CN103837992A - Method for homogenizing and eliminating speckle of optical fiber output laser - Google Patents
Method for homogenizing and eliminating speckle of optical fiber output laser Download PDFInfo
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- CN103837992A CN103837992A CN201210482736.8A CN201210482736A CN103837992A CN 103837992 A CN103837992 A CN 103837992A CN 201210482736 A CN201210482736 A CN 201210482736A CN 103837992 A CN103837992 A CN 103837992A
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Abstract
The invention relates to a method for homogenizing and eliminating speckles of optical fiber output laser. The method comprises that an optical fiber output end surface or an optical fiber end cap output surface of an optical fiber output laser device are coarsened. The optical fiber output end surface arranged in an inserting core or the optical fiber end cap output surface is cleaned and then immersed in corrosive liquid in a suspended way, and corrosion time is 2-20min so that the obtained optical fiber output end surface is changed from a smooth surface to a coarsened surface. The laser device is electrified and the optical speckles are observed so that the homogenized laser beams have no dark heart, halo or electric torch phenomena.
Description
Technical field
A kind of method that the present invention relates to optical fiber Output of laser homogenising dissipation spot, belongs to laser application technique field.
Background technology
Laser has obtained application widely as a kind of high brightness, monochromaticity light source good, good directionality.Optical fiber output laser chip operation environmental sealing, ultra-clean, increases the service life, and optical fiber output provides soft client, easy to use and flexible.But couple light to multimode optical fiber due to what laser instrument sent, and after multimode optical fiber transmission, form a lot of patterns output, final output light is not uniform light beam, common there will be is circular, spiral fashion or asymmetric shape, between pattern and pattern, also exists and interferes, and causes the formation of speckle.In the time of illumination, the unevenness of this optical fiber output light field and interference speckle have a strong impact on the display effect of test side, also directly have influence on the quality of image in laser display system.
The system of the method for some homogenize light fields that exist is at present very complicated, cost is also higher, as Chinese patent document CN102169239A discloses the speckle image scramble in a kind of laser projection system, a kind of laser projection system is provided, and this laser projection system comprises light source, phase delay element and beam flying element.Light source comprises at least one frequency transformation lasing light emitter, and this lasing light emitter comprises wavelength tuneable laser diode and wavelength converter.Phase delay element is configured to the polarization of frequency transformation laser beam to resolve into two orthogonal line deviatoric components so that a polarized component lags behind with respect to another phase place.Frequency transformation Laser Beam Polarization in 2D picture frame is the function of the degree that relative to each other lags behind of each polarized component and changes with the wavelength variations in the output of wavelength tuneable laser diode.The polarization variations of the frequency transformation laser beam in 2D picture frame is enough to across 2D picture frame scramble Image Speckle pattern.But the device of this system is compact not, and components and parts are more, poor reliability.
Chinese patent document CN102081235A discloses the method for transmitting optical signal homogenising, depolarization and eliminating coherence in multimode optical fiber, the liquid that optical fiber is placed in to ultrasonic oscillator is realized the homogenize to hot spot, optical fiber by Optical Fiber Winding in oscillator limits in circle, and the liquid of employing is water.This device is relatively simple, but owing to there being the existence of liquid, uses very inconveniently, and ultrasonator needs plus high-pressure high frequency electric source, increased volume and the cost of whole system.
Chinese patent document CN201285473A discloses a kind of decohering and shimming device based on scattering, comprise hollow waveguide and scattering medium, the communication process of laser in scattering medium, by scattering medium to swashing scattering of light beam splitting utilize the mixed light effect of waveguide to carry out homogenize to laser.This device is relatively simple, but due to the absorption loss in scattering medium and waveguide reflection horizon, efficiency is not high, and the loss of luminous power is larger.
The described multimode optical fibers by certain length such as United States Patent (USP) 6532244,6810175 coil or apply distributed stress, and are aided with from axle coupling, by the method for the fiber alignment of different-diameter.But it is easy not that these methods implement, need device and sufficiently long optical fiber that volume ratio is larger, install, regulate all inconveniences, when batch making, consistance is difficult to guarantee.Chinese patent document CN101630045A provides a kind of device that improves spacial distribution of output beams of multimode fibers, by changing spacial distribution of output beams to optical fiber stress application, be included in transmission laser multimode optical fiber on very short length on apply single-point, multiple spot or continuous distribution external carbuncle, method is simple and convenient, there is obvious effect for the annulus barber-pole stripes in hot spot, but the method to the interference speckle in light field without any effect, in illumination, when demonstration, still can have a strong impact on the quality of imaging.
