CN201160194Y - Optical fiber laser with continuously adjustable output laser beam quality - Google Patents
Optical fiber laser with continuously adjustable output laser beam quality Download PDFInfo
- Publication number
- CN201160194Y CN201160194Y CNU2008200557585U CN200820055758U CN201160194Y CN 201160194 Y CN201160194 Y CN 201160194Y CN U2008200557585 U CNU2008200557585 U CN U2008200557585U CN 200820055758 U CN200820055758 U CN 200820055758U CN 201160194 Y CN201160194 Y CN 201160194Y
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- optical fiber
- clad optical
- beam quality
- laser
- doubly clad
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Abstract
The utility model relates to an optical fiber laser device with continuously adjustable output laser beam quality. The optical fiber laser device comprises a semiconductor laser pumping source, an optical fiber grating and an active thick-core double-clad optical fiber; wherein the tail fiber of the semiconductor laser pumping source is fused with the optical fiber grating. The utility model is characterized in that the optical fiber laser device also comprises a metal tube, an adjuster and a collimating lens. The active thick-core double-clad optical fiber is tightly coiled inside the metal tube, the input end of the active thick-core double-clad optical fiber is fused with the optical fiber grating, the output end thereof is connected with the collimating lens, and the adjuster is composed of a bolt penetrating through the diameter of the metal tube from the side and an adjusting nut nested at the other end of the bolt. Through the optical fiber laser device, output laser with continuously adjustable laser beam quality can be obtained; the structure is simple, the operation is convenient, and the optical fiber laser device is convenient for promotion.
Description
Technical field
The utility model relates to fiber laser, the continuously adjustable fiber laser of particularly a kind of output laser beam quality, utilize the bending loss characteristic of different mode in the thick core multimode doubly clad optical fiber, carry out pattern control, realize the adjustable continuously of output laser beam quality.
Background technology
The characteristics of double-clad optical fiber laser and advantage are the waveguiding structure that it is unique, can realize the single-mode laser output of nearly diffraction limit.But the restriction of single mode condition makes that the core diameter of optical fiber is still very little.Though adopt thick core multimode fiber to solve possible light injury and the nonlinear effect problem of fiber end face under the high power, the beam quality of output laser descends, and in order to improve beam quality, people adopt the whole bag of tricks to improve beam quality.But the fiber laser of relevant output beam quality continuous variable has not yet to see report.
People have proposed a kind of mode selection techniques based on the optical fiber macrobending loss according to the bending loss theory of Marcuse, optical fiber closely are wrapped in the single mode laser oscillation of having realized the multimode doubly clad optical fiber on the cylinder of certain radius or amplify output.But in this method, cylindrical radius is fixed, thereby the fiber reel bent radius of going for a stroll also fixes, and can't realize the laser output of variable beam quality.If will change the beam quality of output laser, optical fiber must be wrapped on the cylinder of another different radii again, waste time and energy, operation inconvenience, and damage optical fiber easily.
Summary of the invention
In order to overcome the technical barrier that above-mentioned existing fiber laser laser beam quality can not continuously change, the utility model proposes the continuously adjustable fiber laser of a kind of output laser beam quality, this fiber laser does not need to carry out again optical fiber and twines, and just can realize the convenient adjusting of output beam quality.
Technical solution of the present utility model is as follows:
The doubly clad optical fiber that adopts thick core multimode utilizes the bending loss characteristic difference of different mode in the fibre core to carry out modeling as gain media, comes the control beam quality by the degree that changes fibre-optical bending.The technical scheme that adopts is to rely on himself tension force to be close to the inwall of metal cylinder thick core doubly clad optical fiber, make it cross section by external force extrusion metal tube and become ellipse, at the long axis of ellipse two ends, radius of curvature is littler than the original face of cylinder, reaches the purpose that fiber reel diminishes around radius.When the laser of the different output beam qualities of needs, just can conveniently realize by the shape that changes the cylinder cross section.
Concrete technical solution of the present utility model is as follows:
The continuously adjustable fiber laser of a kind of output laser beam quality, comprise the semiconductor laser pumping source, fiber grating and active thick core doubly clad optical fiber, the tail optical fiber in described semiconductor laser pumping source and described fiber grating welding, it is characterized in that metal cylinder in addition, adjuster and collimating lens, the inner disc that described active thick core doubly clad optical fiber is close to described metal cylinder around, the input of described active thick core doubly clad optical fiber and described fiber grating welding, the described collimating lens of output termination of this active thick core doubly clad optical fiber, described adjuster is made up of bolt that passes described metal cylinder diameter from the side and the adjusting nut that is enclosed within this bolt other end.
The core material of described active thick core doubly clad optical fiber is the quartz or the glass of rare earth doped ytterbium ion or neodymium ion.
The diameter of described active thick core doubly clad optical fiber fibre core is greater than 18 μ m, and the cross section of optical fiber inner cladding is a rectangle, or D shape, or other polygon.
