CN203759300U - Optical isolator - Google Patents
Optical isolator Download PDFInfo
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- CN203759300U CN203759300U CN201420095814.3U CN201420095814U CN203759300U CN 203759300 U CN203759300 U CN 203759300U CN 201420095814 U CN201420095814 U CN 201420095814U CN 203759300 U CN203759300 U CN 203759300U
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- prism
- light
- cemented
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Abstract
The utility model provides an optical isolator. With the optical isolator, a problem that the existing optical isolator is only used for narrow band isolation in the prior art is solved. The optical isolator consists of a first cemented prism, a magneto-optic crystal, a half wave plate, a second cemented prism, and a cavity body with a cavity; the central axis of the cavity is an optical axis; the first cemented prism, the magneto-optic crystal, the half wave plate, and the second cemented prism are successively arranged at the central axis in the cavity along the direction of the light path. The cemented prisms and the wave plate are introduced into the optical isolator, thereby realizing the design of natural light separation at the polarization direction; and optical thin films are plated at the cemented prisms, thereby realizing the good isolation effect of the natural light.
Description
Technical field
The utility model relates to optoisolator field, refers to especially a kind of optoisolator.
Background technology
In laser system, due to the reflex of the optical element in light path to light source, tend to make system to produce harmful effect.In order to solve this difficult problem, can consider to put into the optical passive component that a permission Unidirectional light passes through.Based on the principle of work of magneto-optical crystal Faraday effect, in system light path, add optoisolator, can effectively eliminate reflected light to systematically damage.
It is low that optoisolator has forward insertion loss, reverse isolation degree is high, return loss is high, allow light to a direction by the characteristic such as stop that reflected light passes through, can be widely used in fiber laser, optical parameter oscillating laser, multistage amplifying laser device, all solid state frequency double laser etc., in various semi-conductor solid lasers, the optoisolator of current existing multiple design, but still not for broadband optoisolator.
Utility model content
The utility model proposes a kind of optoisolator, solved the problem that optoisolator in prior art can only be used for isolating narrow wave band.
The technical solution of the utility model is achieved in that a kind of optoisolator, comprises the first cemented prism, magneto-optical crystal, half-wave plate, the second cemented prism, is provided with the cavity of cavity; The central shaft of described cavity is optical axis; Described the first cemented prism, magneto-optical crystal, half-wave plate, the second cemented prism are set in turn on the central shaft in described cavity along optical path direction.
As preferred technical scheme, described the first cemented prism is by the first prism, form with fixing the second prism of described the first prism cementing; Described the first prism and described the second prism end face are in opposite directions the first cemented surface, described the first cemented surface and optical axis angle at 45 °, and be coated with the first optical thin film on described the first cemented surface; The the second prism bottom face be arrangeding in parallel with described the first cemented surface is provided with the second optical thin film; Described the first prism top end face is parallel with optical axis.
As preferred technical scheme, described the first optical thin film is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@; Described the second optical thin film all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@.
As preferred technical scheme, described the second cemented prism is by prism, form with fixing the 4th prism of described prism gummed; Described prism and described the 4th prism end face are in opposite directions the second cemented surface, and described the second cemented surface and optical axis angle at 45 ° are coated with the 3rd optical thin film on described the second cemented surface; On the prism top end face be arrangeding in parallel with described the second cemented surface, be coated with the 4th optical thin film; Described the 4th prism bottom face is parallel to optical axis; The angle of described the second cemented surface and described the 4th prism bottom face is 45 °.
As preferred technical scheme, described the 3rd optical thin film is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@; Described the 4th optical thin film all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@.
As preferred technical scheme, the angle of described half-wave plate optical axis and vertical direction is 22.5 °; Along in optical axis clockwise direction, described half-wave plate is 45 ° to the light rotation angle of p light, is 225 ° to the light rotation angle of s light.
As preferred technical scheme, described the first prism top end face is parallel to described the 4th prism bottom face.
The utility model is compared produced beneficial effect with background technology:
In optoisolator, introduce cemented prism and wave plate for the polarization direction separate design to natural light, and in cemented prism, be coated with optical thin film, can realize the good isolation effect to natural light.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of optoisolator of the utility model;
Fig. 2 is that schematic diagram is looked on a left side for the first cemented prism;
Fig. 3 is that schematic diagram is looked on a left side for the second cemented prism;
Fig. 4 is light polarization variations schematic diagram in each components and parts.