Summary of the invention
For the unevenness of prior art optical fiber output light field and the problem of interference speckle, the invention provides a kind of method of optical fiber Output of laser homogenising dissipation spot, the effect that can reach light spot homogenizing simultaneously and subdue speckle, meets the high-quality requirement of optical fiber Output of laser as light source.
Terminological interpretation:
Numerical aperture: the constant of optical fiber, relevant with optical fiber output light maximum diameter of hole, be the definition mode of an angle of divergence.The light that incides fiber end face can not all be transmitted by optical fiber, and just the incident light in certain angular range just can.The sine value of this angle [alpha] is just called the numerical aperture (NA=sin α) of optical fiber.
Optical fiber core diameter/covering: be the diameter of optical fiber inner core diameter and surrounding layer, for example, optical fiber core diameter/covering is 400/440 micron, refers to that optical fiber inner core diameter is 400 microns, 440 microns of cladding diameters.
Technical scheme of the present invention is as follows:
A method for optical fiber Output of laser homogenising dissipation spot, comprises that roughening treatment is carried out in fiber-optic output face or the output face of optical fiber end cap to optical fiber output laser, and step is as follows:
(1) clean
Fiber-optic output face is carried out to cleaning treatment, remove its surface contaminants; Optical fiber is fixed in optical fiber output laser connector lock pin, and fiber-optic output face is concordant with insertion core end face; Or,
By optical fiber end cap of fiber-optic output welding, the output face of cleaning optical fiber end cap, removes its surface contaminants;
(2) alligatoring
To be arranged in the fiber-optic output face of lock pin or the output face of optical fiber end cap be suspended and is immersed in corrosive liquid, etching time be 2 ~ 20min; Described corrosive liquid is that volume ratio is that HF and the water of 1:5 ~ 20 mixes; Gained fiber-optic output face becomes coarse surface from smooth flat; Taking-up is arranged in the optical fiber of lock pin, with deionized water rinsing fiber-optic output face;
(3) will be arranged in after the optical fiber roughening treatment of lock pin, or by after the optical fiber end cap roughening treatment of welding, to laser instrument energising, observe hot spot, obtain the Output of laser of homogenising.
Preferred according to the present invention, in above-mentioned steps (2), roughening treatment is that the lock pin that is fixed with optical fiber is immersed to the 3-6mm degree of depth in corrosive liquid; Or the optical fiber end cap of fiber-optic output welding is immersed to the 3-6mm degree of depth in corrosive liquid.
Preferred according to the present invention, described optical fiber or optical fiber end cap material are quartz material.Quartz material is subject to HF acid effect, and its travel path of end face surface texturing (as shown in Figure 2) is become in a jumble from the original directive property that has; The refraction of end face output light generation different angles, breaks the restriction that optical fiber mode fields forms light, realizes the homogenize of hot spot.
The laser beam of the inventive method gained homogenising is without the dark heart, without the ring of light with without electric torch phenomenon (as shown in Figure 5 b).
Preferred according to the present invention, described fiber lengths 20-60cm, optical fiber core diameter/covering is 400/440 micron, numerical aperture 0.22.
Preferred according to the present invention, described optical fiber end cap length is 5-20mm, and diameter is 1.5-5mm.The proportional assurance light of optical fiber end cap length and diameter is not in the output of the side of optical fiber end cap, and optical fiber end cap material is generally elected the medium that the transmittance such as quartz or glass is high as.
Preferred according to the present invention, described optical fiber output laser, output wavelength is 780-980nm.
Principle of the present invention is:
Carry out roughening treatment at fiber-optic output face, make originally to change in end in strict accordance with the beam Propagation path of inside of optical fibre mould field transmission, output light is at the exit facet of end process different angles, there is the refraction of different angles, break the restriction that optical fiber mode fields forms light, realize the homogenize of hot spot.And the method has realized the change of light path simultaneously, light is by different face output, and difference appears in light path, also can reduce the speckle causing because interfering, and further realizes light spot homogenizing.
Fig. 3 is that alligatoring fiber end face, light do not transmit schematic diagram in optical fiber, and light transmits according to total reflection rule in optical fiber, is subject to the impact of inside of optical fibre pattern, press inside of optical fibre pattern order output, cause output light hot spot orderly, form the orderly patterns such as annulus star graph, as shown in Fig. 5 b.