Described semiconductor laser pumping source is the semiconductor laser by tail optical fiber output, the absorbing wavelength of its emission wavelength and described active thick core doubly clad optical fiber core material is complementary, and the diameter of described tail optical fiber and numerical aperture all are not more than the relevant parameter of described active thick core doubly clad optical fiber inner cladding.
Described fiber grating is the fiber grating of double clad structure, be to inscribe the fiber grating have with the corresponding to high reflectance of excitation wavelength of described active thick core doubly clad optical fiber, the diameter of described fiber grating fibre core and inner cladding is consistent with the diameter and the numerical aperture of described active thick core doubly clad optical fiber with numerical aperture.
Described metal cylinder is by having better elastic and flexible sheet metal is made, and the diameter of this metal cylinder is less than 10cm.
The pump light that send in described semiconductor laser pumping source is coupled into the inner cladding of active thick core doubly clad optical fiber by fiber grating, realizes the population inversion in the fibre core, and the laser of generation is by the output of collimating lens collimation.Make the cross section of cylinder become ellipse from circle by adjuster, the also corresponding thereupon change of the coiling radius of curvature of doubly clad optical fiber, thus realize exporting the adjusting of laser beam quality.
Technique effect of the present utility model:
The continuously adjustable fiber laser of output laser beam quality of the present utility model changes the bending radius of doubly clad optical fiber by the shape that changes the metal cylinder cylinder, thereby has realized the adjusting of output beam quality.Compare with technology formerly, do not need to twine again optical fiber, can realize the adjusting of beam quality the utlity model has characteristics simple in structure, easy to adjust by the nut of regulating adjuster.
Description of drawings
Fig. 1 is the structural representation of the continuously adjustable fiber laser of the utility model output laser beam quality
Fig. 2 is the vertical view of metal cylinder of the present utility model and adjuster
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but should not limit protection range of the present utility model with this.
See also Fig. 1 and Fig. 2 earlier, as seen from the figure, the continuously adjustable fiber laser of the utility model output laser beam quality, comprise semiconductor laser pumping source 1, fiber grating 2 and active thick core doubly clad optical fiber 3, the tail optical fiber in described semiconductor laser pumping source 1 and 2 weldings of described fiber grating, be characterized in metal cylinder 4 in addition, adjuster 5 and collimating lens 6, the inner disc that described active thick core doubly clad optical fiber 3 is close to described metal cylinder 4 around, the input of described active thick core doubly clad optical fiber 3 and 2 weldings of described fiber grating, the described collimating lens 6 of the output termination of this active thick core doubly clad optical fiber 3, said adjuster 5 is made up of bolt that passes described metal cylinder 4 diameters from the side and the adjusting nut that is enclosed within this bolt other end.
Be the embodiment situation below:
In the present embodiment, the core material of active thick core doubly clad optical fiber 3 is doping Yb
3+The quartz glass of ion, the absworption peak of wavelength be at 915nm, 940nm and 975nm.The light that send in semiconductor laser pumping source 1 enters active thick core doubly clad optical fiber 3 through fiber grating 2, fiber grating 2 is to the pump light full impregnated, the fiber grating that the excitation wavelength of active thick core doubly clad optical fiber 3 is all-trans, in doubly clad optical fiber 3, be subjected to the modal loss that fibre-optical bending produces, carry out pattern control, by the good laser of collimating lens 6 output beam qualities.
The physical parameter of enumerating a specific embodiment is as follows:
As shown in Figure 1, pumping source 1 is a semiconductor laser, and centre wavelength is at 975nm, and by tail optical fiber output, fibre diameter is 400 μ m, and numerical aperture is 0.44, and power output is 30W.The tail optical fiber of semiconductor laser and doubly clad optical fiber grating 2 directly are welded together, and the core diameter of this fiber grating 2 is 30 μ m, and numerical aperture NA is 0.08, and centre wavelength is at 1085nm, bandwidth 0.5nm, reflectivity 99.4%.Fiber grating 2 and active thick core doubly clad optical fiber 3 diameter weldings all are coupled in the inner cladding of active thick core doubly clad optical fiber 3 pump light.Active thick core doubly clad optical fiber 3 is for mixing Yb
3+Thick core multimode fiber, core diameter is 30 μ m, and numerical aperture NA is 0.08, and the inner cladding diameter is 400 μ m, and numerical aperture NA is 0.46, fiber lengths is 10 meters.Active thick core doubly clad optical fiber 3 is close to the inboard of metal cylinder 4, and the diameter of metal cylinder is 10cm, and material is the acid bronze alloy with better elasticity and toughness, and the height of metal cylinder is 5cm.Adjuster 5 be installed in metal cylinder 4 side central authorities over against the position, by the rotation adjusting nut metal cylinder 4 is exerted pressure, change it and be shaped as ellipse, major axis two ends at ellipsoid, bending radius is littler than the original face of cylinder, the bending radius of active thick core doubly clad optical fiber 3 is diminished, increase the loss of high-rder mode, improve output beam quality.Continuously change the cross sectional shape of metal cylinder 4 by adjuster 5, just can obtain the laser output of different beam qualities, beam quality factor M
2Can continuously change 2.4～1.1.
