CN103869418A - Broadband-spectrum high-damage-threshold optical isolator - Google Patents
Broadband-spectrum high-damage-threshold optical isolator Download PDFInfo
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- CN103869418A CN103869418A CN201410076349.3A CN201410076349A CN103869418A CN 103869418 A CN103869418 A CN 103869418A CN 201410076349 A CN201410076349 A CN 201410076349A CN 103869418 A CN103869418 A CN 103869418A
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Abstract
The invention provides a broadband-spectrum high-damage-threshold optical isolator, solving the problem that the crystal of a beam splitter restricts the damage threshold of the isolator in the prior art. The broadband-spectrum high-damage-threshold optical isolator comprises a first polarization cemented prism, a displacement prism, a second polarization cemented prism, a magneto-optical crystal and a chamber body, wherein the chamber body is provided with a cavity; the center axis of the cavity is an optical axis; the first polarization cemented prism, the magneto-optical crystal, the displacement prism and the second polarization cemented prism are arranged in the cavity in sequence along the direction of an optical path. According to the broadband-spectrum high-damage-threshold optical isolator, the cemented prisms are respectively used as the beam splitter; as the cemented prisms respectively have a higher damage threshold, the damage threshold of the optical isolator is not restricted.
Description
Technical field
The present invention relates to optoisolator field, refer to especially a kind of wide spectrum high damage threshold 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 allows Unidirectional light to pass through.The principle of work of optoisolator based on magneto-optical crystal Faraday effect, can effectively eliminate the damage of reflected light to light path system.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 the various solid-state lasers such as fiber laser, optical parameter oscillating laser, multistage amplifying laser device, all solid state frequency double laser, current isolator on the market, two ends are used yvo4 crystal beam splitter, the middle magneto-optical crystal for subsidiary permanent magnetic field, this kind of structural design can only be used for the light path of single wavelength, and isolator is subject to the restriction of yvo4 crystal, and damage threshold is less.
Summary of the invention
The present invention proposes a kind of wide spectrum high damage threshold optoisolator, has solved the problem of beam splitter crystal restriction isolator damage threshold in prior art.
Technical scheme of the present invention is achieved in that a kind of wide spectrum high damage threshold optoisolator, comprise the first polarization cemented prism, displacement prism, the second polarization cemented prism, magneto-optical crystal, be provided with the cavity of cavity, the central shaft of described cavity is optical axis, and described the first polarization cemented prism, magneto-optical crystal, displacement prism, the second polarization cemented prism are set in turn in described cavity along optical path direction.
As preferred technical scheme, described the first polarization 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 °; Described the first prism top end face is parallel with described the first cemented surface; On described the first prism top end face and described the first cemented surface, be all coated with the first optical thin film.
As preferred technical scheme, described the first optical thin film is to the transmission of p light, and transmission coefficient is greater than and equals 45 ° of 98%@, and to the reflection of s light, and reflection coefficient is greater than and equals 45 ° of 99.8%@.
As preferred technical scheme, rear end face that described displacement prism comprises perpendicular to the front end face of optical axis, be parallel to the top end face of optical axis, be arranged in parallel with the left side of optical axis angle at 45 °, with described front end face, the bottom face be arrangeding in parallel with described top end face, the right side be arrangeding in parallel with described left side; On described front end face and described rear end face, be all coated with the second optical thin film; On described left side and described right side, be all coated with the 3rd optical thin film.
As preferred technical scheme, described the second optical thin film is to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 98%@; Described the 3rd optical thin film is to s light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@.
As preferred technical scheme, described the second polarization 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, described the second cemented surface and optical axis angle at 45 °, be coated with the 4th 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 5th optical thin film; Described prism front end face, described the 4th prism front end face, described prism rear end face are all perpendicular to optical axis; On described prism front end face, be coated with the 6th optical thin film; On described the 4th prism front end face, be coated with the 7th optical thin film; On described prism rear end face, be coated with the 8th optical thin film.
As preferred technical scheme, described the 4th optical thin film is to the transmission of s light, and transmission coefficient is greater than and equals 45 ° of 98%@; Described the 5th optical thin film is to p light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@; Described the 6th optical thin film is to the transmission of p light, and reflection coefficient is greater than and equals 0 ° of 98%@; Described the 7th optical thin film is to the transmission of s light, and reflection coefficient is greater than and equals 0 ° of 98%@; Described the 8th optical thin film is to the transmission of p light, and transmission coefficient is greater than and equals 0 ° of 98%@, and to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 99.8%@.
