CN104516063B - 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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- CN104516063B CN104516063B CN201310452912.8A CN201310452912A CN104516063B CN 104516063 B CN104516063 B CN 104516063B CN 201310452912 A CN201310452912 A CN 201310452912A CN 104516063 B CN104516063 B CN 104516063B
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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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
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 a kind of increase output beam space divergence angle and homogenize device of hot spot and preparation method thereof, belong to
The optical technical field of optical fiber.
Background technology
LASER Light Source through multimode fibre output, due to having multiple high-order mode distributions when laser transmits in multimode fibre
Form, leads to outgoing laser beam to there is the phenomenon of hot spot band, skewness, and interferes between light beam, forms arbitrariness
Interference imaging point, referred to as " speckle ".In the optical system of traditional use LASER Light Source, typically can be in the optical path using multiple
Eyelenss, as the core optical element of light spot homogenizing, also can increase diffusion sheet to weaken speckle, these diffusion sheets one in light path
As using fixed installation, vibrations or rotation mode.It can be seen that, hot spot band, speckle phenomena increased LASER Light Source in night vision field
The complexity of optical system during use.Further, since laser has high directivity, and limited by output optical fibre numerical aperture
System, beam divergence angle is limited, thus limiting the irradiated area of light source.
Under normal circumstances, by increasing lens group in laser output, increase light beam is reached by optics of lens conversion and sends out
The purpose at scattered angle, but this mode is relatively costly, installs complicated, is also unfavorable for that preparation structure is compact, small volume simultaneously
Equipment.
Multimode fibre output optical fibre being carried out homogenize conventional method is optical fiber to be carried out coiling, applies stress, for example, in
State patent document cn101630045 discloses a kind of device improving spacial distribution of output beams of multimode fibers, and this device is by two
The individual workpiece with relief staggered relatively is constituted, one section of optical fiber of clamping in the middle of workpiece, by applying pressure to this two workpiece
Power, makes the multimode fibre of transmission laser be subject to the external carbuncle of single-point, multiple spot or continuous distribution in very short length, changes light and exist
Communication mode distribution in multimode fibre, thus reach the effect homogenizing hot spot.The method is extruded to optical fiber with external force, easily
Cause optical fiber to damage and energy loss, and increase pressurizing unit on the transmission fiber, affect product appearance.
U.S. patent documents 6810175 propose one kind and homogenize output beam energy, make hot spot be changed into the side of flat-top hot spot
Method.The main technical schemes of the method are that laser is first coupled into one end of a graded index fiber, and the other end of graded index fiber
The step optical fiber phase welding larger with numerical aperture, is curved coiling to step optical fiber simultaneously, pattern is mixed, make defeated
Go out laser energy to be uniformly distributed, thus obtaining flat-top distribution hot spot.The shortcoming of this device is that implementation is complicated, required apparatus body
Long-pending big, installation difficulty is big, is unfavorable for producing in batches.
It is even that Chinese patent document cn102012564a proposes a kind of output light spots of optical fiber coupling output semiconductor laser
Change method, is that one end of mixed mold materialss is fixed on lock pin, then optical fiber is intertwined with mixed mold materialss, observes simultaneously
Hot spot, so as to the no dark heart, the no ring of light and pocket lamp phenomenon, is finally fixed both relative positions, is installed upper binding head and put
Protection sleeve pipe.The method increases mixed mold materialss in fiber optic protection sleeve pipe and increases casing diameter, the hardness of laser instrument tail optical fiber
Can greatly increase, not pliable during use, therefore reduce the motility of laser instrument putting position.
Chinese patent document cn102135668a discloses a kind of collimator of optical fiber laser, and it includes lens barrel, fixation
In the output tail optical fiber of this lens barrel front end and be fixed on optical lenses in this lens barrel, the rear end face of this output tail optical fiber is located at this light
Learn the focal point of lens, described optical lenses include the biconcave lenss of same optical axis being sequentially arranged along light path and biconvex lens.This
The collimator of invention, the double lens that its optical lens is mainly made up of the biconcave lenss of positive spherical aberration and the biconvex lens of negative spherical aberration
Group, this doublet can eliminate system aberration, thus ensureing that the beam quality of output beam after collimator and extender does not reduce substantially,
Maintain the high advantage of optical fiber laser beam quality；And, this doublet processing technology is simple, low cost, reduces standard
The processing cost of straight device.Meanwhile, the invention also discloses a kind of optical fiber laser with above-mentioned collimator, this Invention Announce
It is a kind of device reducing beam divergence angle, system complex and volume is big.
