CN1553240A - Method for changing light parameter product of collimated light beam by using reflector stack - Google Patents
Method for changing light parameter product of collimated light beam by using reflector stack Download PDFInfo
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- CN1553240A CN1553240A CNA031235689A CN03123568A CN1553240A CN 1553240 A CN1553240 A CN 1553240A CN A031235689 A CNA031235689 A CN A031235689A CN 03123568 A CN03123568 A CN 03123568A CN 1553240 A CN1553240 A CN 1553240A
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Abstract
The method for changing the optical parameter product of collimated light beam by using reflector stack adopts two reflector stacks arranged according to a certain rule as reflecting carrier, and changes the optical parameter product of light beam by twice reflection, and rearranges the light beam to achieve the rotational symmetry of light beam. The invention has the advantages of less reflection times, small light beam shaping dispersion, simple structure, convenience and practicability.
Description
Technical field
The present invention relates to a kind of method of utilizing the reflecting optics heap to change the collimated light beam beam parameter product, belong to optical fiber coupling field.
Background technology
Beam parameter product is an important indicator weighing laser beam.Beam parameter product, the i.e. product of the beam diameter of laser and its far-field divergence angle.When laser beam was transmitted in same medium or general optical system, the beam parameter product of light beam was constant.It is such as in the laser beam optical fiber coupling a key factor should considering.
In the coupling of laser beam optical fiber, if only light beam is collimated, focuses on, the beam parameter product of laser beam is constant in the ideally whole process.Certainly the beam parameter product of light beam can be represented condenser lens numerical aperture NA with another constant after the light beam line focus lens focus
LensProduct (condenser lens numerical aperture NA with the focal beam spot diameter
LensCorresponding to the angle of divergence of light beam in the beam parameter product, the focal beam spot diameter is corresponding to beam diameter in the beam parameter product).And in the optical fiber coupling, to obtain high coupling efficiency, and the numerical aperture of coupling output optical fibre should be greater than the numerical aperture of focusing objective len, and the optical fiber core diameter should be greater than focused spot size simultaneously.Therefore in theory, coupling output optical fibre core diameter and numerical aperture are limited, but under the certain situation of laser beam coupling output power, the optical fiber core diameter and the numerical aperture of wishing coupling are as much as possible little, just can obtain high-brightness laser output, this just contradicts with the requirement to optical fiber core diameter and numerical aperture of high coupling efficiency.In order to solve the contradiction of high coupling efficiency and high brightness laser output, need carry out shaping to laser beam.So-called shaping is cut into many sections to coupled light beam (as linear beam) exactly, rearranges into certain shape such as rectangle, and is square etc.With this beam parameter product that improves it, make itself and littler core diameter, more small value aperture optical fiber coupling reaches best coupling efficiency, obtains high-brightness laser.
The method of existing beam shaping mainly contains: refraction shaping method and catadioptric are in conjunction with the shaping method.
Refraction shaping method is according to refraction principle, and light beam incides in the transparent medium (as glass etc.) with certain angle, and direction will change.If this medium is parallel medium, it is constant that light beam passes the direction of propagation, back, but the position will be moved in the plane of incidence.Different amount of movements can be controlled by the thickness of different incident angles and medium.Adopt the multi-layer transparent medium can realize the rearrangement of light beam, thereby reach the purpose of beam shaping.Wuhan this way that photoelectricity company limited just is to use of reaching the clouds.What also have directly utilizes the prism beam-expanded or bundle that contracts of Brewster angle.
Catadioptric generally is to utilize the hypotenuse of an isosceles right-angle prism as plane of refraction in conjunction with the shaping method, and two right-angle sides are placed the rearrangement of finishing light beam by two stair-stepping edge glass stacks by certain position as reflecting surface, thereby reach the purpose of shaping.
Above-mentioned two kinds of methods are because because the number of times of the refraction of process and reflection is more, under the relatively poor situation of beam collimation degree, light beam through repeatedly reflect and reflect after can disperse come, the size of the light beam after the shaping can collimate the size of the light beam rearrangement under the situation much larger than height, cause the coupling efficiency of optical fiber low, the brightness of laser output reduces.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art and a kind of simple, practical method of utilizing the reflecting optics heap to change the collimated light beam beam parameter product is provided, this method reaches the shaping of light beam by the reflection of two mirror stack reflectings surface, reduce light beam and owed to collimate the disperse of light beam after the shaping under the situation, improve the coupling efficiency of little core diameter small value aperture optical fiber, obtained high-brightness laser output.