When light beam forward process optical axis, first be divided into p light and s light by the first polarization cemented prism, the eye point of s light separates with P light eye point, through 45 ° of magneto-optical crystal rear polarizer direction rotations, p light and s light are converted into p0 light and s0 light, displacement prism is moved to a certain ad-hoc location by s0 light after by 2 secondary reflections, p0 light is also moved to same ad-hoc location after the second polarization cemented prism reflection, two-beam synthesizes natural light when from the second polarization cemented prism outgoing, when light beam oppositely passes through optical axis, between magneto-optical crystal and the second gummed polarizing prism, light path is reversible, but according to Faraday effect principle, during through magneto-optical crystal, polarization direction sense of rotation during with forward-propagating sense of rotation identical, rather than reverse, therefore oppositely by 90 ° of p light before the first polarizing prism and s polarisation of light direction and forward-propagating phase differences, also just can not be synthetic by the first polarization cemented prism, but go out from the upper and lower surface transmission of the first polarization cemented prism respectively, absorbed by light absorbent, so just realize backlight isolation, owing to only having utilized reflection and transmission, can be used for isolating broadband, simultaneously, cemented prism has higher damage threshold, solve the problem of beam splitter crystal restriction isolator damage threshold.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention 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 some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that forward light path is by the structural representation of optoisolator;
Fig. 2 is that reverse optical path is by the structural representation of optoisolator;
Fig. 3 is that schematic diagram is looked on a left side for the first polarization cemented prism;
Fig. 4 is the schematic top plan view of displacement prism;
Fig. 5 is that schematic diagram is looked on a left side for the second polarization cemented prism;
Fig. 6 is the change procedure figure of polarization direction in light path.
In figure: L1-the first polarization cemented prism; L2-displacement prism; L3-the second polarization cemented prism; C-magneto-optical crystal; L11-the first prism; L12-the second prism; L31-prism; L32-the 4th prism; F11-the first optical thin film; F21-the second optical thin film; F22-the 3rd optical thin film; F31-the 4th optical thin film; F32-the 5th optical thin film; F33-the 6th optical thin film; F34-the 7th optical thin film; F35-the 8th optical thin film; S11-the first prism front end face; S12-the second prism rear end face; S13-the first prism rear end face; S15-the second prism bottom face; S35-the 4th prism bottom face.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1 and Figure 2, a kind of wide spectrum high damage threshold optoisolator, comprise the first polarization cemented prism L1, displacement prism L2, the second polarization cemented prism L3, magneto-optical crystal C, be provided with the cavity of cavity, the central shaft of cavity is optical axis, and the first polarization cemented prism L1, magneto-optical crystal C, displacement prism L2, the second polarization cemented prism L3 are set in turn in cavity along optical path direction.
As shown in Figure 3, the first polarization 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 °; The first prism top end face is parallel with the first cemented surface; On the first prism top end face and the first cemented surface, be all coated with the first optical thin film F11; The first optical thin film F11 is to the transmission of p light, and transmission coefficient is greater than and equals 45 ° of 98%@, and to the reflection of s light, and reflection coefficient is greater than and equals 45 ° of 99.8%@.The first prism front end face S11, the first prism rear end face S13 and the second prism rear end face S12 are all perpendicular to optical axis, and the second prism bottom face S15 is parallel to optical axis.
Magneto-optical crystal C has the permanent magnetic field that is parallel to optical axis, clockwise direction, the light rotation angle of magneto-optical crystal C is 45 °, computing formula β=the vBd of magneto-optical crystal C rotation angle arc, wherein, β is rotation angle arc, B is the component of magnetic field towards light wave propagation direction, d is the length of light wave and magnetic field interaction, and the Verdet constant that v is material is relevant with material essence, wavelength and temperature.
As shown in Figure 4, displacement prism L2 comprise perpendicular to the front end face of optical axis, be parallel to the top end face of optical axis, the rear end face that be arranged in parallel with the left side of optical axis angle at 45 °, with front end face, the bottom face be arrangeding in parallel with top end face, the right side that be arranged in parallel with left side; On front end face and rear end face, be all coated with the second optical thin film F21, the second optical thin film F21 is to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 98%@; On left side and right side, be all coated with the 3rd optical thin film F22, the 3rd optical thin film F22 is to s light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@, and the left side of displacement prism L2, right side are all perpendicular to the bottom face of displacement prism L2.
As shown in Figure 5, the second polarization cemented prism L3 is by prism L31, form with fixing the 4th prism L32 of prism L31 gummed, prism L31 and the 4th prism L32 end face are in opposite directions the second cemented surface, the second cemented surface and optical axis angle at 45 °, is coated with the 4th optical thin film F31 on the second cemented surface; On the prism top end face be arrangeding in parallel with the second cemented surface, be coated with the 5th optical thin film F32; Prism front end face, the 4th prism front end face, prism rear end face are all perpendicular to optical axis; On prism front end face, be coated with the 6th optical thin film F33; On the 4th prism front end face, be coated with the 7th optical thin film F34; On prism rear end face, be coated with the 8th optical thin film F35, the 4th prism bottom face S35 is parallel to optical axis.The 4th optical thin film F31 is to the transmission of s light, and transmission coefficient is greater than and equals 45 ° of 98%@; The 5th optical thin film F32 is to p light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@; The 6th optical thin film F33 is to the transmission of p light, and reflection coefficient is greater than and equals 0 ° of 98%@; The 7th optical thin film F34 is to the transmission of s light, and reflection coefficient is greater than and equals 0 ° of 98%@; The 8th optical thin film F35 is to the transmission of p light, and transmission coefficient is greater than and equals 0 ° of 98%@, and to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 99.8%@.
