CN105762620A - Optical fiber laser capable of achieving self cooling and making method thereof - Google Patents
Optical fiber laser capable of achieving self cooling and making method thereof Download PDFInfo
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- CN105762620A CN105762620A CN201610304686.2A CN201610304686A CN105762620A CN 105762620 A CN105762620 A CN 105762620A CN 201610304686 A CN201610304686 A CN 201610304686A CN 105762620 A CN105762620 A CN 105762620A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses an optical fiber laser capable of achieving self cooling and a making method thereof.The left end of a double-cladding active optical fiber (204) capable of achieving self cooling is connected with a forward optical fiber pumping light beam combiner (203), and the right end of the double-cladding active optical fiber (204) is connected with a reverse optical fiber pumping light beam combiner (205); a signal pumping laser (207) is connected with the forward optical fiber pumping light beam combiner (203), and a refrigeration pumping laser (208) is connected with the reverse optical fiber pumping light beam combiner (205).According to the optical fiber laser capable of achieving self cooling and the making method thereof, signal lasers and a refrigeration effect are generated through two lasers of pumping wavelength respectively, the heat dissipation pressure of a large-power optical fiber laser is relieved, and reliability and work stability of the optical fiber laser are improved; meanwhile the optical fiber laser is structurally compatible with a traditional optical fiber laser, and process feasibility is achieved.
Description
Technical field
The present invention relates to a kind of self cooled optical fiber laser and preparation method thereof
Background technology
Owing to the surface area of fiber optic materials own is relatively big to the ratio of volume, the good beam quality of output, the advantages such as volume is little, optical fiber laser experienced by quick development in recent years, and the Output optical power that current Rear Earth Doped Fiber Laser can obtain improves constantly.But, along with the raising of luminous power, the caloric value of active doping optical fibre also gets more and more.One of heat dissipation problem bottleneck problem becoming high power fiber laser of Active Optical Fiber.Optical fiber laser can be produced a lot of negative effects, such as fiber mode change, thermal lensing effect, optical fiber fuse effect, optical fiber damage etc. by the heating of this optical fiber.Although the heating problem of Active Optical Fiber can be alleviated to a certain extent by modes such as air-cooled, water-cooleds, but all can not tackle the problem at its root.This patent proposes a new technology, effectively the heating of Active Optical Fiber in optical fiber laser being absorbed, on the whole, the caloric value of Active Optical Fiber is obviously reduced, fundamentally inhibiting the heating of Active Optical Fiber, space has been expanded in the development for the optical fiber laser of bigger luminous power.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of self cooled optical fiber laser and preparation method thereof, and the method reduces the heating of Active Optical Fiber effectively from inside of optical fibre, alleviates the heating problem of optical fiber laser.
The technical solution used in the present invention is: a kind of self cooled optical fiber laser, by luminous power absorber, fiber grating I, forward direction optical fiber pump light bundling device, double-cladding active optical fiber, reverse optical fiber pump light bundling device, fiber grating II, signal pump laser, refrigeration pump laser, output collimation isolator, it is characterised in that: the left end of described double-cladding active optical fiber and the connection of forward direction optical fiber pump light bundling device, right-hand member and reverse optical fiber pump light bundling device connect；Signal pump laser is connected with forward direction optical fiber pump light bundling device, and signal pump laser is connected with reverse optical fiber pump light bundling device, and the right-hand member of fiber grating I is connected with forward direction optical fiber pump light bundling device, left end is connected with luminous power absorber；Fiber grating II left end is connected with reverse optical fiber pump light bundling device, and right-hand member is connected with the input of output collimation isolator.
Described double-cladding active optical fiber, is made up of fibre core, inner cladding, surrounding layer and coat, is provided with inner cladding and surrounding layer between described fibre core and coat, and its fibre core core diameter is 8～20 microns, and inner cladding diameter is 100～400 microns.