Technical solution of the present invention is: utilize the reflecting optics heap to change the method for collimated light beam beam parameter product, it is characterized in that: adopt two to press certain regularly arranged mirror stack as the reflection carrier, by two secondary reflections, beam parameter product change with light beam, and light beam rearranged, specifically comprise the following steps:
(1) requires to select the reflecting surface thickness of each mirror stack at the characteristic of light beam and different beam shapings;
(2) determine the queueing discipline of each mirror stack reflecting surface according to the reflecting surface thickness of each mirror stack, or reflecting surface is directly processed on an element as a mirror stack.
(3) two mirror stacks are positioned in the shaping light path by rule, light beam is collimated.
The reflecting surface thickness of catoptron is selected by beam sizes in the described step (1), it all is for asymmetric being shaped as the rotation symmetrical beam that general shaping requires, so follow following principle when selecting thickness: the reflecting surface thickness of each catoptron equates in each mirror stack, second thickness that each mirror reflects face thickness of mirror stack is the narrower direction place of light beam wherein, each mirror reflects face thickness of first mirror stack is the thickness wanting after the place's shaping of narrower direction to reach (with after the shaping approaching more good more than cross direction place thickness).
Determine that according to the reflecting surface thickness of each mirror stack the queueing discipline of each mirror stack reflecting surface is meant in the described step (2), after processing desired two kinds of catoptrons, two mirror stacks are that the dual-side with each mirror reflection surface sticks together mutually, form stair-stepping mirror stack; Interval between each mirror reflection surface of two mirror stacks is the thickness of each mirror reflection surface of the other side each other, that is to say for the thickness that is spaced apart second each mirror reflection surface of mirror stack between each mirror reflection surface of first mirror stack; The thickness that is spaced apart first each mirror reflection surface of mirror stack between second each mirror reflection surface of mirror stack.
Also each mirror stack can be machined directly to an integral body in the above-mentioned steps (2), and need not be with each mirror stack in the method for paste with several reflector group altogether.Can save the trouble of stickup like this.But mirror stack is done as a whole bad processing, so adopted first machined mirrors to be pasted together the method that forms mirror stack again.
The catoptron of above-mentioned indication is prism or catoptron with this reflecting surface feature.
Thereby reach the rearrangement of light beam by the reflection of these two mirror stack reflectings surface, also just realized the purpose of beam shaping.
The present invention has following advantage than prior art: existing shaping methods is because the number of times of the refraction of process and reflection is more, under the relatively poor situation of beam collimation degree, light beam through repeatedly reflect and reflect after can disperse come, the size of the light beam after the shaping can collimate the size of the light beam rearrangement under the situation much larger than height; And the present invention has just just reached light beam through two secondary reflections the effect of shaping, thereby can reduce light beam greatly and owe to collimate the disperse of light beam after the shaping under the situation, improve the coupling efficiency of little core diameter small value aperture optical fiber so greatly, thereby obtained high-brightness laser output.
Description of drawings
Fig. 1 is the used catoptron synoptic diagram of first mirror stack in the embodiment of the invention;
Fig. 2 is second catoptron synoptic diagram that mirror stack is used in the embodiment of the invention;
Fig. 3 is the structural representation of first mirror stack in the embodiment of the invention;
Fig. 4 is the structural representation of second mirror stack in the embodiment of the invention;
Fig. 5 is the position and the light path synoptic diagram of two mirror stacks in the embodiment of the invention;
Fig. 6 (a) and Fig. 6 (b) are reflection shaping method demonstration graph in the embodiment of the invention, and wherein Fig. 6 (a) is through the light beam after oppositely for the first time, and Fig. 6 (b) is for through the light beam after the reflection for the second time.
Embodiment
Example of the present invention is to the wide 1mm of being, the example that length is carried out shaping for the light beam of 12mm, and its concrete steps are as follows:
The first step, according to shown in Figure 1, the purpose according to the shaping light beam is shaped as 3mm * 4mm with light beam by 1mm * 12mm in advance, makes light beam near the rotation symmetry.At first light beam is cut into 4 sections, then the thickness of first catoptron (present embodiment employing prism) is light beam than the length 12mm at length direction place divided by the merchant who cuts after several 4, i.e. 3mm.Owing to will make light beam directly over the vertical directive in reflection back on the hypotenuse, hypotenuse and the angle of right-angle side be set to 45 °.In order to reduce energy loss, generally on reflecting surface, plate the anti-film that increases at 45 ° of directions of shaping light beam wavelength;
In second step, according to shown in Figure 2, according to the size of shaping light beam, it is consistent that the reflecting surface width of second mirror stack (prism) and width of light beam are set to, i.e. 1mm.Since to make under the light beam of incident after hypotenuse reflection, penetrate by horizontal direction again, so limit, reflecting surface place and base angle are set to 135 °.In order to reduce energy loss, generally on reflecting surface, plate the anti-film that increases at 45 ° of directions of shaping light beam wavelength;
In the 3rd step, according to shown in Figure 3, the spacing of catoptron among Fig. 1 (prism) is set to 1mm and is pasted, as first mirror stack;
In the 4th step, according to shown in Figure 4, the catoptron among Fig. 2 (prism) is set to 3mm by spacing and is pasted, as second mirror stack;
The 5th step, according to shown in Figure 5, the edge glass stack quadrature among Fig. 3 and Fig. 4 is placed, the edge glass stack of Fig. 3 is placed over against light beam, the edge glass stack of Fig. 4 be placed on Fig. 3 edge glass stack directly over;
The 6th step, according to shown in Figure 6, light beam has been divided into 4 sections after by first mirror stack, through behind second mirror stack every section be rotated 90 ° and closely arrange, light beam becomes 3 * 4 by original 1 * 12, beam parameter product with light beam has rotated symmetrization like this, thereby can couple the beam in the optical fiber of littler core diameter and numerical aperture.
Claims (7)
1, utilize the reflecting optics heap to change the method for collimated light beam beam parameter product, it is characterized in that: adopt two to press certain regularly arranged mirror stack as the reflection carrier, by two secondary reflections, with the beam parameter product change of light beam, and light beam rearranged, specifically comprise the following steps:
(1) requires to select the reflecting surface thickness of each mirror stack at the characteristic of light beam and different beam shapings;
(2) determine the queueing discipline of each mirror stack reflecting surface according to the reflecting surface thickness of each mirror stack, or reflecting surface is directly processed on an element as a mirror stack.
(3) two mirror stacks are positioned in the shaping light path by rule, light beam is collimated.
2, the method for utilizing the reflecting optics heap to change the collimated light beam beam parameter product according to claim 1, it is characterized in that: the reflecting surface thickness of catoptron is selected by beam sizes in the described step (1), the reflecting surface thickness of each catoptron equates in each mirror stack, second thickness that each mirror reflects face thickness of mirror stack is the narrower direction place of light beam wherein, the thickness of each mirror reflects face thickness of first mirror stack for wanting after the place's shaping of narrower direction to reach.
3, the method for utilizing the reflecting optics heap to change the collimated light beam beam parameter product according to claim 1, it is characterized in that: determine that according to the reflecting surface thickness of each mirror stack the queueing discipline of each mirror stack reflecting surface is meant in the described step (2), after processing desired two kinds of catoptrons, two mirror stacks are that the dual-side with each mirror reflection surface sticks together mutually, form stair-stepping mirror stack; Interval between each mirror reflection surface of two mirror stacks is the thickness of each mirror reflection surface of the other side each other, that is to say for the thickness that is spaced apart second each mirror reflection surface of mirror stack between each mirror reflection surface of first mirror stack; The thickness that is spaced apart first each mirror reflection surface of mirror stack between second each mirror reflection surface of mirror stack.
4, the method for utilizing the reflecting optics heap to change the collimated light beam beam parameter product according to claim 1 is characterized in that: in the step (2) each mirror stack is machined directly to an integral body and is meant that the first machined mirrors of employing is pasted together the formation mirror stack again.
5, the method for utilizing the reflecting optics heap to change the collimated light beam beam parameter product according to claim 1, it is characterized in that: in the described step (1) two mirror stacks are positioned in the shaping light path by rule, be meant by the perpendicular quadrature rule to be positioned in the shaping light path, light beam is carried out shaping.
