CN203365808U

CN203365808U - Sheet-type isolator

Info

Publication number: CN203365808U
Application number: CN 201320418145
Authority: CN
Inventors: 肖志全; 张勇
Original assignee: UNION OPTIC Inc
Current assignee: UNION OPTIC Inc
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2013-12-25
Anticipated expiration: 2023-07-15

Abstract

The utility model provides a sheet-type isolator which is capable of realizing the echo isolation of the light beam having a large numerical aperture. The sheet-type isolator comprises a 1/4 zero-order wave plate. The wave plate comprises an optical glass, a wire grid polarizer and a quartz crystal which are glued together successively. The outer surface of the optical glass and the outer surface of the quartz crystal are plated with a reflection reducing layer respectively. The direction of the optical axis of the quartz crystal is located in a light-passing surface, and formed an included angle of 45 degrees with the direction of the wire grid. According to the sheet-type isolator of the utility model, the optical axis of the wave plate is parallel to the surface of the wave plate, and forms an included angle of 45 degrees with the wire grid, the outgoing surface of the wave plate is plated with a reflection reducing film, and when the device behind the wave plate has the strong reflection performance, 1/2 phase delay will be generated after light passes through the wave plate twice, and the light is absorbed and reflected on the wire grid plate, so the protection of a light source can be realized.

Description

The sheet type isolator

Technical field

The utility model relates to a kind of optical device, especially a kind of sheet type isolator.

Background technology

In some optical instrument; often can use uncollimated rays and measure and analyze, its angle of divergence is usually larger, also needs the light path of the Lights section and part of detecting is realized to effectively isolation simultaneously; because the secondary hot spot of reflection fluctuates to producing, improve the stability of equipment to reduce light source.Design because the normal optical isolator is generally the solution collimated light path, can be difficult to be competent in uncollimated light path, when larger numerical aperture application, throughput descends, and isolating power descends.

The utility model content

The purpose of this utility model is to provide a kind of sheet type isolator that can realize the echo isolation of bigger numerical aperture light beam.

Realize the sheet type isolator of the utility model purpose, comprise 1/4 zero-th order waveplates, described wave plate comprises optical glass glued together successively, wire grid polarizer and quartz crystal; The outside surface of described optical glass and quartz crystal is coated with respectively anti-reflection layer; The optical axis direction of described quartz crystal is positioned at logical light face, and with the direction of wiregrating in angle of 45 degrees.

The beneficial effects of the utility model are as follows: sheet type isolator of the present utility model; the optical axis of wave plate is parallel to the wave plate surface; and with wiregrating in angle of 45 degrees; the exit facet of wave plate is coated with antireflecting film; when the later device of wave plate has than strong reflection; can produce 1/2 phase delay twice after wave plate, be absorbed on the wiregrating sheet or reflect, can realize the protection to light source.

Wire grid polarizer is a kind of polarizer that can use at wide spectral range, can under larger numerical aperture condition, as polarizer, use, adopting optical glass is also a kind of Polarization Modulation element that can use under larger incident angle condition as the Quartz Crystal Wave Plates of substrate, for the solution light isolating problem in collimated light path by no means, the utility model adopts wire grid polarizer and true zero-th order waveplates combination, can realize the echo isolation of the light beam of bigger numerical aperture.

The accompanying drawing explanation

The structural representation that Fig. 1 is sheet type isolator of the present utility model.

Embodiment

Embodiment of the present utility model is as follows: as shown in Figure 1, sheet type isolator of the present utility model, comprise 1/4 zero-th order waveplates, and described wave plate comprises optical glass glued together successively 1, wire grid polarizer 2 and quartz crystal 3; The outside surface of described optical glass 1 and quartz crystal 3 is coated with respectively anti-reflection layer 4; The optical axis direction of described quartz crystal 3 is positioned at logical light face, and with the direction of wiregrating in angle of 45 degrees.

Principle of work of the present utility model is as follows: light that light source sends arrives wire grid polarizer, this one of them polarization state of wire grid polarizer strong absorption, and the polarization state that finally only allows vibration plane wherein to be parallel to wiregrating sees through; 1/4 zero-th order waveplates is that quartz crystal directly is glued on wire grid polarizer and processes, the optical axis of crystal and the angle of wiregrating are 45 degree, can make linearly polarized light produce 1/4 wavelength phase delay and be transformed into circularly polarized light, the exit facet of wave plate is coated with antireflecting film, to reduce follow-up light energy losses.

Birefringence effect due to wave plate, the generation pi/2 phase postpones, make the light beam through the wave plate outgoing become circularly polarized light, this circularly polarized light is at the device surface reflex time by follow-up, the rotation direction of the space before reflecting light is constant, but now reverse has appearred in the direction of propagation of light path, reverse has also occurred in the sense of rotation for this folded light beam circularly polarized light, be that left circularly polarized light becomes right-circularly polarized light while returning, right-circularly polarized light becomes left circularly polarized light when returning.The circularly polarized light returned can pass through the same wave plate again, because the sense of rotation of circularly polarized light changes, polarization state before reflection ray when the wave plate will can not be got back to wave plate, now wave plate can make circularly polarized light continue to produce the phase delay of pi/2, becomes the polarized light vibrated perpendicular on the wiregrating direction.This polarized light can be absorbed through wiregrating the time, and can not enter light-source system.

Embodiment recited above is described preferred implementation of the present utility model; not scope of the present utility model is limited; design under spiritual prerequisite not breaking away from the utility model; various distortion and improvement that the common engineering technical personnel in this area make technical solutions of the utility model, all should fall in the definite protection domain of claims of the present utility model.

Claims

1. a sheet type isolator, it is characterized in that: comprise 1/4 zero-th order waveplates, described wave plate comprises optical glass glued together successively, wire grid polarizer and quartz crystal; The outside surface of described optical glass and quartz crystal is coated with respectively anti-reflection layer; The optical axis direction of described quartz crystal is positioned at logical light face, and with the direction of wiregrating in angle of 45 degrees.