The manufacture method of a kind of self cooled optical fiber laser, comprises the following steps:
1), double-cladding active optical fiber makes: using fluoride glass as substrate, the two kinds of rare earth elements that adulterate make the prefabricated rods of double-cladding active optical fiber；Fibre core mixes the first impurity neodymium (Nd) and the second impurity ytterbium (Yb), above-mentioned preform is become doubly clad optical fiber by fiber drawing tower, and outside bare fibre, coats coat；
Described mixes the first impurity neodymium and the second impurity ytterbium in fibre core, and doping content is 1018～1020cm-3。
2), optical fiber laser optical system is built: by the laser coupled of forward direction optical fiber pump light bundling device and the signal pump laser of first wave length to double-cladding active optical fiber, reverse optical fiber pump light bundling device is by the laser coupled of the refrigeration pump laser of second wave length to double-cladding active optical fiber；Fiber grating I right-hand member is connected with forward direction optical fiber pump light bundling device, its left end is connected with luminous power absorber；Fiber grating II left end is connected with reverse optical fiber pump light bundling device, and its right-hand member is connected with the input of output collimation isolator.
3) optical fiber laser Circuits System, is built: be connected with each signal pump laser, refrigeration pump laser by the drive source of optical fiber laser, control circuit is connected with each drive source circuit and supervisory circuit, and interface circuit is connected with laser control circuit and outer computer.
4), debugging is run: start refrigeration pump laser, optical fiber is made to be in refrigerating state, enabling signal pump laser, optical fiber is made to be in laser output condition, in turn increasing the power of power and signal pump laser of refrigeration pump laser, allow the power of two pump lasers arrive desired value gradually, the now heating of optical fiber laser and refrigeration are substantially at poised state, when not affecting Output of laser, the heating of Active Optical Fiber is suppressed.
The present invention, 1, the caloric value of active gain fibre is significantly decreased in optical fiber laser.2, the requirement of refrigeration system in optical fiber laser is reduced.3, the beam aberration that thermal lensing effect causes is avoided.4, freezing by the mode of Raman light scattering, process is all solid state, and reliability is high, stable performance.5, need except the wavelength shift of extra implant and refrigeration pumping except active doping optical fibre, all can be compatible with common optical fiber laser for other parts.
Accompanying drawing explanation
Fig. 1 is the structural representation of the double-cladding active optical fiber of the present invention；
Fig. 2 is optical fiber laser structure schematic diagram of the present invention；
Fig. 3 is doped fiber lasing process intermediate ion and photon interaction schematic diagram；
Fig. 4 is photon and the phonon interaction of the anti-Stokes Raman scattering process in doped fiber；
In figure: 201 luminous power absorbers, 202 fiber gratings I, 203 forward direction optical fiber pump light bundling devices, 204 double-cladding active optical fibers, 2041 fibre cores, 2042 inner claddings, 2043 surrounding layers, 2044 coats, 205 reverse optical fiber pump light bundling devices, 206 fiber gratings II, 207 signal pump lasers, 208 refrigeration pump lasers, 209 output collimation isolators, the ground state level of 301#1 dopant ion, the metastable energy level of 302#1 dopant ion, the excited level of 303#1 dopant ion, first ground state level of 401#2 dopant ion, second ground state level of 402#2 dopant ion, the first excited state energy level of 403#2 dopant ion, the Second Excited State energy level of 404#2 dopant ion.
Detailed description of the invention
A kind of self cooled optical fiber laser, by luminous power absorber 201, fiber grating I 202, forward direction optical fiber pump light bundling device 203, double-cladding active optical fiber 204, reverse optical fiber pump light bundling device 205, fiber grating II 206, signal pump laser 207, refrigeration pump laser 208, output collimation isolator 209, left end and the forward direction optical fiber pump light bundling device 203 of double-cladding active optical fiber 204 connect, right-hand member and reverse optical fiber pump light bundling device 205 connect；Signal pump laser 207 is connected with forward direction optical fiber pump light bundling device 203, and refrigeration pump laser 208 is connected with reverse optical fiber pump light bundling device 205.
Described double-cladding active optical fiber 204, it is made up of fibre core 2041, inner cladding 2042, surrounding layer 2043 and coat 2044, being provided with inner cladding 2042 and surrounding layer 2043 between fibre core 2041 and coat 2044, its fibre core core diameter is 8～20 microns, and inner cladding diameter is 100～400 microns.
