CN104516063A - Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same - Google Patents
Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same Download PDFInfo
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- CN104516063A CN104516063A CN201310452912.8A CN201310452912A CN104516063A CN 104516063 A CN104516063 A CN 104516063A CN 201310452912 A CN201310452912 A CN 201310452912A CN 104516063 A CN104516063 A CN 104516063A
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- sleeve
- optical fiber
- hot spot
- divergence angle
- output beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
Abstract
The invention relates to a device for increasing output beam spatial divergence angles and homogenizing light spots. The device comprises an optical fiber axially passing through a sleeve. The light outgoing end of the sleeve is provided with a concave lens coaxially installed with the optical fiber. The invention also provides a method for manufacturing the device. The concave lens is used to increase emergence angles of light beams and disperse light spots, that is, the light spots are homogenized, and light beam divergence angles are increased. A light spot of laser through a multi-mode fiber is in an annular shape. Thus, a laser source can be regarded to be formed by annular light sources of different divergence angles. The light spots of the series annular light sources are dispersed through a concave lens whose radius of curvature is relatively small, and phase is changed. The device has good mode mixing effect and decoherence effect, so as to increase light spot divergence angles and homogenize light spots.
Description
Technical field
The present invention relates to and a kind ofly increase device of output beam space divergence angle and homogenize hot spot and preparation method thereof, belong to the technical field of fiber optics.
Background technology
Through the LASER Light Source that multimode optical fiber exports, owing to having multiple high-order mode distribution form when laser transmits in multimode optical fiber, cause outgoing laser beam to there is the phenomenon of hot spot band, skewness, and mutually interfere between light beam, form the interference imaging point of arbitrariness, be called " speckle ".In the optical system of traditional use LASER Light Source, fly's-eye lens generally can be used in the optical path as the core optical element of light spot homogenizing, also can increase diffusion sheet in light path to weaken speckle, these diffusion sheets generally adopt fixed installation, vibrations or rotation mode.Visible, hot spot band, speckle phenomena add the complexity of optical system when LASER Light Source uses in night vision field.In addition, because laser has high directivity, and be subject to the restriction of output optical fibre numerical aperture, beam divergence angle is limited, thus limits the irradiated area of light source.
Under normal circumstances, by increasing lens combination at laser output, scioptics optical transform reaches increases the object of beam divergence angle, but the cost of this mode is higher, installs complicated, is also unfavorable for preparing compact conformation, equipment that volume is little simultaneously.
The method of carrying out homogenize conventional to multimode optical fiber output optical fibre is coiled optical fiber, apply stress, such as, Chinese patent document CN101630045 discloses a kind of device improving spacial distribution of output beams of multimode fibers, this device is made up of two workpiece with relief staggered relatively, clamping one section of optical fiber in the middle of workpiece, by applying pressure to these two workpiece, the multimode optical fiber of transmission laser is made to be subject to single-point in very short length, the external carbuncle of multiple spot or continuous distribution, change the communication mode distribution of light in multimode optical fiber, thus reach the effect of homogenize hot spot.The method external force extrudes optical fiber, easily causes optical fiber to damage and energy loss, and increases pressurizing unit on the transmission fiber, affect product appearance.
U.S. patent documents 6810175 proposes a kind of homogenize output beam energy, makes hot spot become the method for flat-top hot spot.The main technical schemes of the method is one end laser being first coupled into a graded index fiber, and the step optical fiber phase welding that the other end of graded index fiber is larger with numerical aperture, bending coiling is carried out to step optical fiber simultaneously, pattern is mixed, Output of laser energy even is distributed, thus obtains flat-top distribution hot spot.The shortcoming of this device is that implementation is complicated, and required device volume is large, and installation difficulty is large, is unfavorable for batch production.
Chinese patent document CN102012564A proposes a kind of method for homogenizing output light spots of optical fiber coupling output semiconductor laser; that one end of mixed mold materials is fixed on lock pin; then optical fiber and mixed mold materials are intertwined; observe hot spot simultaneously; make it without the dark heart, without the ring of light and electric torch phenomenon; finally fix both relative positions, install connector and put protective casing.The method increases mixed mold materials and increases casing diameter in fiber optic protection sleeve pipe, and the hardness of laser instrument tail optical fiber also can increase greatly, not easily bends during use, because this reducing the dirigibility of laser instrument putting position.