6, the method for utilizing reflecting optics heap to change the collimated light beam beam parameter product according to claim 1 is characterized in that: described catoptron is prism or catoptron with this reflecting surface feature.
7, the method for utilizing the reflecting optics heap to change the collimated light beam beam parameter product according to claim 1, it is characterized in that: described reflecting surface also plates the anti-film that increases at 45 ° of directions of shaping light beam wavelength.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031235689A CN1553240A (en) | 2003-05-29 | 2003-05-29 | Method for changing light parameter product of collimated light beam by using reflector stack |
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| CNA031235689A CN1553240A (en) | 2003-05-29 | 2003-05-29 | Method for changing light parameter product of collimated light beam by using reflector stack |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162925A (en) * | 2011-05-23 | 2011-08-24 | 中国科学院光电技术研究所 | Light beam shaping device |
| CN102520523A (en) * | 2011-12-20 | 2012-06-27 | 西安炬光科技有限公司 | Method for cutting and rearranging beams of semiconductor laser and beam coupling system for semiconductor laser |
| CN104583827A (en) * | 2012-08-29 | 2015-04-29 | 株式会社藤仓 | Light guiding device, method for producing same, and ld module |
| CN105589141A (en) * | 2016-03-04 | 2016-05-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| US9774171B2 (en) | 2012-12-27 | 2017-09-26 | Fujikura Ltd. | Multiplexer, multiplexing method, and LD module using outside-reflecting double mirrors |
| CN107771299A (en) * | 2015-06-23 | 2018-03-06 | 特拉迪欧德公司 | Optical element for changing the Beam parameter product in laser delivery systems is arranged |
| CN108020912A (en) * | 2016-11-03 | 2018-05-11 | 江苏艾洛维显示科技股份有限公司 | A kind of laser pack secondary reflection structure |
| US10185103B2 (en) | 2016-03-04 | 2019-01-22 | Hisense Broadband Multimedia Technologies Co., Ltd. | Optical module |
-
2003
- 2003-05-29 CN CNA031235689A patent/CN1553240A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162925A (en) * | 2011-05-23 | 2011-08-24 | 中国科学院光电技术研究所 | Light beam shaping device |
| CN102520523A (en) * | 2011-12-20 | 2012-06-27 | 西安炬光科技有限公司 | Method for cutting and rearranging beams of semiconductor laser and beam coupling system for semiconductor laser |
| CN102520523B (en) * | 2011-12-20 | 2014-05-07 | 西安炬光科技有限公司 | Method for cutting and rearranging beams of semiconductor laser and beam coupling system for semiconductor laser |
| CN104583827B (en) * | 2012-08-29 | 2017-06-16 | 株式会社藤仓 | Guiding device, manufacture method and LD modules |
| US9645389B2 (en) | 2012-08-29 | 2017-05-09 | Fujikura Ltd. | Light guiding device, method for producing same, and LD module |
| CN104583827A (en) * | 2012-08-29 | 2015-04-29 | 株式会社藤仓 | Light guiding device, method for producing same, and ld module |
| US9774171B2 (en) | 2012-12-27 | 2017-09-26 | Fujikura Ltd. | Multiplexer, multiplexing method, and LD module using outside-reflecting double mirrors |
| CN107771299A (en) * | 2015-06-23 | 2018-03-06 | 特拉迪欧德公司 | Optical element for changing the Beam parameter product in laser delivery systems is arranged |
| CN107771299B (en) * | 2015-06-23 | 2021-11-19 | 特拉迪欧德公司 | Optical element arrangement for changing beam parameter product in laser delivery system |
| CN105589141A (en) * | 2016-03-04 | 2016-05-18 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN105589141B (en) * | 2016-03-04 | 2018-01-09 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| US10185103B2 (en) | 2016-03-04 | 2019-01-22 | Hisense Broadband Multimedia Technologies Co., Ltd. | Optical module |
| US10678003B2 (en) | 2016-03-04 | 2020-06-09 | Hisense Broadband Multimedia Technologies Co., Ltd. | Optical module |
| CN108020912A (en) * | 2016-11-03 | 2018-05-11 | 江苏艾洛维显示科技股份有限公司 | A kind of laser pack secondary reflection structure |
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