In figure: L1-the first cemented prism; L2-the second cemented prism; C-magneto-optical crystal; B-half-wave plate; L11-the first prism; L12-the second prism; L21-prism; L22-the 4th prism; S11-the second prism front end face; S12-the second prism rear end face; S13-the first prism rear end face; S14-the first prism top end face; S21-prism front end face; S22-the 4th prism front end face; S23-prism rear end face; S24-the 4th prism bottom face; F11-the first optical thin film; F12-the second optical thin film; F21-the 3rd optical thin film; F22-the 4th optical thin film.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, a kind of optoisolator, comprises the first cemented prism L1, magneto-optical crystal C, half-wave plate B, the second cemented prism L2, is provided with the cavity of cavity; The central shaft of cavity is optical axis; The first cemented prism L1, magneto-optical crystal C, half-wave plate B, the second cemented prism L2 are set in turn on the central shaft in cavity along optical path direction.
As shown in Figure 2, the first cemented prism L1 is by the first prism L11, form with fixing the second prism L12 of the first prism L11 gummed; The first prism L11 and the second prism L12 end face are in opposite directions the first cemented surface, the first cemented surface and optical axis angle at 45 °, and on the first cemented surface, be coated with the first optical thin film F11; The the second prism bottom face be arrangeding in parallel with the first cemented surface is provided with the second optical thin film F12; The first prism top end face S14 is parallel with optical axis, and the second prism front end face S11, the second prism rear end face S12 and the first prism rear end face S13 are all perpendicular to optical axis.The first optical thin film F11 is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@; The second optical thin film F12 all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@.
Magneto-optical crystal C has the permanent magnetic field that is parallel to optical axis, and in optical axis clockwise direction, the light rotation angle of magneto-optical crystal C is 45 °, and according to Faraday effect principle, during through magneto-optical crystal C, the sense of rotation of polarization direction and the direction of propagation are irrelevant.
As shown in Figure 3, the second cemented prism L2 is by prism L21, form with fixing the 4th prism L22 of prism L21 gummed; Prism L21 and the 4th prism L22 end face are in opposite directions the second cemented surface, and the second cemented surface and optical axis angle at 45 ° is coated with the 3rd optical thin film F21 on the second cemented surface; On the prism top end face be arrangeding in parallel with the second cemented surface, be coated with the 4th optical thin film F22; The angle of the second cemented surface and the 4th prism bottom face is 45 °, and prism front end face S21, prism rear end face S23, the 4th prism front end face S22 are all perpendicular to optical axis, and the 4th prism bottom face S24 is parallel to optical axis.The 3rd optical thin film F21 is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@; The 4th optical thin film F22 all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@, and the first prism top end face S14 is parallel to the 4th prism bottom face S24.
Half-wave plate B comprises the rear end face be arrangeding in parallel perpendicular to optical axis front end face, with front end face, the angle of half-wave plate B optical axis and vertical direction is 22.5 °, along in optical axis clockwise direction, half-wave plate B is 45 ° to the light rotation angle of p light, is 225 ° to the light rotation angle of s light.C is different from magneto-optical crystal, and when light process half-wave plate B, the sense of rotation of polarized light is relevant with the direction of propagation; The sense of rotation of backpropagation is contrary with the sense of rotation of forward-propagating.