The manufacture method of a kind of self cooled optical fiber laser, comprises the following steps:
1, double-cladding active optical fiber makes: using fluoride glass as substrate, the two kinds of rare earth elements that adulterate make the prefabricated rods of double-cladding active optical fiber；Mixing the first impurity neodymium and the second impurity ytterbium in fibre core 2041,2042 is the inner cladding of optical fiber, and 2043 is optical fiber jacket, above-mentioned preform becomes doubly clad optical fiber on fiber drawing tower, and coats coat 2044 outside bare fibre；Being mixed with the first impurity neodymium (Nb) and the second impurity ytterbium (Yb) in its fibre core 2041, doping content is 1018～1020cm-3。
In the doubly clad optical fiber having source doping, the first foreign ion, under the effect of first wavelength pumping laser, forms population inversion, produces light amplification by stimulated radiation and sends laser；The second foreign ion, under second wavelength laser pumping, absorbs phonon by anti-Stokes scattering, produces refrigeration.
Use fluoride glass fiber, suitably select the kind of fluoride so that above-mentioned anti-Stokes effect can be effectively taking place.A kind of selection of optimization be adopt zirconium (Zr), boron (B), lanthanum (La), aluminum (Al), sodium (Na), plumbous (Pb) heavy metal fluoride as matrix material of optic fibre；Other impurity and defect in active double clad fiber to reduce as far as possible, reduce the probability that non-radiative recombination occurs；The lower level width of refrigeration doped chemical is less than average phonon energy, the photon energy of refrigeration pumping laser is suitable with the relatively low transition energy of refrigeration impurity, to promote the anti-Stokes Raman scattering in optical fiber, it is suppressed that the Stokes Raman scattering in optical fiber.
2, optical fiber laser optical system is built: coupleding in double-cladding active optical fiber 204 by the signal pump laser 207 of forward direction optical fiber pump light bundling device 203 with first wave length, the refrigeration pump laser 208 of second wave length is coupled in double-cladding active optical fiber 204 by reverse optical fiber pump light bundling device 205；Fiber grating I 202 right-hand member is connected with forward direction optical fiber pump light bundling device 203, its left end is connected with luminous power absorber 201；Fiber grating II 206 left end is connected with reverse optical fiber pump light bundling device 205, and its right-hand member is connected with the input of output collimation isolator 209.
3) optical fiber laser Circuits System, is built: be connected with each signal pump laser 207, refrigeration pump laser 208 by the drive source of optical fiber laser, control circuit is connected with each drive source circuit and supervisory circuit, and interface circuit is connected with laser control circuit and outer computer.
4), debugging is run: start refrigeration pump laser 208, optical fiber is made to be in refrigerating state, enabling signal pump laser 207, optical fiber is made to be in laser output condition, in turn increasing the power of power and signal pump laser of refrigeration pump laser, allow the power of two pump lasers arrive desired value gradually, the now heating of optical fiber laser and refrigeration are substantially at poised state, when not affecting Output of laser, the heating of Active Optical Fiber is suppressed.
Embodiment 1:
One prepares high power CW optical fiber laser method, its step:
Step one: fluorine glass optical fiber makes.Using fluoride glass as substrate, the two kinds of rare earth elements that adulterate make the prefabricated rods of active double clad fluorine glass optical fiber.Mixing the first impurity neodymium and the second impurity ytterbium in fibre core 2041,2042 is the inner cladding of optical fiber, and 2043 is optical fiber jacket, and 2044 is coat.Above-mentioned preform is become doubly clad optical fiber by fiber drawing tower, and outside bare fibre, coats coat.The structure of this double-cladding active optical fiber is as shown in Figure 1.
Step 2: build optical fiber laser optical system.Above-mentioned active double clad fluorine glass optical fiber is utilized to make high power CW optical fiber laser.The structure of continuous wave high power optical fiber laser is as shown in Figure 2.
Step 3: build optical fiber laser Circuits System.The drive source of semiconductor laser is connected with each signal pump laser 207, refrigeration pump laser 208, control circuit is connected with each drive source circuit and supervisory circuit, interface circuit is connected with laser control circuit and outer computer.
Step 4: run debugging.Start refrigeration pump laser 208 so that optical fiber is in cooled state, but starts this refrigeration pumping and be adjusted to reduced levels.Enabling signal pump laser 207 so that optical fiber is in laser output condition, but starts this pumping and be adjusted to reduced levels so that it is caloric value is not too big.Then in turn increase the power of the power and signal pump laser of refrigeration pump laser, allow the power of two pump lasers arrive desired value gradually.The now heating of optical fiber laser and refrigeration are substantially at poised state, and when not affecting Output of laser, the heating of Active Optical Fiber is suppressed.
The present invention and conventional laser the difference is that: present invention employs the fluorine glass optical fiber of dual element doping, instead of traditional silicon dioxide single element doped fiber；Present invention employs two different pumpings, be first pumping lasing for optical fiber laser respectively, the second pumping is for the refrigeration cool-down of Active Optical Fiber.
Principle illustrates as follows: under the excitation of first wave length pumping laser, in active double clad fluorine glass optical fiber, #1 dopant ion produces optical gain region, gain region and two, left and right are formed optical resonator by fiber grating I 202 and the fiber grating II 206 of identical central reflection wavelength, and produce laser.Under the excitation of second wave length pumping laser, in active double clad fluorine glass optical fiber, #2 dopant ion produces anti-Stokes Raman scattering, absorbs phonon, sends a bigger Raman scattering photon of energy.Phonon can take away the heat in Active Optical Fiber, and scattered photon have left double-cladding active optical fiber to external radiation.
Laser generating process in active double clad fluorine glass optical fiber is as shown in Figure 3.In lasing process, #1 dopant ion is transitted to excited state 303 from ground state 301 by the pumping laser of #1 wavelength, then passes through and non-radiative transfers in metastable state 302, again through stimulated radiation, transits to ground state 301, create signal laser simultaneously.In this process, the Excited state of photon is converted into heat, makes optical fiber generate heat.
Process of refrigerastion in active double clad fluorine glass optical fiber is as shown in Figure 4.In process of refrigerastion, ion in dopant ion #2 is transitted to excited state 403 from ground state 402 by the pumping laser of #2 wavelength, acoustical phonon promotes generation population transfer between excited state 401 and 402, ion is from excited state 404 radiation transistion to 401, send a Raman scattering photon, and absorb an energy equal to the optical phonon of energy level difference between 401 and 402.This anti-Stokes Raman scattering process, absorbs the heat of Active Optical Fiber by taking away an optical phonon, reaches the effect of refrigeration.
The core of the present embodiment is to adopt codope double clad fluorine glass optical fiber, and by dual wavelength pumping, while producing stimulated radiation, the method walking heat with anti-Stokes Raman scattered band partly or entirely offsets the heating in optical fiber laser lasing process.Alleviate the heat dissipation problem of high power fiber laser.Doped chemical can select in multiple rare earth element, to coordinate signal pumping wavelength and refrigeration pump pumping wavelength.In some cases, if the first dopant ion is under the first pump light effect, the laser photon energy produced is exactly equal to the photon energy of the second required pump light, then can save the second pumping, and a part for direct signal laser is carried out pumping the second ion and is produced anti-Stokes Raman fluorescence, the Active Optical Fiber of optical fiber laser thus freezing, simplifies the structure of optical fiber laser.
Above-described embodiment is only for illustrating technology design and the feature of the present invention; its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this; can not limit the scope of the invention with this; all equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. a self cooled optical fiber laser, by luminous power absorber (201), fiber grating I (202), forward direction optical fiber pump light bundling device (203), double-cladding active optical fiber (204), reverse optical fiber pump light bundling device (205), fiber grating II (206), signal pump laser (207), refrigeration pump laser (208), output collimation isolator (209), it is characterized in that: the left end of described double-cladding active optical fiber (204) and forward direction optical fiber pump light bundling device (203) connect, right-hand member and reverse optical fiber pump light bundling device (205) connect；Signal pump laser (207) is connected with forward direction optical fiber pump light bundling device (203), refrigeration pump laser (208) is connected with reverse optical fiber pump light bundling device (205), and the right-hand member of fiber grating I (202) is connected with forward direction optical fiber pump light bundling device (203), left end is connected with luminous power absorber (201)；Fiber grating II (206) left end is connected with reverse optical fiber pump light bundling device (205), and right-hand member is connected with the input of output collimation isolator (209).
2. the self cooled optical fiber laser of one according to claim 1, it is characterized in that: described double-cladding active optical fiber 204, it is made up of fibre core (2041), inner cladding (2042), surrounding layer (2043) and coat (2044), inner cladding (2042) and surrounding layer (2043) it is provided with between described fibre core (2041) and coat (2044), its fibre core core diameter is 8～20 microns, and inner cladding (2042) diameter is 100～400 microns.
3. the manufacture method of a self cooled optical fiber laser as claimed in claim 1, it is characterised in that: comprise the following steps:
1), double-cladding active optical fiber makes: using fluoride glass as substrate, the two kinds of rare earth elements that adulterate make the prefabricated rods of double-cladding active optical fiber；Fibre core (2041) mixes the first impurity neodymium (Nd) and the second impurity ytterbium (Yb), above-mentioned preform is become doubly clad optical fiber by fiber drawing tower, and outside bare fibre, coats coat (2044)；
2), optical fiber laser optical system is built: by the laser coupled of forward direction optical fiber pump light bundling device (203) and the signal pump laser (207) of first wave length to double-cladding active optical fiber (204), reverse optical fiber pump light bundling device (205) is by the laser coupled of the refrigeration pump laser (208) of second wave length to double-cladding active optical fiber (204)；Fiber grating I (202) right-hand member is connected with forward direction optical fiber pump light bundling device (203), its left end is connected with luminous power absorber (201)；Fiber grating II (206) left end is connected with reverse optical fiber pump light bundling device (205), and its right-hand member is connected with the input of output collimation isolator (209)；
3) optical fiber laser Circuits System, is built: be connected with each signal pump laser (207), refrigeration pump laser (208) by the drive source of optical fiber laser, control circuit is connected with each drive source circuit and supervisory circuit, and interface circuit is connected with laser control circuit and outer computer；
4), debugging is run: start refrigeration pump laser (208), optical fiber is made to be in refrigerating state, enabling signal pump laser (207), optical fiber is made to be in laser output condition, increase the power of the power and signal pump laser of refrigeration pump laser successively, the power allowing two pump lasers gradually arrives desired value, the now heating of optical fiber laser and refrigeration are in state in a basic balance, when not affecting Output of laser, the heating of Active Optical Fiber is suppressed.
4. the method preparing optical fiber laser according to claim 1, it is characterized in that: described step 1) in Active Optical Fiber (204) in fibre core (2041), mix the first impurity neodymium and the second impurity ytterbium, its doping content is 1018～1020cm-3。
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| CN201610304686.2A CN105762620A (en) | 2016-05-10 | 2016-05-10 | Optical fiber laser capable of achieving self cooling and making method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103738A (en) * | 2018-08-03 | 2018-12-28 | 华中科技大学 | A kind of solid state laser of full pumping zero heat of range |
| CN117134178A (en) * | 2023-10-27 | 2023-11-28 | 武汉光谷航天三江激光产业技术研究院有限公司 | High-stability spectrum synthesis method and device cooled by laser |
-
2016
- 2016-05-10 CN CN201610304686.2A patent/CN105762620A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109103738A (en) * | 2018-08-03 | 2018-12-28 | 华中科技大学 | A kind of solid state laser of full pumping zero heat of range |
| CN117134178A (en) * | 2023-10-27 | 2023-11-28 | 武汉光谷航天三江激光产业技术研究院有限公司 | High-stability spectrum synthesis method and device cooled by laser |
| CN117134178B (en) * | 2023-10-27 | 2024-02-13 | 武汉光谷航天三江激光产业技术研究院有限公司 | High-stability spectrum synthesis method and device cooled by laser |
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