The open one-dimension optical-fiber compression coupling laser transmission device of Chinese patent document cn201828712u is related to one kind and partly leads
Volumetric laser beam Propagation optical system, the pulsed laser beam shaping being mainly used in laser armed forces in real combat countermeasure system and energy pass
Defeated.It is made up of semiconductor laser, optical fiber, collimating optic lens group, semiconductor laser, optical fiber, collimating optic lens group three
Part as an overall package together, is provided with optical fiber in semiconductor laser front portion, optical fiber front portion is provided with collimated light
Learn lens group, collimating optic lens group is balsaming lenss, is made up of laser light incident lens and exit lens.This device is applied to
Beam collimation is carried out to the laser of c-mount or to packing forms, but the single die peak power of current international mature is about
For 10w, greatly limit the range of application of this device.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of dress increasing output beam space divergence angle and homogenizing hot spot
Put.The application present invention can be effectively improved hot spot band, speckle phenomena, and hot spot is homogenized, and increase output beam space simultaneously
The angle of divergence.
The present invention also provides a kind of preparation method of said apparatus.
Technical scheme is as follows:
A kind of increase output beam space divergence angle and homogenize the device of hot spot, including the optical fiber axially across sleeve,
The light end that goes out of described sleeve is provided with the concavees lens installed with described optical fiber coaxial.
According to currently preferred, described concavees lens are one side concavees lens.
According to currently preferred, described concavees lens are double concave lens.
According to currently preferred, in described sleeve, described optical fiber is axially mounted to described sleeve pipe by union joint contact pin
Interior.
The cylinder being closing according to currently preferred, described sleeve.
It is provided with axially open on barrel according to currently preferred, described sleeve.
According to currently preferred, described sleeve is metal sleeve or ceramic sleeve.
According to currently preferred, the surface of described concavees lens is provided with anti-reflection film；Anti-reflection film and required transmission laser
Wavelength is adapted, and the diameter of described concavees lens and sleeve diameter match, in order to make fiber end face and concavees lens concentric.
According to currently preferred, a diameter of 100-1000 μm of described optical fiber.
According to currently preferred, the radius of curvature of described concavees lens is: 1-10mm.
According to currently preferred, described concavees lens concave surface is fitted with fiber end face.The concave surface of described concavees lens and optical fiber
End face centre for air gap or is filled with corresponding matching fluid.
A kind of above-mentioned increase output beam space divergence angle and homogenize hot spot device preparation method, including step such as
Under:
(1) by optical fiber penetration protecting pipe, respectively expose one section of cylindric optical fiber at the two ends of protection pipe, by optical fiber coating
Remove；
(2) the above-mentioned cylindric optical fiber exposing is passed through in the union joint contact pin of encapsulating, expose the fore-end of optical fiber；
(3) encapsulating in union joint contact pin is solidified；
(4) after solidifying, the cylindrical fiber being exposed to outside union joint contact pin is removed, form fiber end face, to optical fiber end
Face is ground, and obtains the optical flat vertical with fiber optic hub axle, makes optical patchcord；
(5) concavees lens are coaxially mounted in sleeve, by union joint contact pin from the insertion sleeve of sleeve one end, by concavees lens
It is close to union joint contact pin and fix；
(6), when using, the other end flange of described optical patchcord is connected with laser output and fixes.
According to currently preferred, described optical patchcord is st optical patchcord, fc optical patchcord or sma905 optical patchcord.
The pottery of the union joint on described optical patchcord or metal external diameter can be thicker or thin than stock size.
Beneficial effects of the present invention:
A kind of output beam space divergence angle and the one end of the device homogenizing hot spot of increasing of the present invention is to have added concavees lens
Outfan, and anti-reflection film is coated with concavees lens, thus reducing the reflection loss of concavees lens, the use of concavees lens can increase
The angle of emergence of light beam, disperses hot spot, both hot spot was homogenized, and increased beam divergence angle again.Laser light after multimode fibre
Speckle circlewise, thus, can regard as and be made up of the annular light source of the different angles of divergence, and this series of annular light source is through curvature by LASER Light Source
After the less concavees lens of radius, hot spot dissipates and phase place changes, and has to mix well and imitates fruit and eliminating coherence effect, thus
The hot spot angle of divergence can be increased and homogenize hot spot.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is apparatus of the present invention using method figure of embodiment 2；
Fig. 3 is the design sketch homogenizing hot spot to light beam for the optical fiber described in embodiment 1,2；
Fig. 4 is that comparative example states the design sketch homogenizing hot spot to light beam for the optical fiber；
Fig. 5 is the schematic diagram that concavees lens of the present invention increase optical fiber output light beam space divergence angle.
