CN100372198C - Dual-side pumping double-cladding green-light fiber laser using intracavity double frequency technology - Google Patents
Dual-side pumping double-cladding green-light fiber laser using intracavity double frequency technology Download PDFInfo
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- CN100372198C CN100372198C CNB200610043065XA CN200610043065A CN100372198C CN 100372198 C CN100372198 C CN 100372198C CN B200610043065X A CNB200610043065X A CN B200610043065XA CN 200610043065 A CN200610043065 A CN 200610043065A CN 100372198 C CN100372198 C CN 100372198C
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Abstract
The present invention discloses a green optical fiber laser with double claddings for frequency doubling in a pumping cavity with double surfaces, which is composed of a front end output device for pumping light, a front end optical fiber device with double claddings, a frequency doubling device, a tail end optical fiber device with double claddings, a tail end output device for pumping light, and a coupling output device, wherein the front end output device for pumping light is connected with the front end optical fiber device with double claddings by welding optical fibers; the front end optical fiber device with double claddings, the frequency doubling device and the tail end optical fiber device with double claddings are connected in turn by the optical fibers and form a resonant cavity; the coupling output device is arranged behind the rear end optical fiber device with double claddings; a laser beam with frequency doubling is accurately outputted by the coupling output device; the tail end output device for pumping light is arranged just above the coupling output device. The present invention improves the absorption efficiency of the pumping light by the optical fiber with double claddings. Besides, the present invention uses the intracavity frequency doubling technology to improve the frequency doubling efficiency so as to output the frequency-doubling laser light with large power.
Description
Technical field
The invention belongs to laser technology field, relate to fiber laser, particularly a kind of powerful efficient intracavity frequency doubling produces the double-side pumping intracavity frequency doubling double clad green-light fiber laser of green laser output.
Background technology
Fiber laser reaches good series of advantages such as thermal stability by everybody broad research with its miniaturization, full curing, and especially good outlet has been found in the high power output that appears as fiber laser of double-clad laser.But because the restriction on material and the production technology makes the wave-length coverage of double-clad optical fiber laser less, thereby uses various frequency convener technologies to come its frequency is expanded into the focus of present research.What realize the main employing of green glow optical-fiber laser output at present is switch technology or cavity external frequency multiplication technology on the optical fiber.Go up switch technology and adopt, because the restriction of its mechanism makes the power output of its green laser very low; And adopting the cavity external frequency multiplication technology, its efficient is then lower.Mostly adopt the mode of single face pumping from pump mode, make the distribution of pump light in the fiber work medium very inhomogeneous like this, thereby reduced the absorption efficiency of working media greatly, and influenced the quality of laser beam pump light.And because the more use of non-fiber optic components in fiber laser, loss is significantly risen, and influenced the beam quality of laser, and powerful laser output also is very restricted, and efficient, stable, the incorporate characteristics of fiber laser are far from bringing into play.
Summary of the invention
The objective of the invention is to overcome above-mentioned prior art deficiency, a kind of double-side pumping intracavity frequency doubling double clad green-light fiber laser is provided, its optical fiber integration degree height, can realize the output of high-power green laser.
Technical scheme of the present invention is achieved in that
Double-side pumping intracavity frequency doubling double clad green-light fiber laser of the present invention is made of front end pump optical output device, front end doubly clad optical fiber device, frequency multiplication device, terminal doubly clad optical fiber device, terminal pump optical output device, output coupler.On horizontal optical path, front end pump optical output device is connected by the welding between the optical fiber with front end doubly clad optical fiber device; Front end doubly clad optical fiber device, frequency multiplication device and terminal doubly clad optical fiber device are connected by optical fiber successively, and form resonant cavity; After the terminal doubly clad optical fiber device output coupler is set, the double-frequency laser bundle is by the output of output coupler collimation; Terminal pump optical output device on the vertical optical path be arranged on output coupler directly over, the pump light of terminal pump optical output device output incides in the output coupler with the direction perpendicular to horizontal output double-frequency laser light path.
Described front end pump optical output device is made up of first power source of semiconductor laser, the first semiconductor laser optical fiber output module and conical fiber.First power source of semiconductor laser is connected with the first semiconductor laser optical fiber output module; The fine output of the first semiconductor laser optical fiber output module magnetic tape trailer and conical fiber are connected with welding between the conical fiber by tail optical fiber.
The pump light wavelength of this front end pump optical output device output is consistent with the peak absorbtivity wavelength of the first doubly clad optical fiber core material.
Described front end doubly clad optical fiber device is made up of the fiber grating and first doubly clad optical fiber.The left end of fiber grating is connected by the welding between the optical fiber with conical fiber in the front end pump optical output device; The right-hand member of fiber grating is connected by the welding between the optical fiber with the left end of first doubly clad optical fiber.
This fiber grating is high saturating to pump light, and is high anti-to fundamental frequency light.
Described frequency multiplication device is made up of left optical fiber contact pins, first GRIN Lens, frequency-doubling crystal, second GRIN Lens, right optical fiber contact pins.Be positioned on the same horizontal optical path from left to right in turn, wherein left optical fiber contact pins is inserted and fiber end face is close to first GRIN Lens in the right side of first doubly clad optical fiber in the front end doubly clad optical fiber device, paste the right side of left side optical fiber contact pins and the left side of first GRIN Lens, the left side of frequency-doubling crystal is close in the first GRIN Lens right side, the second GRIN Lens left side is close in the right side of frequency-doubling crystal, and paste the right side of second GRIN Lens and the left side of right optical fiber contact pins.
Wherein frequency-doubling crystal is the nonlinear crystal to fundamental light wave appearance position coupling or accurate phase matched, as KTP KTP, beta-barium borate BBO, three lithium borate LBO, periodic polarized crystal such as KTP PPKTP.
Described terminal doubly clad optical fiber device is made up of second doubly clad optical fiber and double color plate.Wherein the left end of second doubly clad optical fiber inserts in the right optical fiber contact pins in the frequency multiplication device, and its fiber end face is close to second GRIN Lens in the frequency multiplication device; The right-hand member of second doubly clad optical fiber is close to the double color plate surface by the adjusting of optical fiber adjusting bracket.
This double color plate plating is to the high transmittance film of pump light, frequency doubled light, to the high-reflecting film of fundamental frequency light.
Described terminal pump optical output device is made of second power source of semiconductor laser and semiconductor laser module with collimation output, second power source of semiconductor laser with have the semiconductor laser module that collimation exports and be connected.
The pump light centre wavelength of terminal pump optical output device output should be consistent with the peak absorbtivity wavelength of the second doubly clad optical fiber core material, and consistent with the pump light centre wavelength of front end pump optical output device output.
Described output coupler is made up of optical coupling lens group and dichroic mirror.After the optical coupling lens group dichroic mirror is set, both are on same horizontal optical path.
This dichroic mirror plating, is placed with 45 ° of inclination angles the high transmittance film of frequency doubled light the high-reflecting film of pump light.
Described first doubly clad optical fiber and second doubly clad optical fiber are the doubly clad optical fibers with identical parameters: fibre core is doping ytterbium ion Yb
3+Crystal or glass, and the cross-sectional profile of inner cladding is rectangle or D shape.
Described frequency-doubling crystal is the nonlinear crystal to fundamental light wave appearance position coupling or accurate phase matched, the plating of frequency-doubling crystal left side is to the high transmittance film of pump light, fundamental frequency light, to the high anti-deielectric-coating of frequency doubled light, the right side plating is to the high transmittance film of pump light, fundamental frequency light, frequency doubled light.
The present invention adopts the intracavity frequency doubling mode, and adopts double-side pumping laser work mode, thereby has solved problems such as the low and single face pumping pumping efficiency of cavity external frequency multiplication efficient is low, and the power output of double-frequency laser is significantly improved.Fiber grating, conical fiber and optical fiber fuse the use of technology simultaneously, have significantly reduced the use of non-fiber optic components.So just significantly reduced the bigger device loss of various non-fiber optic components, output power of laser is improved, simultaneously the integrated degree of fiber laser and stability thereof have been greatly improved.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
Embodiment
With reference to shown in Figure 1, structure of the present invention is as follows: first power source of semiconductor laser 7 is connected with semiconductor laser optical fiber output module 8, semiconductor laser optical fiber output module 8 and conical fiber 9 are connected with welding between the conical fiber by tail optical fiber, the right-hand member of conical fiber 9 is connected by the welding between the optical fiber with the left end of fiber grating 10, the right-hand member of fiber grating 10 is connected by the welding between the optical fiber with the left end of first doubly clad optical fiber 11, the right-hand member of first doubly clad optical fiber 11 inserts in the left optical fiber contact pins 12 and its fiber end face is close to first GRIN Lens 13, left side optical fiber contact pins 12, first GRIN Lens 13, frequency-doubling crystal 14, second GRIN Lens 15, right optical fiber contact pins 16 is positioned on the same horizontal optical path from left to right in turn, paste the right side of left side optical fiber contact pins 12 and the left side of first GRIN Lens 13, the left side of frequency-doubling crystal 14 is close in first GRIN Lens, 13 right sides, second GRIN Lens, 15 left sides are close in the right side of frequency-doubling crystal 14, paste the left side of the right side of second GRIN Lens 15 and right optical fiber contact pins 16, the left end of second doubly clad optical fiber 17 inserts in the right optical fiber contact pins 16 and its fiber end face is close to second GRIN Lens 15, the right-hand member of second doubly clad optical fiber 17 is close to the surface of double color plate 18 by the adjusting of optical fiber adjusting bracket, set gradually optical coupling lens group 21 behind the double color plate 18, with with the dichroic mirror 22 of horizontal optical path placement at 45, and the three is on same collimated light path, semiconductor laser module 20 with collimation output is set directly over the dichroic mirror 22, and the semiconductor laser module 20 with collimation output is connected with second power source of semiconductor laser 19.
Double-side pumping intracavity frequency doubling double clad green-light fiber laser of the present invention, its concrete course of work is: the 975nm pump light that front end pump optical output device 1 provides, the coupling of the conical fiber 9 by being fused to tail optical fiber is injected into front end doubly clad optical fiber device 2 from left end, the 975nm pump light that terminal pump optical output device 5 of while provides, enter terminal doubly clad optical fiber device 4 by output coupler 6 from right-hand member coupling focusing, reach the effect of double-side pumping, and will be by front end doubly clad optical fiber device 2, first doubly clad optical fiber 11 in the resonant cavity that frequency multiplication device 3 and terminal doubly clad optical fiber device 4 are formed and second doubly clad optical fiber 17 activate, produce the light generation of 1080nm fundamental frequency, realize the intracavity frequency doubling effect through frequency multiplication device 3 again, produce the 540nm green glow, finally by output coupler 6 collimation outputs.
Described front end pump optical output device 1 is made up of first power source of semiconductor laser 7, semiconductor laser optical fiber output module 8 and conical fiber 9.First power source of semiconductor laser 7 provides the stable power input for semiconductor laser optical fiber output module 8; The commercial semiconductor laser module that this semiconductor laser optical fiber output module 8 is the fine output of magnetic tape trailer, centre wavelength is adjustable continuously in 975nm, power output, peak power output is 25W, the tail optical fiber diameter is 800um, numerical aperture is 0.22, and the output center wavelength of this semiconductor laser optical fiber output module 8 is consistent with the peak absorbtivity wavelength of first doubly clad optical fiber, 11 core materials; Conical fiber 9 is of a size of: the input end fiber diameter is .800um, numerical aperture is 0.22, the fibre diameter of output is 350um, the conical fiber total length is 2.0m, wherein tapered zone length is 1.5m, this conical fiber and other optical fiber fuse by the big fibre core machine of fusing, and encapsulate by suitable ultraviolet glue again.
Described front end doubly clad optical fiber device 2 is made up of the fiber grating 10 and first doubly clad optical fiber 11.Wherein fiber grating 10 adopts the phase mask method to be made on the double clad light-sensitive optical fibre, to 975nm light high saturating (transmitance＞99%), to 1080nm light high anti-(reflectivity＞99%); First doubly clad optical fiber, 11 fibre cores are doping ytterbium ion (Yb
3+) crystal or glass, and the cross-sectional profile of inner cladding is rectangle or D shape, in the present embodiment, adopts the doubly clad optical fiber of homemade D shape inner cladding, fibre core is doping ytterbium ion (Yb
3+) quartz crystal, maximum absorption band is positioned at 975nm, core diameter is 18 μ m, numerical aperture is 0.12, inner cladding is of a size of 350/400um, numerical aperture is 0.46, doping content is 6500ppm, fiber lengths is 20m.
Described frequency multiplication device 3 is made up of left optical fiber contact pins 12, first GRIN Lens 13, frequency-doubling crystal 14, second GRIN Lens 15, right optical fiber contact pins 16.Wherein frequency-doubling crystal 14 is the nonlinear crystals to fundamental light wave appearance position coupling or accurate phase matched, as KTP (KTP), beta-barium borate (BBO), three lithium borates (LBO), periodic polarized KTP crystal such as (PPKTP).Adopt the KTP (KTP) to 1080nmII class phase matched in this experimental example, frequency-doubling crystal is of a size of 4 * 4 * 6mm
3, the high transmittance film (transmitance＞95%) of its left side plating 975nm, 1080nm, the deielectric-coating of 540nm high anti-(reflectivity＞98%), the high transmittance film (transmitance＞95%) of right side plating 975nm, 1080nm, 540nm.
Described terminal doubly clad optical fiber device 4 is by second doubly clad optical fiber 17, and double color plate 18 is formed.18 couples of 975nm of double color plate, 540nm light high saturating (transmitance＞95%) are to 1080nm light high anti-(reflectivity＞98%).Second doubly clad optical fiber 17 is the optical fiber that has identical parameters with first doubly clad optical fiber 11, and length is 20m.
Described terminal pump optical output device 5 is made up of second power source of semiconductor laser 19, semiconductor laser module 20 with collimation output.Second power source of semiconductor laser 19 provides the stable power input for the semiconductor laser module 20 with collimation output; Semiconductor laser module 20 with collimation output is the commercial semiconductor lasers with collimation output, its output center wavelength is 975nm, power output is adjustable continuously, and peak power output is 30W, and its output wavelength is consistent with the peak absorbtivity wavelength of second doubly clad optical fiber 17.
Described output coupler 6 is made up of optical coupling lens group 21 and dichroic mirror 22, optical coupling lens group 21 wherein is a kind of lens combinations by particular design, the 540nm double-frequency laser is collimated, and the pump light coupling that will have the 975nm that collimates semiconductor laser module 20 outputs of exporting simultaneously focuses in the terminal doubly clad optical fiber device 4; 22 pairs of 975nm pump lights of dichroic mirror high anti-(reflectivity＞98%), to 540nm frequency doubled light high saturating (transmissivity＞95%), and tiltedly place with horizontal optical path angle lapping at 45, it separates pump light and frequency doubled light: the 540nm double-frequency laser of collimation is from its right side transmission output, the 975nm pump light of semiconductor laser module 20 outputs of collimation output simultaneously incides output coupler 6 directly over vertical with horizontal optical path, reflect into into optics coupled lens group 21 by dichroic mirror 22.
The double-side pumping intracavity frequency doubling double clad green-light fiber laser of present embodiment, can obtain good beam quality, the single mode double-frequency laser output that average power is big, and efficient height, good stability, the volume of laser are little, the life-span is long, be the desirable lasing light emitter that produces green laser, wide application prospect arranged in fields such as laser television, laser medicines.
Claims (9)
1. double-side pumping intracavity frequency doubling double clad green-light fiber laser, comprise front end pump optical output device (1), it is characterized in that on horizontal optical path, front end pump optical output device (1) and front end doubly clad optical fiber device (2) are by between the optical fiber. welding be connected; Front end doubly clad optical fiber device (2), frequency multiplication device (3) and terminal doubly clad optical fiber device (4) are connected by optical fiber successively, form resonant cavity; Terminal doubly clad optical fiber device (4) is provided with output coupler (6) afterwards, and the double-frequency laser bundle is by output coupler (6) horizontal output; Terminal pump optical output device (5) on the vertical optical path be arranged on output coupler (6) directly over, the pump light of terminal pump optical output device (5) output incides in the output coupler (6) with the direction perpendicular to horizontal output double-frequency laser light path.
2. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described front end pump optical output device (1) is made up of first power source of semiconductor laser (7), semiconductor laser optical fiber output module (8) and conical fiber (9), and first power source of semiconductor laser (7) is connected with semiconductor laser optical fiber output module (8); The fine output of semiconductor laser optical fiber output module (8) magnetic tape trailer also is connected with welding between the conical fiber by tail optical fiber with conical fiber (9),
The pump light wavelength of this front end pump optical output device (1) output is consistent with the peak absorbtivity wavelength of first doubly clad optical fiber (11) core material.
3. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described front end doubly clad optical fiber device (2) is made up of fiber grating (10) and first doubly clad optical fiber (11), and the left end of fiber grating (10) is connected by the welding between the optical fiber with conical fiber (9) in the front end pump optical output device (1); The right-hand member of fiber grating (10) is connected by the welding between the optical fiber with the left end of first doubly clad optical fiber (11);
This fiber grating (10) is high saturating to pump light, and is high anti-to fundamental frequency light.
4. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described frequency multiplication device (3) is by left optical fiber contact pins (12), first GRIN Lens (13), frequency-doubling crystal (14), second GRIN Lens (15) and right optical fiber contact pins (16) are formed, be positioned on the same collimated light path from left to right in turn, wherein first doubly clad optical fiber (11) in the front end doubly clad optical fiber device (2) inserts left optical fiber contact pins (12) and fiber end face is close to first GRIN Lens (13), paste the right side of left side optical fiber contact pins (12) and the left side of first GRIN Lens (13), the left side of frequency-doubling crystal (14) is close in first GRIN Lens (13) right side, second GRIN Lens (15) left side is close in the right side of frequency-doubling crystal (14), and paste the left side of the right side of second GRIN Lens (15) and right optical fiber contact pins (16);
Wherein frequency-doubling crystal (14) is the nonlinear crystal to fundamental light wave appearance position coupling or accurate phase matched, refers to KTP KTP, beta-barium borate BBO, three lithium borate LBO, periodic polarized KTP PPKTP crystal.
5. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described terminal doubly clad optical fiber device (4) is made up of second doubly clad optical fiber (17) and double color plate (18), wherein the left end of second doubly clad optical fiber (17) inserts the right optical fiber contact pins (16) in the frequency multiplication device (3), and fiber end face is close to second GRIN Lens (15); The right-hand member of second doubly clad optical fiber (17) is regulated the surface of being close to double color plate (18) by the optical fiber adjusting bracket;
This double color plate (18) plating is to the high transmittance film of pump light, frequency doubled light, to fundamental frequency light high-reflecting film.
6. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described terminal pump optical output device (5) is by second power source of semiconductor laser (19) and have semiconductor laser module (20) formation of collimation output, and second power source of semiconductor laser (19) is connected with the semiconductor laser module (20) with collimation output;
The pump light centre wavelength of terminal pump optical output device (5) output is consistent with the peak absorbtivity wavelength of second doubly clad optical fiber (17) core material, and consistent with the pump light centre wavelength of front end pump optical output device (1) output.
7. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 1, it is characterized in that, described output coupler (6) is made up of optical coupling lens group (21) and dichroic mirror (22), wherein after the optical coupling lens group (21) dichroic mirror (22) is set, both are on same horizontal optical path
This dichroic mirror (22) plating is placed with 45 ° of inclination angles to the high-reflecting film of pump light, to the high transmittance film of frequency doubled light.
8. according to claim 3 or 5 described double-side pumping intracavity frequency doubling double clad green-light fiber lasers, it is characterized in that, described first doubly clad optical fiber (11) and second doubly clad optical fiber (17) are the doubly clad optical fibers with identical parameters, and fibre core is doping ytterbium ion Yb
3+Crystal or glass, the cross-sectional profile of inner cladding is rectangle or D shape.
9. double-side pumping intracavity frequency doubling double clad green-light fiber laser according to claim 4, it is characterized in that, described frequency-doubling crystal (14) is the nonlinear crystal to fundamental light wave appearance position coupling or accurate phase matched, the left side plating of frequency-doubling crystal (14) is to the high transmittance film of pump light, fundamental frequency light, to the high anti-deielectric-coating of frequency doubled light, the right side plating is to the high transmittance film of pump light, fundamental frequency light, frequency doubled light.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200610043065XA CN100372198C (en) | 2006-06-29 | 2006-06-29 | Dual-side pumping double-cladding green-light fiber laser using intracavity double frequency technology |
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| CN102751654B (en) * | 2012-06-29 | 2013-11-06 | 西北大学 | Converged optical fiber laser intracavity frequency doubling device |
| CN105591268A (en) * | 2016-02-29 | 2016-05-18 | 深圳英诺激光科技有限公司 | Large power fiber laser with inner cavity frequency doubling |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0762570A2 (en) * | 1995-09-06 | 1997-03-12 | Hewlett-Packard Company | Laser for the generation of blue light |
| US5805631A (en) * | 1994-09-08 | 1998-09-08 | The Regents Of The University Of California | Blue, green, orange, and red upconversion laser |
| CN1444316A (en) * | 2003-04-25 | 2003-09-24 | 中国科学院上海光学精密机械研究所 | Doubly-cladded optical fibre intracavity frequency multiplication laser |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5805631A (en) * | 1994-09-08 | 1998-09-08 | The Regents Of The University Of California | Blue, green, orange, and red upconversion laser |
| EP0762570A2 (en) * | 1995-09-06 | 1997-03-12 | Hewlett-Packard Company | Laser for the generation of blue light |
| CN1444316A (en) * | 2003-04-25 | 2003-09-24 | 中国科学院上海光学精密机械研究所 | Doubly-cladded optical fibre intracavity frequency multiplication laser |
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