CN203365809U

CN203365809U - Echo isolator having beam splitting function

Info

Publication number: CN203365809U
Application number: CN 201320418461
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 an echo isolator having the beam splitting function for reducing the echo reflection interference. The echo isolator comprises a piece of polarization beam splitting prism. Two outgoing surfaces of the polarization beam splitting prism are installed with a 1/4 wave plate respectively, wherein the optical axis of each of the two 1/4 wave plates forms an angle of 45 degrees with a horizontal plane. According to the echo isolator having the beam splitting function of the utility model, the isolation of returned light and reflected light is realized whiling performing beam splitting, additional echo isolation effects can be provided in an optical path system, and the echo reflection interference is further reduced.

Description

Echo isolator with the light splitting function

Technical field

The utility model relates to a kind of isolator, especially a kind of isolator of the echo with the light splitting function.

Background technology

Can use the light splitting original paper in many light path systems, the components and parts that simultaneously also can use numerous vertical optical paths to place, such components and parts may produce echo reflection, if reflected light enters light-source system, can produce many times third contact of a total solar or lunar eclipse spot, the normal operation of EVAC (Evacuation Network Computer Model), the signal to noise ratio (S/N ratio) of reduction system.Usually we plate antireflecting film and can reduce echo reflection on device, less echo reflection when improving with optical efficiency, but in actual use, element surface there will be the situations such as dust goes mouldy, and now parasitic light can increase, and echo strengthens.

The utility model content

The purpose of this utility model is to provide a kind of isolator of the echo with the light splitting function that echo reflection disturbs that reduces.

Realize the isolator of the echo with the light splitting function of the utility model purpose, comprise a polarization splitting prism, on two exit facets of described polarization splitting prism, be separately installed with a quarter wave plate, the optical axis of two described quarter wave plates becomes miter angle with surface level.

Between described quarter wave plate and polarization splitting prism, use the optical glue gummed that refractive index is complementary to form, the echo reflection brought to reduce device itself.

Be coated with antireflecting film on the plane of incidence of described polarization splitting prism and the exit facet of quarter wave plate.

The cemented surface of described polarization splitting prism is coated with polarization beam splitter.

The beneficial effects of the utility model are as follows: the isolator of the echo with the light splitting function of the present utility model, realize back reflective isolation in light splitting, and extra echo isolation effect can be provided in light path system, further reduce the interference of echo reflection.

The accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

The right view that Fig. 2 is Fig. 1.

Embodiment

Embodiment of the present utility model is as follows: as shown in Figure 1, 2, echo with light splitting function isolator of the present utility model, comprise a polarization splitting prism 1, the optical axis that is separately installed with 2, two described quarter wave plates 2 of a quarter wave plate on two exit facets of described polarization splitting prism 1 becomes miter angle with surface level.

Between described quarter wave plate 2 and polarization splitting prism 1, use the optical glue gummed that refractive index is complementary to form, can reduce the echo reflection that device itself brings.

Be coated with antireflecting film on the exit facet of the plane of incidence of described polarization splitting prism 1 and quarter wave plate 2.

The cemented surface of described polarization splitting prism 1 is coated with polarization beam splitter 3.

Principle of work of the present utility model is as follows: the light that light source sends arrives polarization splitting prism, the cemented surface of polarization splitting prism is coated with polarization beam splitter, can be divided into incident light according to polarization state the polarized light of the along continuous straight runs vibration seen through and the linearly polarized light of the vertical direction of reflection vibration.The light beam polarization direction that sees through wherein is called the P polarized light in the plane of incidence, and the polarization direction of folded light beam be called S polarized light vertical with the plane of incidence is coated with antireflecting film on the exit facet of wave plate, to increase the throughput of device itself.

Seeing through polarization beam splitter is the P polarized light, when arriving the azimuthal wave plate of 45 degree, 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 when the device 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.When 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 returns and makes circularly polarized light continue to produce the phase delay of pi/2, becomes the S polarized light vibrated on vertical direction.The S polarized light will be reflected through polarization splitting prism the time, and can not enter light-source system.

Similarly, on the reflected light path of Amici prism, the S polarized light also there will be pi/2 phase to postpone through quarter wave plate the time, become circularly polarized light, after being reflected during follow-up, reversing appears in sense of rotation, becomes the P polarized light during again through quarter wave plate, see through spectro-film, thereby be not reflected to 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. the isolator of the echo with the light splitting function, it is characterized in that: comprise a polarization splitting prism, on two exit facets of described polarization splitting prism, be separately installed with a quarter wave plate, the optical axis of two described quarter wave plates becomes miter angle with surface level.

2. the isolator of the echo with the light splitting function according to claim 1 is characterized in that: the optical glue gummed that uses refractive index to be complementary between described quarter wave plate and polarization splitting prism forms.

3. the isolator of the echo with the light splitting function according to claim 1, is characterized in that: on the plane of incidence of described polarization splitting prism and the exit facet of quarter wave plate, be coated with antireflecting film.

4. according to the arbitrary described isolator of the echo with the light splitting function of claim 1～3, it is characterized in that: the cemented surface of described polarization splitting prism is coated with polarization beam splitter.