Chinese patent document CN102135668A discloses a kind of collimating apparatus of fiber laser, it optical lens comprising lens barrel, be fixed on the output tail optical fiber of this lens barrel front end and be fixed in this lens barrel, the rear end face of this output tail optical fiber is positioned at the focus place of this optical lens, and described optical lens comprises biconcave lens and the biconvex lens of the same optical axis arranged in turn along light path.Collimating apparatus of the present invention, the doublet that its optical lens is mainly made up of the biconcave lens of positive spherical aberration and the biconvex lens of negative spherical aberration, this doublet can eliminate system aberration, thus the beam quality of output beam does not reduce substantially after guarantee collimator and extender, maintain the advantage that fiber laser beam quality is high; And this doublet manufacture craft is simple, cost is low, reduces the processing cost of collimating apparatus.Meanwhile, the invention also discloses a kind of fiber laser with above-mentioned collimating apparatus, this Invention Announce be a kind of device reducing beam divergence angle, system complex and volume is large.
The open one-dimension optical-fiber compression coupling laser transmission device of Chinese patent document CN201828712U relates to a kind of semiconductor laser beam transmission optics system, is mainly used in the pulsed laser beam shaping in laser armed forces in real combat countermeasure system and Energy Transfer.Be made up of semiconductor laser, optical fiber, collimating optic lens group, semiconductor laser, optical fiber, collimating optic lens group three part are integrally packaged together, in semiconductor laser front portion, optical fiber is installed, optical fiber front portion is provided with collimating optic lens group, collimating optic lens group is a balsaming lens, is made up of laser entrance lens and exit lens.This device is applicable to carry out beam collimation to the laser of c-mount or TO packing forms, but the single die peak power of international mature is about 10W at present, greatly limit the range of application of this device.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of device increasing output beam space divergence angle and homogenize hot spot.Application the present invention can effectively improve hot spot band, speckle phenomena, carries out homogenize to hot spot, increases output beam space divergence angle simultaneously.
The present invention also provides a kind of preparation method of said apparatus.
Technical scheme of the present invention is as follows:
Increase a device for output beam space divergence angle and homogenize hot spot, comprise the optical fiber axially across sleeve, be provided with the concavees lens installed with described optical fiber coaxial at the bright dipping end of described sleeve.
Preferred according to the present invention, described concavees lens are one side concavees lens.
Preferred according to the present invention, described concavees lens are double concave lens.
Preferred according to the present invention, in described sleeve, described optical fiber is axially arranged in described sleeve pipe by connector contact pin.
Preferred according to the present invention, described sleeve is closed cylinder.
Preferred according to the present invention, the barrel of described sleeve is provided with axially open.
Preferred according to the present invention, described sleeve is metal sleeve or ceramic sleeve.
Preferred according to the present invention, the surface of described concavees lens is provided with anti-reflection film; Anti-reflection film and required transmission optical maser wavelength adapt, and diameter and the sleeve diameter of described concavees lens match so that make fiber end face and concavees lens concentric.
Preferred according to the present invention, the diameter of described optical fiber is 100-1000 μm.
Preferred according to the present invention, the radius-of-curvature of described concavees lens is: 1-10mm.
Preferred according to the present invention, described concavees lens concave surface and fiber end face are fitted.The concave surface of described concavees lens is air gap to fiber end face centre or is filled with corresponding matching fluid.
A preparation method for the device of above-mentioned increase output beam space divergence angle and homogenize hot spot, comprises step as follows:
(1) by optical fiber penetration protecting pipe, respectively expose one section of cylindric optical fiber at the two ends of protection tube, optical fiber coating is removed;
(2) the above-mentioned cylindric optical fiber exposed is passed in the connector contact pin of encapsulating, expose the fore-end of optical fiber;
(3) encapsulating in connector contact pin is cured;
(4) after solidification, the cylindrical fiber being exposed to connector contact pin outside is removed, form fiber end face, fiber end face is ground, obtains the optical flat vertical with fiber optic hub axle, make optical patchcord;
(5) be arranged in sleeve by coaxial for concavees lens, connector contact pin inserted sleeve from sleeve one end, concavees lens and connector contact pin are close to and fix;
(6), when using, the other end of described optical patchcord to be connected with laser output with flange and to fix.
Preferred according to the present invention, described optical patchcord is ST optical patchcord, FC optical patchcord or SMA905 optical patchcord.The pottery of the connector on described optical patchcord or metal external diameter can be thicker or thin than stock size.
Beneficial effect of the present invention:
A kind of one end increasing the device of output beam space divergence angle and homogenize hot spot of the present invention is added the output terminal of concavees lens, and on concavees lens, be coated with anti-reflection film, thus reduce the reflection loss of concavees lens, the use of concavees lens can increase the emergence angle of light beam, dispersion hot spot, both homogenize was carried out to hot spot, in turn increased beam divergence angle.Hot spot is circlewise after multimode optical fiber for laser, thus, LASER Light Source can be regarded as and be made up of the annular light source of the different angle of divergence, this series of annular light source hot spot after the concavees lens that radius-of-curvature is less disperses and phase place changes, there is well mixed imitating really and eliminating coherence effect, thus the hot spot angle of divergence and homogenize hot spot can be increased.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is apparatus of the present invention using method figure of embodiment 2;
Fig. 3 is that optical fiber described in embodiment 1,2 is to the design sketch of the homogenize hot spot of light beam;
Fig. 4 is that comparative example states the design sketch of optical fiber to the homogenize hot spot of light beam;
Fig. 5 is the schematic diagram that concavees lens of the present invention increase optical fiber output beam space divergence angle.
In Fig. 1-5: 1, concavees lens; 2, sleeve; 3, connector contact pin; 4, optical fiber; 5, connector loose mail; 6, optical patchcord tail cover; 7, optical fiber protective tube.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, but is not limited thereto.
Embodiment 1,
As shown in Figure 1.
Increase a device for output beam space divergence angle and homogenize hot spot, comprise the optical fiber 4 axially across sleeve 2, the bright dipping end of described sleeve 2 is provided with the concavees lens 1 with the coaxial installation of described optical fiber 4.The diameter of described optical fiber 4 is 440 μm.
Described concavees lens 1 are one side concavees lens.The radius-of-curvature of described concavees lens 1 is 1mm.
In described sleeve 2, described optical fiber 4 is axially arranged in described sleeve pipe 2 by connector contact pin 3.
Described sleeve 2 is the cylinder closed.
Described sleeve 2 is metal sleeve.
Embodiment 2,
A kind of device increasing output beam space divergence angle and homogenize hot spot as described in Example 1, its difference is, described concavees lens 1 are double concave lens.The radius-of-curvature of described concavees lens is about 1mm.
The barrel of described sleeve is provided with axially open.
Described sleeve is ceramic sleeve.
The diameter of described optical fiber is 300 μm.
Embodiment 3,
A kind of device increasing output beam space divergence angle and homogenize hot spot as described in Example 1, its difference is, the surface of described concavees lens 1 is provided with anti-reflection film, and anti-reflection film and required transmission optical maser wavelength adapt: described anti-reflection film is the anti-reflection film of 808nm.Diameter and the sleeve diameter of described concavees lens match so that make fiber end face and concavees lens concentric.
Described concavees lens concave surface and fiber end face are fitted.The concave surface of described concavees lens is air gap to fiber end face centre or is filled with corresponding matching fluid.
The diameter of described optical fiber is 200 μm.
The radius-of-curvature of described concavees lens is: 3mm.
Embodiment 4,
A kind of device increasing output beam space divergence angle and homogenize hot spot as described in Example 1, its difference is, be coated with anti-reflection film on described concavees lens 1 surface, described anti-reflection film is the anti-reflection film of 980nm.
Described concavees lens 1 are plano-concave lens.The diameter of described optical fiber 4 308 μm.
Utilize the optical patchcord comparatively ordinary optic fibre transmitting beam prepared by this embodiment, its light spot homogenizing is respond well, and beam divergence angle obviously increases.
The radius-of-curvature of described concavees lens is: 6mm.
Embodiment 5,
As described in embodiment 1-4, increase a preparation method for the device of output beam space divergence angle and homogenize hot spot, comprise step as follows:
(1) by optical fiber 4 penetration protecting pipe 7, respectively expose one section of cylindric optical fiber 4 at the two ends of protection tube 7, optical fiber coating is removed;
(2) the above-mentioned cylindric optical fiber 4 exposed is passed in the connector contact pin 3 of encapsulating, expose the fore-end of optical fiber 4;
(3) encapsulating in connector contact pin 3 is cured;
(4) after solidification, the cylindrical fiber being exposed to connector contact pin 3 outside is removed, form fiber end face, fiber end face is ground, obtains the optical flat vertical with fiber optic hub axle, make optical patchcord;
(5) be arranged in sleeve 2 by coaxial for concavees lens 1, connector contact pin 3 inserted sleeve 2 from sleeve one end, concavees lens 1 and connector contact pin 3 are close to and fix;
(6), when using, the other end of described optical patchcord to be connected with laser output with flange and to fix.
Described optical patchcord is ST optical patchcord, FC optical patchcord or SMA905 optical patchcord.The pottery of the connector on described optical patchcord or metal external diameter can be thicker or thin than stock size.
Operation instruction and principle:
When using device of the present invention, be connected the other end of optical patchcord with flange with laser output, some glue is fixed, as its optical patchcord output terminal of Fig. 4 to laser instrument the 808nm light beam that sends carry out homogenize hot spot.
Illustrate that optical fiber of the present invention increases the principle of optical fiber output beam space divergence angle and homogenize hot spot further combined with Fig. 4 below:
As shown in Figure 5, A, B are the different light in the direction of propagation that two ring light sources on fiber end face send, be irradiated to the diverse location of concavees lens respectively, known, the light inlet angle of divergence is respectively α, β, after concavees lens, divergence of beam angle becomes δ, γ respectively, because concavees lens have disperse function to light, known, δ > α, γ > β, thus the object realizing mixed mould and the increase angle of divergence, as can be seen here, described device is conducive to increasing beam divergence angle, the successful of its homogenize hot spot.
Comparative example,
The optical patchcord used in this comparative example is the diameter of cylindric optical fiber, cylindric optical fiber is identical in length and material and embodiment 1, and the light beam parameters of the laser light source adopted is also identical with embodiment 1.
CCD is adopted to record spot pattern, contrast test is used as to the homogenize hot spot of optical fiber described in embodiment 1 and existing cylindric optical fiber: Fig. 3 is the design sketch of optical fiber described in embodiment 1 to the homogenize hot spot of light beam, in Fig. 3, spot center speckle obviously reduces, and hot spot becomes evenly; And Fig. 4 is comparative example states the design sketch of optical fiber to the homogenize hot spot of light beam, in Fig. 4 there is a large amount of speckle in hot spot.
In sum, utilize the device comparatively ordinary optic fibre transmitting beam prepared by the present invention, homogenize hot spot is respond well, and beam divergence angle obviously increases.
Claims (10)
1. increase a device for output beam space divergence angle and homogenize hot spot, it is characterized in that, this device comprises the optical fiber axially across sleeve, is provided with the concavees lens installed with described optical fiber coaxial at the bright dipping end of described sleeve.
2. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, described concavees lens are one side concavees lens or double concave lens.
3. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, in described sleeve, described optical fiber is axially arranged in described sleeve pipe by connector contact pin.
4. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, described sleeve is closed cylinder.
5. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, the barrel of described sleeve is provided with axially open.
6. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 4 or 5, is characterized in that, described sleeve is metal sleeve or ceramic sleeve.
7. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, the surface of described concavees lens is provided with anti-reflection film; Anti-reflection film and required transmission optical maser wavelength adapt, and diameter and the sleeve diameter of described concavees lens match so that make fiber end face and concavees lens concentric.