In sum, the continuously adjustable fiber laser of output laser beam quality of the present utility model, adopt a semiconductor laser as pumping source, adopt a high reflectance at the fiber grating 2 of 1085nm wavelength as resonator mirror, active thick core doubly clad optical fiber is close to the coiling of metal cylinder inwall, has realized the adjusting of output laser beam quality by the cross sectional shape that changes metal cylinder.The utility model can obtain the continuously adjustable output laser of beam quality, has simple in structure and convenience operation, and is easy to utilize.
Claims (6)
1, the continuously adjustable fiber laser of a kind of output laser beam quality, comprise semiconductor laser pumping source (1), fiber grating (2) and active thick core doubly clad optical fiber (3), the tail optical fiber in described semiconductor laser pumping source (1) and described fiber grating (2) welding, it is characterized in that metal cylinder (4) in addition, adjuster (5) and collimating lens (6), the inner disc that described active thick core doubly clad optical fiber (3) is close to described metal cylinder (4) around, the input of described active thick core doubly clad optical fiber (3) and described fiber grating (2) welding, the described collimating lens of output termination (6) of this active thick core doubly clad optical fiber (3), described adjuster (5) is made up of bolt that passes described metal cylinder (4) diameter from the side and the adjusting nut that is enclosed within this bolt other end.
2, the continuously adjustable double-clad optical fiber laser of output laser beam quality according to claim 1, the core material that it is characterized in that described active thick core doubly clad optical fiber (3) is the quartz or the glass of rare earth doped ytterbium ion or neodymium ion.
3, the continuously adjustable double-clad optical fiber laser of output laser beam quality according to claim 2, the diameter that it is characterized in that described active thick core doubly clad optical fiber (3) fibre core is greater than 18 μ m, the cross section of optical fiber inner cladding is a rectangle, or D shape, or other polygon.
4. the continuously adjustable double-clad optical fiber laser of output laser beam quality according to claim 1, it is characterized in that described semiconductor laser pumping source (1) is the semiconductor laser by tail optical fiber output, the absorbing wavelength of its emission wavelength and described active thick core doubly clad optical fiber (3) core material is complementary, and the diameter of described tail optical fiber and numerical aperture all are not more than the relevant parameter of described active thick core doubly clad optical fiber (3) inner cladding.
5, require the continuously adjustable double-clad optical fiber laser of 1 described output laser beam quality according to letter of authorization, it is characterized in that described fiber grating (2) is the fiber grating of double clad structure, be to inscribe the fiber grating have with the corresponding to high reflectance of excitation wavelength of described active thick core doubly clad optical fiber (3), the diameter of described fiber grating (2) fibre core and inner cladding is consistent with the diameter and the numerical aperture of described active thick core doubly clad optical fiber (3) with numerical aperture.
6, require the continuously adjustable double-clad optical fiber laser of 1 described output laser beam quality according to letter of authorization, it is characterized in that described metal cylinder (4) by having better elastic and flexible sheet metal is made, the diameter of this metal cylinder (4) is less than 10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200557585U CN201160194Y (en) | 2008-02-27 | 2008-02-27 | Optical fiber laser with continuously adjustable output laser beam quality |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200557585U CN201160194Y (en) | 2008-02-27 | 2008-02-27 | Optical fiber laser with continuously adjustable output laser beam quality |
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| Publication Number | Publication Date |
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| CN201160194Y true CN201160194Y (en) | 2008-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200557585U Expired - Lifetime CN201160194Y (en) | 2008-02-27 | 2008-02-27 | Optical fiber laser with continuously adjustable output laser beam quality |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585965C (en) * | 2008-02-27 | 2010-01-27 | 中国科学院上海光学精密机械研究所 | Optical fiber laser with continuously adjustable quality for outputting laser beam |
| CN103107478A (en) * | 2013-01-29 | 2013-05-15 | 中国科学院上海光学精密机械研究所 | Dual-wavelength fiber laser with tunable power ratios |
-
2008
- 2008-02-27 CN CNU2008200557585U patent/CN201160194Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100585965C (en) * | 2008-02-27 | 2010-01-27 | 中国科学院上海光学精密机械研究所 | Optical fiber laser with continuously adjustable quality for outputting laser beam |
| CN103107478A (en) * | 2013-01-29 | 2013-05-15 | 中国科学院上海光学精密机械研究所 | Dual-wavelength fiber laser with tunable power ratios |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080227 |
|
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080227 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |