CN202267786U

CN202267786U - Reflectivity-variable laser beam splitter

Info

Publication number: CN202267786U
Application number: CN2011203836727U
Authority: CN
Inventors: 洪顺坤; 张剑飞; 崔凯; 张严吾; 胡峰; 黄宏启
Original assignee: ANHUI BAOLONG ENVIRONMENT PROTECTION SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: ANHUI BAOLONG ENVIRONMENT PROTECTION SCIENCE AND TECHNOLOGY Co Ltd
Priority date: 2011-10-11
Filing date: 2011-10-11
Publication date: 2012-06-06
Anticipated expiration: 2021-10-11

Abstract

The utility model relates to a reflectivity-variable laser beam splitter, which comprises a laser, a beam-expanded telescope system, a first reflecting mirror, a second reflecting mirror and a third reflecting mirror, wherein a half-wave plate is respectively inserted between the first reflecting mirror and the second reflecting mirror as well as between the second reflecting mirror and the third reflecting mirror. Light intensities of three paths of reflecting light can be respectively adjusted by adjusting an included angle between the first reflecting mirror and incident polarized light and adjusting optical axis directions of the first half-wave plate and the second half-wave plate. The reflectivity-variable laser beam splitter disclosed by the utility model has the advantages that: a special beam splitter is not required, and the reflectivity-variable laser beam splitter can be suitable for different wavelengths of the lasers; and reflectivity-variable laser beam splitter can be used for carrying out beam splitting on laser with large light beam diameter (reaching tens of millimeters) and high power.

Description

A kind of variable reflectivity laser light-dividing device

Technical field

The utility model belongs to laser technology field, is specifically related to a kind of laser light-dividing device of variable reflectivity.

Background technology

Traditional laser beam split mode has two kinds; A kind of is can adopt the fiber optic splitter beam split to fiber laser; Other non-fiber lasers adopt the beam split of plated film reflector plate, and two kinds of beam split modes all can only be by set reflectivity beam split, and reflectivity is immutable in application process.

Along with popularizing of semiconductor laser product and application technology; Increasing optical detection apparatus has adopted the penetrability detection light source of laser as medium; In order to reduce cost, the beam of laser that laser instrument sends is divided into multichannel output usually, and what have needs reflectivity adjustable; To realize that multichannel detects simultaneously, to reach reducing the purpose that detects cost.For the laser beam split of fiber laser output, can adopt the mode of fiber optic splitter.Yet beam splitter is also powerless during the bigger laser beam light splitting of non-fiber laser and beam diameter, power, need adopt a plurality of reflector plate beam split in this case.Because light intensity all can have decay behind the light beam per pass reflector plate; Through the transmitted light intensity behind the higher order reflection sheet more and more a little less than, be to guarantee the output intensity of higher order reflection, need the reflectance coating of plating different reflectivity; Yet this reflectance coating technology only can be applicable to the beam split of monochromatic light road; The multiple different reflectivity that needs for the multichannel beam split can't guarantee on coating process, the more important thing is that the splitting ratio of fiber optic splitter and plated film reflector plate is fixed, and can not accomplish that reflectivity is adjustable.

Summary of the invention

The purpose of the utility model provides a kind of laser light-dividing device of variable reflectivity.

The technical solution that the utility model adopted is following:

Have according to the physical optics principle:

1, a branch of light incides dielectric surface; When the plane of polarization of light beam is vertical with the plane of incidence (plane that incident ray and reflection ray constitute); Reflective light intensity is maximum, and transmitted light intensity is minimum, when the light beam polarization face is parallel with the plane of incidence; Reflective light intensity is minimum, and transmitted light intensity maximum (Ma Pusi law) is seen Fig. 1.

2, a branch of polarized light is through behind the half-wave plate, and emergent light still is a polarized light, but plane of polarization has rotated 2 θ angles (θ: the angle of half-wave plate optical axis direction and incident light polarization direction) before with respect to incident.

