-spherical surface collimation beam expander or micro-lens array, the small core diameter beaming high non-linear photonic crystal fiber and the big model field photonic crystal fiber. The converter of the invention has the advantages of having the ultra continual laser output capacity of above dozens of watt.
Description
Technical field
The present invention relates to a kind of high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber, belong to the super continuous laser source technology of high power in the laser field.
Background technology
Super continuous laser source (white light laser) is the very wide LASER Light Source of a kind of spectral distribution, and consequent spectrally resolved technology has obtained in fields such as optical communication, life science, military affairs using widely.The core in super continuous laser source is frequency transformation, is about to ultrashort pulse realizes spectrum by nonlinear medium broadening.The material that is used for the conversion of super continuous laser source frequency mainly contains three kinds: liquid flux, lump-shaped media and optical fiber [1].The former people's the visual field because the inconvenience of fluent material in practicality faded out gradually; The action length of lump-shaped media (white stone, glass etc.) is short, and conversion efficiency is lower, and the thermal effect influence is big, general reference light source in OPO or time resolution; Optical fiber is divided into two classes again, a kind of is common dispersion shifted optical fiber, another kind of is photonic crystal fiber, because the latter has higher high non-linearity (the little core diameter of about 2 μ m) so conversion efficiency is higher than the former, spectrum widening is big and smooth, and the zero dispersion point design is convenient, becomes the research focus [2-4] of super continuous white light source at present thus.
Yet the photonic crystal fiber that adopts single little core diameter carries out frequency transformation and has significant disadvantages, and the little core diameter (small size) that is exactly optical fiber can not bear higher incident laser power, therefore makes the output power in super continuous laser source lower.So just caused a pair of contradiction, i.e. frequency transformation needs high non-linearity, i.e. the little core diameter of optical fiber, and bearing high incident power (being high-output power) then needs big optical fiber core diameter.
List of references
[1] R.R.Alfano edits, " super continuous laser source ", Springer-Verlag publishing house, 1989 years versions.
[2] M.Yamashita, H.Shigekawa, R.Morita edit " monocycle photonics and optical scanning tunnel microtechnic ", Springer-Verlag publishing house, version in 2005.
[3] Hu Minglie, Wang Qingyue, Li Yanfeng, the king is special, Zhang Zhigang, bavin road, Zhang Ruobing, " femtosecond laser produces super continuum light spectrum experimental Study on Mechanism in photonic crystal fiber ", " Acta Physica Sinica ", the 53rd volume, the 12nd phase (2004), page or leaf: 4243-4247.
[4] G.Genty, S.Coen, J.M.Dudley, " the super continuous source of optical fiber (specially inviting) ", the magazine B of Optical Society of America,, the 24th volume, 1771-1785 page or leaf in 2007.
Summary of the invention
The present invention is intended to propose a kind of high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber.This high power frequency changer has the ability of the super continuous laser output more than tens watts.
The present invention is realized by the following technical programs, a kind of high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber, it is characterized in that, this device is by separate unit high power large mode area pcf mode-locked laser or separate unit high power solid pulse laser or separate unit high power semiconductor pulsed laser 1, aspheric surface collimator and extender device or micro lens array I 2, small core radial bundling type high non-linear photon crystal optical fiber 3, aspheric surface condenser lens or micro lens array II 4 and large mode area pcf 5 constitute, the annexation of each parts is in the device, the laser of laser instrument output is by aspheric surface collimator and extender device or micro lens array I, behind beam-expanding collimation shaping or micro lens array, be coupled into small core radial bundling type high non-linear photon crystal optical fiber, then in each little core diameter, carry out frequency transformation simultaneously, produce the super continuous laser of multi beam, through aspheric surface condenser lens or micro lens array II the super continuous laser of multi beam is coupled into large mode area pcf again, and the high-power super continuous laser output of Shu Chengwei.
Two of technical scheme of the present invention is, a kind of high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber, it is characterized in that, this device is by separate unit high power large mode area pcf mode-locked laser or separate unit high power solid pulse laser or separate unit semiconductor pulse laser 1, aspheric surface collimator and extender device or micro lens array I 2, small core radial bundling type high non-linear photon crystal optical fiber 3 and large mode area pcf 5 constitute, the annexation of each parts is in the device, the laser of laser instrument output is by aspheric surface collimator and extender device or micro lens array I 2, behind beam-expanding collimation shaping or micro lens array, be coupled into small core radial bundling type high non-linear photon crystal optical fiber, then in each little core diameter, carry out frequency transformation in the optical fiber simultaneously, produce the super continuous laser of multi beam, the long-pending effective mode field area with the small core radial bundling type photonic crystal fiber of the die face of the large mode area pcf of selecting is suitable, small core radial bundling type photonic crystal fiber and large mode area pcf directly are coupled with the welding of subsiding, the high-power super continuous laser output of super continuous laser of multi beam and Shu Chengwei.
Above-mentioned high power large mode area pcf mode-locked laser is made of the polarization faraday isolator between oscillator stage and amplifier stage and oscillator stage and the amplifier stage, oscillator stage covers the photonic crystal gain fibre by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field, semiconductor saturable absorbing mirror and polarization rotation (NPE) mix mode locker, oscillator stage grating pair or big negative dispersion optical fiber dispersion compensator constitute, wherein, the core diameter of photonic crystal gain fibre is the 10-50 micron, numerical aperture (NA) is 0.02-0.06, surrounding layer diameter 200-400 micron, numerical aperture (NA) is 0.4-0.8, and length is 1-10m; Cladding pumping is the high-power laser diode of 5-30W, amplifier stage covers photonic crystal gain fibre, amplifier stage grating pair or big negative dispersion optical fiber dispersion compensator by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field and constitutes, wherein, the core diameter of photonic crystal gain fibre is the 20-70 micron, numerical aperture (NA) is 0.02-0.06, surrounding layer diameter 200-400 micron, and numerical aperture (NA) is 0.4-0.8, length is 1-10m, and cladding pumping is the 20-100W high-power laser diode.
Above-mentioned aspheric surface collimator and extender device is the Galileo telescope system, and expanding beam ratio is with respect to 1 of the effective mode field diameter of small core radial bundling type photonic crystal fiber: 2-10; The micro lens array focal length is the millimeter magnitude.
Above-mentioned small core radial bundling type high non-linear photon crystal optical fiber, effective mould field of this optical fiber are that 1-2 micron fiber boundling constitutes by a plurality of core diameters, have little airport to constitute covering around each little fibre core, and wherein: the diameter of little airport is D
1, 0＜D
1＜core diameter; The centre distance of two adjacent little airports is Λ
1, value satisfies D
1/ Λ
1=0.3-0.8; The little core of boundling periphery is the big airport cladding structure of multilayer, and wherein: the diameter of big airport is D
2, core diameter＜D
2＜Λ
2The centre distance of two adjacent big airports is Λ
2, value satisfies D
2/ Λ
2=0.8-0.95.
Above-mentioned aspheric surface condenser lens is that focal length is the microcobjective of 5-20mm, and the micro lens array focal length is the millimeter magnitude.
Above-mentioned large mode area pcf is that core diameter is the photonic crystal fiber of 30-100 micron.
The invention has the advantages that: (1) adopts the small core radial bundling type photonic crystal fiber to improve the nonlinear factor of optical fiber as the frequency transformation device, and therefore the fiber lengths that uses can reduce.(2) this by the integrated novel high non-linear photon crystal optical fiber of a plurality of little core diameters in original high non-linearity that kept (raising), had bigger effective mode field area again, therefore this photonic crystal fiber can bear bigger pump energy, promptly can be used for high power frequency conversion laser and produces.(3) adopt micro-optic non-spherical lens array to carry out and restraint the coupling efficiency height.(4) adopt the large mode area pcf that is complementary with the effective mode field area of the many small core radial bundling type high non-linear photon crystal optical fibers welding coupling of directly subsiding more simple and easy to do.(5) this many small core radial bundling type high non-linear photon crystal optical fibers are combined with high power light photonic crystal fiber mode-locked laser, can constitute miniaturization, high-power frequency changer.
Description of drawings
Fig. 1 is the structured flowchart of the high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber of the present invention.
Among the figure: 1 is high power pulsed laser; 2 is aspheric surface collimator and extender device or micro lens array I; 3 is small core radial bundling type high non-linear photon crystal optical fiber; 4 is aspheric surface condenser lens or micro lens array II; 5 is large mode area pcf.