Fig. 4 is that fiber end face, the light after alligatoring transmits schematic diagram in optical fiber, light transmits according to total reflection rule in optical fiber, be subject to the impact of inside of optical fibre pattern, form difference with alligatoring not and carry out alligatoring at the end face of optical fiber, after alligatoring, light is upset original order output, form wide angle and export in a jumble, as shown in Fig. 5 a.Formed the even wide angle output of light through this alligatoring step.
The present invention is applicable to the light spot homogenizing of multimode optical fiber output laser, and the larger homogenize effect of fibre diameter size is better.Optical fiber is welded on glass optical fiber cap, optical fiber cap end face is carried out to alligatoring texturing, better effects if.
The inventive method is simple, cost is low, is applicable in the application take optical fiber Output of laser as light source, as laser night vision, security protection, laser projection etc.
Accompanying drawing explanation
Fig. 1 is the front fiber end face schematic diagram of alligatoring that is arranged in lock pin;
Fig. 2 is arranged in fiber end face schematic diagram after the alligatoring of lock pin;
Fig. 3 is light output fiber end view before alligatoring;
Fig. 4 is light output fiber end view after alligatoring;
Fig. 5 is that the hot spot of laser fiber Output of laser before and after fiber end face alligatoring changes schematic diagram.
Fig. 6 is fiber-optic output welding optic fibre end cap schematic diagram.
In figure: 1, optical fiber; 2, lock pin; 3, fiber end face after alligatoring; 4, light; 5, fiber end face before alligatoring; 6, optical fiber end cap.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described, but be not limited to this.
Embodiment 1: a kind of method of optical fiber Output of laser homogenising dissipation spot, step is as follows:
(1) 2W optical fiber output laser, the optical fiber of quartz material is fixed in optical fiber output laser connector lock pin, and fiber-optic output face is concordant with insertion core end face; Fiber lengths 20cm, generally affected by inside of optical fibre pattern more serious for the shorter light of optical fiber, fibre diameter 400/440, numerical aperture 0.22, output wavelength 808nm, both positive and negative polarity energising 2A observes hot spot; Hot spot is affected by multimode optical fiber internal schema, inhomogeneous in space distribution, occurs the dark heart and electric torch phenomenon, as shown in Figure 5 a;
Turn off power supply, take out and clear up fiber-optic output face, remove surface contaminants.As shown in Figure 1, optical fiber 1 is arranged in lock pin 2, is alligatoring fiber end face not, and now optical fiber 1 end face is concordant with insertion core end face, and output surface is smooth, approximately has 0.05 micron of polishing;
(2) dose volume is than HF and water hybrid corrosion liquid for 1:10;
The fiber-optic output face that is arranged in lock pin is suspended in to the corrosive liquid configuring, lock pin immersed in liquid level degree of depth 6mm, corrosion 10min takes out; Fiber optic materials is quartz, is subject to HF acid effect, fiber-optic output face surface texturing, and as shown in Figure 2, fiber end face 3 is surface after corrosion;
With deionized water rinsing fiber-optic output face.In the whole process of this step, note avoiding the corrosion injury of solution;
Fiber end face microstructure is illustrated as Fig. 4, surface texturing, and its travel path is become in a jumble from the original directive property that has;
(3) give laser instrument both positive and negative polarity energising 2A, observe hot spot.Hot spot changes into shown in Fig. 5 b from becoming shown in Fig. 5 a; Obtain the Output of laser of homogenising.
Embodiment 2:
Optical fiber output laser, is not with connector, bare fibre output.Optical fiber 1 output terminal is fused on optical fiber end cap 6, and optical fiber end cap 6 is quartz columns that diameter is greater than optical fiber, adopts optical fiber end cap 6 one end of 1.8mm diameter to be fused on optical fiber 1, and the other end is ground, and the length of optical fiber end cap 6 is 8mm.As shown in Figure 6.
(1) cleaning optical fiber end cap 6 output faces, remove surface contaminants;
(2) preparation corrosive liquid, the HF that is 1:10 according to volume ratio and water mix; Optical fiber end cap is suspended in the solution configuring, under optical fiber end cap immersion etching fluid, 3mm is dark, and corrosion 10min takes out optical fiber end cap; Optical fiber end cap material is quartz, is subject to HF acid effect, surface texturing; With deionized water rinsing optical fiber end cap, the whole process of contact solution is noted the corrosion injury of solution to human body; Fiber end face microstructure is illustrated as Fig. 4, surface texturing, and its travel path is become in a jumble from the original directive property that has;
(3) laser instrument both positive and negative polarity energising 2A, observes hot spot, as shown in Figure 5 b.Obtain the Output of laser of homogenising.