The core technology of the utility model is:

A kind of variable reflectivity laser light-dividing device; Comprise laser instrument 1, beam expanding telescope system 12, first catoptron 2, second catoptron 4, the 3rd catoptron 6; Between first catoptron 2 and second catoptron 4, insert first half-wave plate 3, between second catoptron 4 and the 3rd catoptron 6, insert second half-wave plate 5; The optical axis direction of first catoptron 2, second catoptron 4, the 3rd catoptron 6, first half-wave plate 3, second half-wave plate 5 is all adjustable.

N catoptron and (N-1) individual half-wave plate can be set in the light path of said variable reflectivity laser light-dividing device, be extended to and have N road catoptrical variable reflectivity laser light-dividing device, wherein N is a positive integer.

The good effect of the utility model is:

The utility model has been compared following advantage with the method for existing multi-path laser beam splitter beam split:

1. do not need special-purpose beam splitter, can be adapted to various different wavelength of laser devices;

2. can be to big beam diameter (reaching tens of mm) and powerful laser beam splitter, this is that beam splitter institute is irrealizable;

3. the output intensities at different levels of beam splitting system can be variable as required.

Description of drawings

Fig. 1 is the polarized light synoptic diagram of the utility model emission and refraction.

Fig. 2 is the utility model optical structure chart.

Fig. 3 is an embodiment polarization direction of the utility model figure.

Embodiment

Embodiment one

Said device is seen Fig. 2: one minute three beam splitting system of a 532nm laser; Produce the laser of a branch of wavelength 532nm, the about 2mm of beam diameter by laser instrument 1; Through a beam expanding telescope system 12 is the collimated light of diameter 20mm with beam spread; At first adjust laser instrument 1; Make and the polarization direction of polarized incident light 7 and the plane of incidence angle less relatively (for the light intensity after the level decay of back can promote through the direction of regulating the wave plate polarization) of first catoptron 2, obtain first via reflected light 8 by 2 reflections of first catoptron; Transmitted light 9 through first catoptron 2 passes first half-wave plate, 3 arrival, second catoptron 4, regulates the optical axis direction of first half-wave plate 3, makes the reflective light intensity of the second road reflected light 10 equal the light intensity of first via reflected light 8; Transmitted light through second catoptron 4 passes second half-wave plate, 5 arrival the 3rd catoptron 6, regulates the optical axis direction of second half-wave plate 5, makes the reflective light intensity of Third Road reflected light 11 equal the light intensity of first via reflected light 8; We have just obtained the variable beam split of 3 bundle light intensity like this, and the rest may be inferred can obtain the variable beam splitting system of more light intensity.

Embodiment two

Fig. 3 is the polarization direction figure of the device of a practical application, and 45 ° of incident laser polarization direction and plane of incidence angles obtain the first reflective light intensity 2mw; Adjust the optical axis direction of first half-wave plate; Make second reflective light intensity also equal 2mw; The laser polarization direction of second catoptron is injected in measurement and the angle of the plane of incidence is about 60 °; Adjust the optical axis direction of second half-wave plate, make the 3rd reflective light intensity also equal 2mw, the laser polarization direction of the 3rd catoptron is injected in measurement and the angle of the plane of incidence is about 80 °.

Claims

1. variable reflectivity laser light-dividing device; Comprise laser instrument (1), beam expanding telescope system (12), first catoptron (2), second catoptron (4), the 3rd catoptron (6); It is characterized in that: between first catoptron (2) and second catoptron (4), insert first half-wave plate (3), between second catoptron (4) and the 3rd catoptron (6), insert second half-wave plate (5); The optical axis direction of first catoptron (2), second catoptron (4), the 3rd catoptron (6), first half-wave plate (3), second half-wave plate (5) is all adjustable.

2. a kind of variable reflectivity laser light-dividing device according to claim 1; It is characterized in that: N catoptron and (N-1) individual half-wave plate can be set in the light path of said variable reflectivity laser light-dividing device; Be extended to and have N road catoptrical variable reflectivity laser light-dividing device, wherein N is a positive integer.