As Fig. 1, shown in Fig. 4, a figure in Fig. 1 is forward index path, b figure is reverse optical path figure, Fig. 4 observes light transmission polarization variations schematic diagram in isolator for meeting light, wherein (a) figure is incident light, (b) figure is reflected light, the principle of work of optoisolator: in the time that a branch of natural light arrives the first cemented surface, p light will be through this face, s light will be reflected, in the time that arriving the second prism bottom face, the s light being reflected is reflected, two-beam p light and s light are respectively along OP, O ' P ' two-way enters magneto-optical crystal C, due to the result of Faraday effect, make the polarization direction of the two-beam seeing through from magneto-optical crystal C all to an angle that direction rotation is certain, this angle is 45 °.Because the polarization direction of two light beams all rotates same angle, the polarization direction of two-beam is still orthogonal.In two-way light path, add half-wave plate B, during through half-wave plate B, 45 ° of OP road light rotations, add 45 ° that in magneto-optical crystal C, rotate, and half-twist, becomes s light altogether; 225 ° of O ' P ' road light rotations, corotation turns 270 °, becomes p light.P light, through the reflection of prism top end face and the second cemented surface, merges with the s light from the second cemented surface transmission.Like this, the second cemented prism L2 is by s light and p light synthetic natural light again.In reflected light path, reflected light, after the second cemented prism L2, is divided into the mutually perpendicular polarized light in a pair of polarization direction, and what light path was forward-propagating is reverse, but after magneto-optical crystal C, its polarization direction rotation 45° angle; So, reflected light polarization direction has rotated 90 ° compared with incident light, and the p light on O ' P ' road upwards reflects while arriving the second prism bottom face, passes the first cemented surface from the first prism top end face S14 outgoing; The s light on OP road is reflected from the first prism top end face S14 outgoing by the first cemented surface, therefore reflected light is vertical with incident direction, can not be reflected back toward original optical path, has played catoptrical buffer action.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (7)
1. an optoisolator, is characterized in that:
Comprise the first cemented prism, magneto-optical crystal, half-wave plate, the second cemented prism, be provided with the cavity of cavity;
The central shaft of described cavity is optical axis;
Described the first cemented prism, magneto-optical crystal, half-wave plate, the second cemented prism are set in turn on the central shaft in described cavity along optical path direction.
2. a kind of optoisolator as claimed in claim 1, is characterized in that:
Described the first cemented prism is by the first prism, form with fixing the second prism of described the first prism cementing;
Described the first prism and described the second prism end face are in opposite directions the first cemented surface, described the first cemented surface and optical axis angle at 45 °, and be coated with the first optical thin film on described the first cemented surface;
The the second prism bottom face be arrangeding in parallel with described the first cemented surface is provided with the second optical thin film;
Described the first prism top end face is parallel with optical axis.
3. a kind of optoisolator as claimed in claim 2, is characterized in that:
Described the first optical thin film is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@;
Described the second optical thin film all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@.
4. a kind of optoisolator as claimed in claim 3, is characterized in that:
Described the second cemented prism is by prism, form with fixing the 4th prism of described prism gummed;
Described prism and described the 4th prism end face are in opposite directions the second cemented surface, and described the second cemented surface and optical axis angle at 45 ° are coated with the 3rd optical thin film on described the second cemented surface;
On the prism top end face be arrangeding in parallel with described the second cemented surface, be coated with the 4th optical thin film;
Described the 4th prism bottom face is parallel to optical axis;
The angle of described the second cemented surface and described the 4th prism bottom face is 45 °.
5. a kind of optoisolator as claimed in claim 4, is characterized in that:
Described the 3rd optical thin film is to the transmission of p light and to the reflection of s light, transmission coefficient is more than or equal to 45 ° of 98%@, and reflection coefficient is more than or equal to 45 ° of 99.8%@;
Described the 4th optical thin film all reflects p light and s light, and reflection coefficient is more than or equal to 45 ° of 99.8%@.
6. a kind of optoisolator as claimed in claim 5, is characterized in that:
The angle of described half-wave plate optical axis and vertical direction is 22.5 °;
Along in optical axis clockwise direction, described half-wave plate is 45 ° to the light rotation angle of p light, is 225 ° to the light rotation angle of s light.
7. a kind of optoisolator as described in claim 5 or 6, is characterized in that:
Described the first prism top end face is parallel to described the 4th prism bottom face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420095814.3U CN203759300U (en) | 2014-03-04 | 2014-03-04 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420095814.3U CN203759300U (en) | 2014-03-04 | 2014-03-04 | Optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759300U true CN203759300U (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420095814.3U Expired - Fee Related CN203759300U (en) | 2014-03-04 | 2014-03-04 | Optical isolator |
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| Country | Link |
|---|---|
| CN (1) | CN203759300U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852825A (en) * | 2014-03-04 | 2014-06-11 | 青岛海泰光电技术有限公司 | Optical isolator |
-
2014
- 2014-03-04 CN CN201420095814.3U patent/CN203759300U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852825A (en) * | 2014-03-04 | 2014-06-11 | 青岛海泰光电技术有限公司 | Optical isolator |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 |