In Fig. 1-5: 1, concavees lens；2nd, sleeve；3rd, union joint contact pin；4th, optical fiber；5th, union joint loose mail；6th, optical patchcord tail
Set；7th, optical fiber protective tube.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, but not limited to this.
Embodiment 1,
As shown in Figure 1.
A kind of device increasing output beam space divergence angle and homogenizing hot spot, including the optical fiber 4 axially across sleeve 2,
Go out the concavees lens 1 that light end is provided with installation coaxial with described optical fiber 4 in described sleeve 2.A diameter of 440 μm of described optical fiber 4.
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 mounted in described sleeve pipe 2 by union joint contact pin 3.
Described sleeve 2 is the cylinder of closing.
Described sleeve 2 is metal sleeve.
Embodiment 2,
A kind of device increasing output beam space divergence angle and homogenizing 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 about 1mm.
It is provided with axially open on the barrel of described sleeve.
Described sleeve is ceramic sleeve.
A diameter of 300 μm of described optical fiber.
Embodiment 3,
A kind of device increasing output beam space divergence angle and homogenizing hot spot as described in Example 1, its difference is,
The surface of described concavees lens 1 is provided with anti-reflection film, anti-reflection film is adapted with required transmission optical maser wavelength: described anti-reflection film is
The anti-reflection film of 808nm.The diameter of described concavees lens and sleeve diameter match, in order to make fiber end face and concavees lens concentric.
Described concavees lens concave surface is fitted with fiber end face.It is air gap in the middle of the concave surface of described concavees lens and fiber end face
Or it is filled with corresponding matching fluid.
A diameter of 200 μm of described optical fiber.
The radius of curvature of described concavees lens is: 3mm.
Embodiment 4,
A kind of device increasing output beam space divergence angle and homogenizing hot spot as described in Example 1, its difference is,
It is 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 planoconcave lenses.308 μm of the diameter of described optical fiber 4.
Using the optical patchcord prepared by this embodiment compared with ordinary optic fibre transmitting beam, its light spot homogenizing is respond well,
And beam divergence angle significantly increases.
The radius of curvature of described concavees lens is: 6mm.
Embodiment 5,
A kind of preparation method increasing output beam space divergence angle as described in embodiment 1-4 and homogenizing the device of hot spot,
Comprise the following steps that
(1) by optical fiber 4 penetration protecting pipe 7, respectively expose one section of cylindric optical fiber 4 at the two ends of protection pipe 7, optical fiber is applied
Coating removes；
(2) the above-mentioned cylindric optical fiber 4 exposing is passed through in the union joint contact pin 3 of encapsulating, expose the leading section of optical fiber 4
Point；
(3) encapsulating in union joint contact pin 3 is solidified；
(4) after solidifying, the cylindrical fiber being exposed to outside union joint contact pin 3 is removed, form fiber end face, to optical fiber end
Face is ground, and obtains the optical flat vertical with fiber optic hub axle, makes optical patchcord；
(5) concavees lens 1 are coaxially mounted in sleeve 2, by union joint contact pin 3 from sleeve one end insertion sleeve 2, will be recessed
Lens 1 and union joint contact pin 3 are close to and fixing；
(6), when using, the other end flange of described optical patchcord is connected with laser output and fixes.
Described optical patchcord is st optical patchcord, fc optical patchcord or sma905 optical patchcord.On described optical patchcord
The pottery of union joint or metal external diameter can be thicker or thin than stock size.
Operation instruction and principle:
During using device of the present invention, the other end flange of optical patchcord is connected with laser output, point
Glue is fixed, and the 808nm light beam as its optical patchcord outfan of Fig. 4 is sent to laser instrument carries out homogenizing hot spot.