8. a kind of device increasing output beam space divergence angle and homogenize hot spot according to claim 1, is characterized in that, the diameter of described optical fiber is 100-1000 μm; The radius-of-curvature of described concavees lens is: 1-10mm; Described concavees lens concave surface and fiber end face are fitted.
9. as described in claim 1-8, increase a preparation method for the device of output beam space divergence angle and homogenize hot spot, comprise step as follows:
(1) by optical fiber penetration protecting pipe, respectively expose one section of cylindric optical fiber at the two ends of protection tube, optical fiber coating is removed;
(2) the above-mentioned cylindric optical fiber exposed is passed in the connector contact pin of encapsulating, expose the fore-end of optical fiber;
(3) encapsulating in connector contact pin is cured;
(4) after solidification, the cylindrical fiber being exposed to connector contact pin outside is removed, form fiber end face, fiber end face is ground, obtains the optical flat vertical with fiber optic hub axle, make optical patchcord;
(5) be arranged in sleeve by coaxial for concavees lens, connector contact pin inserted sleeve from sleeve one end, concavees lens and connector contact pin are close to and fix;
(6), when using, the other end of described optical patchcord to be connected with laser output with flange and to fix.
10. the preparation method of the device of increase output beam space divergence angle according to claim 9 and homogenize hot spot, is characterized in that, described optical patchcord is ST optical patchcord, FC optical patchcord or SMA905 optical patchcord.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310452912.8A CN104516063B (en) | 2013-09-27 | 2013-09-27 | Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same |
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| CN201310452912.8A CN104516063B (en) | 2013-09-27 | 2013-09-27 | Device for increasing output beam spatial divergence angle and homogenizing light spot and method for manufacturing same |
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| CN104516063A true CN104516063A (en) | 2015-04-15 |
| CN104516063B CN104516063B (en) | 2017-02-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221134A (en) * | 2020-03-12 | 2020-06-02 | 北京凯普林光电科技股份有限公司 | Light beam shaper of semiconductor laser and manufacturing method |
| CN112748499A (en) * | 2019-10-30 | 2021-05-04 | 山东华光光电子股份有限公司 | Optical fiber manufacturing method for improving light spot homogenization |
| CN114253001A (en) * | 2021-12-27 | 2022-03-29 | 江苏大学 | Uniform light spot shaping system |
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| CN102436573A (en) * | 2011-07-15 | 2012-05-02 | 东莞市中控电子技术有限公司 | Image acquisition and recognition device with active lighting function |
| CN202815264U (en) * | 2012-07-09 | 2013-03-20 | 北京大族天成半导体技术有限公司 | Optical fiber coupling structure |
| CN103047613A (en) * | 2013-01-15 | 2013-04-17 | 深圳市华星光电技术有限公司 | Light guiding system, side-inlet type backlight module and liquid crystal display |
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Patent Citations (5)
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| US5504350A (en) * | 1992-08-12 | 1996-04-02 | Spectra-Physics Scanning Systems, Inc. | Lens configuration |
| TW201126201A (en) * | 2010-01-20 | 2011-08-01 | Hirose Tech Co Ltd | Beam correcting projection apparatus |
| CN102436573A (en) * | 2011-07-15 | 2012-05-02 | 东莞市中控电子技术有限公司 | Image acquisition and recognition device with active lighting function |
| CN202815264U (en) * | 2012-07-09 | 2013-03-20 | 北京大族天成半导体技术有限公司 | Optical fiber coupling structure |
| CN103047613A (en) * | 2013-01-15 | 2013-04-17 | 深圳市华星光电技术有限公司 | Light guiding system, side-inlet type backlight module and liquid crystal display |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748499A (en) * | 2019-10-30 | 2021-05-04 | 山东华光光电子股份有限公司 | Optical fiber manufacturing method for improving light spot homogenization |
| CN111221134A (en) * | 2020-03-12 | 2020-06-02 | 北京凯普林光电科技股份有限公司 | Light beam shaper of semiconductor laser and manufacturing method |
| CN114253001A (en) * | 2021-12-27 | 2022-03-29 | 江苏大学 | Uniform light spot shaping system |
| WO2023123044A1 (en) * | 2021-12-27 | 2023-07-06 | 江苏大学 | Uniform light spot shaping system |
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