Claims (6)
1. a method for optical fiber Output of laser homogenising dissipation spot, comprises that roughening treatment is carried out in fiber-optic output face or the output face of optical fiber end cap to optical fiber output laser, and step is as follows:
(1) clean
Fiber-optic output face is carried out to cleaning treatment, remove its surface contaminants; Optical fiber is fixed in optical fiber output laser connector lock pin, and fiber-optic output face is concordant with insertion core end face; Or,
By optical fiber end cap of fiber-optic output welding, the output face of cleaning optical fiber end cap, removes its surface contaminants;
(2) alligatoring
To be arranged in the fiber-optic output face of lock pin or the output face of optical fiber end cap be suspended and is immersed in corrosive liquid, etching time be 2 ~ 20min; Described corrosive liquid is that volume ratio is that HF and the water of 1:5 ~ 20 mixes; Gained fiber-optic output face becomes coarse surface from smooth flat; Taking-up is arranged in the optical fiber of lock pin, with deionized water rinsing fiber-optic output face;
(3) will be arranged in after the optical fiber roughening treatment of lock pin, or by after the optical fiber end cap roughening treatment of welding, to laser instrument energising, observe hot spot, obtain the Output of laser of homogenising.
2. the method for optical fiber Output of laser homogenising dissipation spot as claimed in claim 1, is characterized in that in step (2), roughening treatment is that the lock pin that is fixed with optical fiber is immersed to the 3-6mm degree of depth in corrosive liquid; Or the optical fiber end cap of fiber-optic output welding is immersed to the 3-6mm degree of depth in corrosive liquid.
3. the method for optical fiber Output of laser homogenising dissipation spot as claimed in claim 1, is characterized in that described optical fiber or optical fiber end cap material are quartz material.
4. the method for optical fiber Output of laser homogenising dissipation spot as claimed in claim 1, is characterized in that described fiber lengths 20-60cm, and optical fiber core diameter/covering is 400/440 micron, numerical aperture 0.22.
5. the method for optical fiber Output of laser homogenising dissipation spot as claimed in claim 1, is characterized in that described optical fiber end cap length is 5-20mm, and diameter is 1.5-5mm.
6. the method for optical fiber Output of laser homogenising dissipation spot as claimed in claim 1, is characterized in that described optical fiber output laser, and output wavelength is 780-980nm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113463061A (en) * | 2021-06-24 | 2021-10-01 | 中国科学院合肥物质科学研究院 | Processing method of light spot sampling optical fiber |
| CN114325941A (en) * | 2020-09-28 | 2022-04-12 | 潍坊华光光电子有限公司 | Method for homogenizing light spots on end face of laser etching optical fiber |
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2012
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| JPH04218002A (en) * | 1990-03-07 | 1992-08-07 | Health Res Inc | Optical fiber diffusing device and manufacture thereof and composition used in optical fiber diffusing device |
| EP1586386A1 (en) * | 2002-12-03 | 2005-10-19 | Nikon Corporation | Contaminant removing method and device, and exposure method and apparatus |
| US20090238215A1 (en) * | 2004-08-25 | 2009-09-24 | Koheras A/S | Method Of Inducing Refractive Index Structures In A Micro-Structured Fiber, A Micro-Structured Fiber And An Article |
| GB2431729A (en) * | 2005-10-29 | 2007-05-02 | Gsi Group Ltd | Optical fibre coupling structure with wedge shaped end |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325941A (en) * | 2020-09-28 | 2022-04-12 | 潍坊华光光电子有限公司 | Method for homogenizing light spots on end face of laser etching optical fiber |
| CN114325941B (en) * | 2020-09-28 | 2024-02-06 | 潍坊华光光电子有限公司 | Method for homogenizing light spots by laser etching of fiber end face |
| CN113463061A (en) * | 2021-06-24 | 2021-10-01 | 中国科学院合肥物质科学研究院 | Processing method of light spot sampling optical fiber |
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Address after: Tianchen Avenue high tech Zone of Ji'nan City, Shandong Province, No. 1835 250101 Patentee after: SHANDONG HUAGUANG OPTOELECTRONICS CO., LTD. Address before: Tianchen Avenue high tech Zone of Ji'nan City, Shandong Province, No. 1835 250101 Patentee before: Shandong Huaguang Photoelectronic Co., Ltd. |