Illustrate that optical fiber of the present invention increases optical fiber output light beam space divergence angle and homogenizes light with reference to Fig. 4 further below
The principle of speckle:
As shown in figure 5, the different light in the direction of propagation that sent by two ring light sources on fiber end face of a, b, respectively according to
Be mapped to the diverse location of concavees lens it is known that, enter the light angle of divergence be respectively α, β, after concavees lens, divergence of beam angle is changed into respectively
δ, γ, to light, there is disperse function due to concavees lens it is known that, δ ＞ alpha, gamma ＞ β, thus realizing mixed mould and increasing the angle of divergence
Purpose it can be seen that, described device be conducive to increase beam divergence angle, it is obvious that it homogenizes the effect of hot spot.
Comparative example,
Optical patchcord used in this comparative example is circle in diameter, length and the material of cylindric optical fiber and embodiment 1
Column optical fiber is identical, and the light beam parameters of the laser light source being adopted are also identical with embodiment 1.
Spot pattern is recorded using ccd, the hot spot that homogenizes of optical fiber described in embodiment 1 and existing cylindric optical fiber is used as
Contrast test: Fig. 3 is the design sketch homogenizing hot spot to light beam for the optical fiber described in embodiment 1, and in Fig. 3, spot center speckle substantially subtracts
Few, hot spot becomes uniformly；And Fig. 4 to be comparative example state the design sketch homogenizing hot spot to light beam for the optical fiber, in Fig. 4, hot spot exists and dissipates in a large number
Speckle.
In sum, using the device prepared by the present invention compared with ordinary optic fibre transmitting beam, it is respond well to homogenize hot spot,
Beam divergence angle significantly increases.
Claims (5)
1. a kind of preparation method increasing output beam space divergence angle and homogenizing the device of hot spot, described increase output beam is empty
Between the angle of divergence and homogenize the optical fiber that the device of hot spot includes axially across sleeve, described sleeve go out light end be provided with described
The concavees lens that optical fiber coaxial is installed；The surface of described concavees lens is provided with anti-reflection film；Anti-reflection film and required transmission optical maser wavelength
It is adapted, the diameter of described concavees lens and sleeve diameter match, in order to make fiber end face and concavees lens concentric；Described optical fiber
A diameter of 100-1000 μm；The radius of curvature of described concavees lens is: 1-10mm；Described concavees lens concave surface is pasted with fiber end face
Close；It is characterized in that, this preparation method comprises the following steps that
(1) by optical fiber penetration protecting pipe, respectively expose one section of cylindric optical fiber at the two ends of protection pipe, optical fiber coating is gone
Remove；
(2) the above-mentioned cylindric optical fiber exposing is passed through in the union joint contact pin of encapsulating, expose the fore-end of optical fiber；
(3) encapsulating in union joint contact pin is solidified；
(4) after solidifying, the cylindrical fiber being exposed to outside union joint contact pin is removed, form fiber end face, fiber end face is entered
Row grinds, and obtains the optical flat vertical with fiber optic hub axle, makes optical patchcord；
(5) concavees lens are coaxially mounted in sleeve, by union joint contact pin from the insertion sleeve of sleeve one end, by concavees lens and company
Joint contact pin is close to and fixes；
(6), when using, the other end flange of described optical patchcord is connected with laser output and fixes.
2. the preparation method increasing output beam space divergence angle and homogenizing the device of hot spot according to claim 1, its
It is characterised by, described optical patchcord is st optical patchcord, fc optical patchcord or sma905 optical patchcord.
3. according to claim 1 preparation method it is characterised in that described concavees lens be one side concavees lens or two-sided concave saturating
Mirror.
4. preparation method according to claim 1 is axially opened it is characterised in that being provided with the described barrel of sleeve
Mouthful.
5. preparation method according to claim 4 is it is characterised in that described sleeve is metal sleeve or ceramic sleeve.
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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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| CN104516063B true CN104516063B (en) | 2017-02-01 |
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| 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 |
| CN111337901A (en) * | 2020-04-03 | 2020-06-26 | 深圳煜炜光学科技有限公司 | Laser radar for remote detection and detection method thereof |
| CN114253001A (en) * | 2021-12-27 | 2022-03-29 | 江苏大学 | Uniform light spot shaping system |
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| 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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| 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 |
| CN102436573B (en) * | 2011-07-15 | 2013-06-19 | 东莞市中控电子技术有限公司 | Image acquisition and recognition device with active lighting function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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