Fig. 2 is the structural representation of small core radial bundling type high non-linear photon crystal optical fiber 3 among Fig. 1.
Among the figure: 3-1 is little core diameter fibre core; 3-2 is a little airport covering interior around the little fibre core; 3-3 is the big airport inner cladding around the little fibre core of boundling; 3-4 is an optical fiber jacket.
Fig. 3 is the structural representation of the high power large mode area pcf lock laser instrument that high power pulsed laser adopts among Fig. 1.
Among the figure: 1-1 is the oscillator stage pumping source; 1-2 is an oscillator stage large mould field photon crystal gain fibre; 1-3 is that semiconductor saturable absorbing mirror and polarization rotation (NPE) mix mode locker; 1-4 is oscillator stage grating pair or big negative dispersion optical fiber dispersion compensator; 1-5 is the polarization faraday isolator; 1-6 is an amplifier stage large mould field photon crystal gain fibre; 1-7 is amplifier stage grating pair or big negative dispersion optical fiber dispersion compensator; 1-8 is an amplifier stage level pumping source.
Embodiment
The high power frequency changer of small core radial bundling type high non-linear photon crystal optical fiber of the present invention as shown in Figure 1, specific embodiment is as follows:
High power pulsed laser adopts high power large mode area pcf lock laser instrument shown in Figure 3, the gain media of oscillator stage wherein adopts the big mould field double-contracting of mixing Yb to cover polarization-maintaining photonic crystal fiber 1-2,25 microns of core diameters, NA is 0.03, and 250 microns of surrounding layer diameters, NA are 0.5, length is 3.5m, cladding pumping is directly carried out through subsiding and polishing the oblique angle in two ends, or the SMF of welding 10cm, by the pumping of WDM mode; Oscillator stage adopts the LD of 10W to carry out single or double cladding pumping form, one end of resonator cavity is taked semiconductor saturable absorbing mirror and polarization impeller locked mode 1-3 and as output port, adopts grating pair or big negative dispersion optical fiber dispersion compensator 1-4 to carry out dispersion compensation and pulse compression at the other end of resonator cavity; The gain media of amplifier stage adopts the big mould field double-contracting of mixing Yb to cover polarization-maintaining photonic crystal fiber 1-6,40 microns of core diameters, NA is 0.03,270 microns of surrounding layer diameters, NA is 0.6, and length is 1.5m, and cladding pumping is directly carried out through subsiding and polishing the oblique angle in two ends, or weld the SMF that goes up suitable length, by the pumping of WDM mode; Adopt the LD of high power 30W to carry out single or double cladding pumping form, place polarization faraday isolator 1-5 at the input end of this resonator cavity and return oscillator stage, carry out dispersion compensation and pulse compression at the output terminal employing grating pair or the big negative dispersion optical fiber dispersion compensator 1-7 of resonator cavity to prevent laser; High power pulsed laser also can be any other high power pulsed laser.It is 1 that aspheric surface collimator and extender device select for use non-spherical lens to constitute to expand beam ratio: the Galileo telescope system of 2-10; Perhaps adopt micro lens array that the output of high power pulsed laser is directly focused in each fibre core of small core radial bundling type high non-linear photon crystal optical fiber.Small core radial bundling type high non-linear photon crystal optical fiber as shown in Figure 2.It is to be that 2 microns little fibre core compiles and forms by 7 (or more than) core diameters, surrounds the little airport of one deck around each little core, and two adjacent little airport hole centre distance are Λ
1, the diameter of little airport is D
1Surround the big airport of multilayer again around the little core of whole boundling, two adjacent big airport hole centre distance are Λ
2, the diameter of big airport is D
2The position that interval by regulating the surrounding air hole and diameter just can be adjusted the zero dispersion point is to adapt to the needs of different-waveband laser instrument; As concrete data 1: for quartz material, zero chromatic dispersion is at the 800nm wave band, and 7 core boundlings are desirable: inner cladding airport parameter: Λ
1=2.0 μ m, D
1=1.6 μ m, surrounding layer airport parameter: Λ
2=4.5 μ m, D
2=3.90 μ m constitute that effective die face is long-pending to be: 58.22 μ m
2Concrete data 2: for quartz material, zero chromatic dispersion is at the 1550nm wave band, and 7 core boundlings are desirable: inner cladding airport parameter: Λ
1=2.0 μ m, D
1=1.32 μ m, surrounding layer airport parameter: Λ
2=4.5 μ m, D
2=3.90 μ m constitute that effective die face is long-pending to be: 3341 μ m
2The desirable 1-10m of above-mentioned fiber lengths.Aspheric surface condenser lens or micro lens array II4 are that focal length is the microcobjective of the non-spherical lens formation of 10-20mm, perhaps adopt the corresponding micro lens array of fibre core of small core radial bundling type high non-linear photon crystal optical fiber 3.Large mode area pcf 5, the long-pending large effective module scene with many small core radial bundling type high non-linear photon crystal optical fibers of its die face is quite long-pending, and length is 0.5-1m.
Two of technical scheme of the present invention, the high power pulsed laser 1 that is adopted, aspheric surface collimator and extender device or micro lens array I2, small core radial bundling type high non-linear photon crystal optical fiber 3 and large mode area pcf 5, all identical with one of technique scheme, different is, when the long-pending effective mode field area with the small core radial bundling type photonic crystal fiber of the die face of the large mode area pcf of selecting is suitable, the employing fusion techniques of subsiding directly is coupled small core radial bundling type high non-linear photon crystal optical fiber 3 and large mode area pcf 5, the two is not coupled by aspheric surface condenser lens or micro lens array II4 at needs.
Claims (4)
1. the high power frequency changer of a small core radial bundling type high non-linear photon crystal optical fiber, it is characterized in that, this device is by separate unit high power large mode area pcf mode-locked laser or separate unit high power solid pulse laser or separate unit high power semiconductor pulsed laser (1), aspheric surface collimator and extender device or micro lens array I (2), small core radial bundling type high non-linear photon crystal optical fiber (3), aspheric surface condenser lens or micro lens array II (4) and large mode area pcf (5) constitute, and described large mode area pcf is meant the core diameter size that can the keep single mode transport photonic crystal fiber at the 30-100 micrometer range; Described high power large mode area pcf mode-locked laser is made of the polarization faraday isolator between oscillator stage and amplifier stage and oscillator stage and the amplifier stage, oscillator stage covers the photonic crystal gain fibre by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field, semiconductor saturable absorbing mirror and polarization rotation mix mode locker, the oscillator stage grating pair constitutes, wherein, the core diameter of photonic crystal gain fibre is the 10-50 micron, numerical aperture is 0.02-0.06, surrounding layer diameter 200-400 micron, numerical aperture is 0.4-0.8, length is 1-10m, and cladding pumping is the high-power laser diode of 5-30W; Amplifier stage by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field cover the photonic crystal gain fibre, the amplifier stage grating pair constitutes, wherein, the core diameter of photonic crystal gain fibre is the 20-70 micron, numerical aperture is 0.02-0.06, surrounding layer diameter 200-400 micron, numerical aperture is 0.4-0.8, and length is 1-10m, and cladding pumping is the 20-100W high-power laser diode; Effective mould field of described small core radial bundling type high non-linear photon crystal optical fiber is that 1-2 micron fiber boundling constitutes by a plurality of core diameters, has little airport to constitute covering around each little fibre core, and wherein, the diameter of little airport is D
1, 0＜D
1＜core diameter, the centre distance of two adjacent little airports is Λ
1, value satisfies D
1/ Λ
1=0.3-0.8, the little core of boundling periphery is the big airport cladding structure of multilayer, wherein, the diameter of big airport is D
2, core diameter＜D
2＜Λ
2, the centre distance of two adjacent big airports is Λ
2, value satisfies D
2/ Λ
2=0.8-0.95; The annexation of each parts is in this device, the laser of laser instrument (1) output is by aspheric surface collimator and extender device or micro lens array I (2), behind beam-expanding collimation shaping or micro lens array, be coupled into small core radial bundling type high non-linear photon crystal optical fiber (3), then in each little core diameter, carry out frequency transformation simultaneously, produce the super continuous laser of multi beam, pass through the aspheric surface condenser lens again or micro lens array II (4) is coupled into large mode area pcf (5) with the super continuous laser of multi beam, and the high-power super continuous laser output of Shu Chengwei.
2. the high power frequency changer of a small core radial bundling type high non-linear photon crystal optical fiber, it is characterized in that, this device is by separate unit high power large mode area pcf mode-locked laser or separate unit high power solid pulse laser or separate unit semiconductor pulse laser (1), aspheric surface collimator and extender device or micro lens array I (2), small core radial bundling type high non-linear photon crystal optical fiber (3) and large mode area pcf (5) constitute, and described large mode area pcf is meant the core diameter size that can the keep single mode transport photonic crystal fiber at the 30-100 micrometer range; Described high power large mode area pcf mode-locked laser is made of the polarization faraday isolator between oscillator stage and amplifier stage and oscillator stage and the amplifier stage, oscillator stage covers the photonic crystal gain fibre by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field, semiconductor saturable absorbing mirror and polarization rotation mix mode locker, the oscillator stage grating pair constitutes, wherein, the core diameter of photonic crystal gain fibre is the 10-50 micron, numerical aperture is 0.02-0.06, surrounding layer diameter 200-400 micron, numerical aperture is 0.4-0.8, length is 1-10m, and cladding pumping is the high-power laser diode of 5-30W; Amplifier stage by the double-contracting of mixing ytterbium ion or er-doped ion of big mould field cover the photonic crystal gain fibre, the amplifier stage grating pair constitutes, wherein, the core diameter of photonic crystal gain fibre is the 20-70 micron, numerical aperture is 0.02-0.06, surrounding layer diameter 200-400 micron, numerical aperture is 0.4-0.8, and length is 1-10m, and cladding pumping is the 20-100W high-power laser diode; Effective mould field of described small core radial bundling type high non-linear photon crystal optical fiber is that 1-2 micron fiber boundling constitutes by a plurality of core diameters, has little airport to constitute covering around each little fibre core, and wherein, the diameter of little airport is D
1, 0＜D
1＜core diameter, the centre distance of two adjacent little airports is Λ
1, value satisfies D
1/ Λ
1=0.3-0.8, the little core of boundling periphery is the big airport cladding structure of multilayer, wherein, the diameter of big airport is D
2, core diameter＜D
2＜Λ
2, the centre distance of two adjacent big airports is Λ
2, value satisfies D
2/ Λ
2=0.8-0.95; The annexation of each parts is in this device, the laser of laser instrument (1) output is by aspheric surface collimator and extender device or micro lens array I (2), behind beam-expanding collimation shaping or micro lens array, be coupled into small core radial bundling type high non-linear photon crystal optical fiber (3), then in each little core diameter, carry out frequency transformation simultaneously, produce the super continuous laser of multi beam, the long-pending effective mode field area with the small core radial bundling type photonic crystal fiber of the die face of the large mode area pcf of selecting is suitable, small core radial bundling type photonic crystal fiber and large mode area pcf (5) directly are coupled with the welding of subsiding, the high-power super continuous laser output of super continuous laser of multi beam and Shu Chengwei.
3. press the high power frequency changer of claim 1 or 2 described small core radial bundling type high non-linear photon crystal optical fibers, it is characterized in that, aspheric surface collimator and extender device is the Galileo telescope system, and expanding beam ratio is with respect to 1 of the effective mode field diameter of small core radial bundling type photonic crystal fiber: 2-10; The micro lens array focal length is the millimeter magnitude.
4. by the high power frequency changer of the described small core radial bundling type high non-linear photon crystal optical fiber of claim 1, it is characterized in that the aspheric surface condenser lens is that focal length is the microcobjective of 5-20mm; The micro lens array focal length is the millimeter magnitude.
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| CN101329490B true CN101329490B (en) | 2011-03-16 |
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| CN104518420A (en) * | 2014-12-19 | 2015-04-15 | 北京工业大学 | Device and method for increasing output power of laser oscillator |
| EP3929638B1 (en) * | 2015-12-10 | 2023-07-19 | Nippon Telegraph And Telephone Corporation | Photonic crystal fiber and high-power light transmission system |
| CN109546524A (en) * | 2019-01-29 | 2019-03-29 | 英诺激光科技股份有限公司 | High-peak power low frequency passive mode-locking ultrafast laser |
| CN111562708B (en) * | 2020-05-28 | 2022-04-26 | 上海交通大学 | Two-photon frequency and discrete path super-entanglement generation method of nonlinear photonic crystal |
| CN113126202B (en) * | 2021-04-27 | 2022-04-19 | 电子科技大学 | Hollow anti-resonance optical fiber with ginkgo leaf-shaped cladding |
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