As shown in Figure 6, the principle of work of optoisolator: the first polarization cemented prism L1 is for being separated into the two mutually perpendicular polarized lights in bundle polarization direction by natural light, 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 first prism top end face, the s light being reflected is reflected, two-beam p light and s light are respectively along OA, O ' A ' two-way enters magneto-optical crystal C, due to the result of Faraday effect, the polarization direction that sees through two-beam from magneto-optical crystal C is 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 displacement prism L2 and the second polarization cemented prism L3, ShiOA road light is s light to displacement prism L2, when after displacement prism L2, it is p light that output light enters the second polarization cemented prism L3, it is s light that O ' A ' road light enters the second polarization cemented prism L3, and p light, through the second polarization cemented prism L3 top end face and the reflection of the second cemented surface, merges with the s light from the second cemented surface transmission, like this, the second polarization cemented prism L3 is by s light and p light synthetic natural light again.For guaranteeing that OA road light is s light to displacement prism L2, be p light to the second polarization cemented prism L3, need the bottom surface of displacement prism L2 and the second polarization cemented prism L3 with respect to 45 ° of the first polarization cemented prism L1 rotations.
In this system, reflected light, after the second polarization cemented prism L3, is divided into the mutually perpendicular polarized light in a pair of polarization direction, and this is to polarized light after magneto-optical crystal C, and its polarization direction rotates 45° angle equally; Reflected light polarization direction has rotated 90 ° compared with incident light, reflected light A ' O ' directly sees through after arriving the first polarization cemented prism L1 top end face, AO is reflected from the direction outgoing vertical with incident light by the first cemented surface, therefore reflected light can not be reflected back toward original optical path, play catoptrical buffer action.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a wide spectrum high damage threshold optoisolator, is characterized in that:
Comprise the first polarization cemented prism, displacement prism, the second polarization cemented prism, magneto-optical crystal, be provided with the cavity of cavity,
The central shaft of described cavity is optical axis,
Described the first polarization cemented prism, magneto-optical crystal, displacement prism, the second polarization cemented prism are set in turn in described cavity along optical path direction.
2. the wide spectrum high damage threshold of one as claimed in claim 1 optoisolator, is characterized in that:
Described the first polarization 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 °;
Described the first prism top end face is parallel with described the first cemented surface;
On described the first prism top end face and described the first cemented surface, be all coated with the first optical thin film.
3. the wide spectrum high damage threshold of one as claimed in claim 2 optoisolator, is characterized in that:
Described the first optical thin film is to the transmission of p light, and transmission coefficient is greater than and equals 45 ° of 98%@, and to the reflection of s light, and reflection coefficient is greater than and equals 45 ° of 99.8%@.
4. the wide spectrum high damage threshold of one as claimed in claim 3 optoisolator, is characterized in that:
Rear end face that described displacement prism comprises perpendicular to the front end face of optical axis, be parallel to the top end face of optical axis, be arranged in parallel with the left side of optical axis angle at 45 °, with described front end face, the bottom face be arrangeding in parallel with described top end face, the right side be arrangeding in parallel with described left side;
On described front end face and described rear end face, be all coated with the second optical thin film;
On described left side and described right side, be all coated with the 3rd optical thin film.
5. the wide spectrum high damage threshold of one as claimed in claim 4 optoisolator, is characterized in that:
Described the second optical thin film is to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 98%@;
Described the 3rd optical thin film is to s light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@.
6. the wide spectrum high damage threshold of the one as described in claim 4 or 5 optoisolator, is characterized in that:
Described the second polarization 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 4th 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 5th optical thin film;
Described prism front end face, described the 4th prism front end face, described prism rear end face are all perpendicular to optical axis;
On described prism front end face, be coated with the 6th optical thin film;
On described the 4th prism front end face, be coated with the 7th optical thin film;
On described prism rear end face, be coated with the 8th optical thin film.
7. the wide spectrum high damage threshold of one as claimed in claim 6 optoisolator, is characterized in that:
Described the 4th optical thin film is to the transmission of s light, and transmission coefficient is greater than and equals 45 ° of 98%@;
Described the 5th optical thin film is to p light reflection, and reflection coefficient is greater than and equals 45 ° of 98%@;
Described the 6th optical thin film is to the transmission of p light, and reflection coefficient is greater than and equals 0 ° of 98%@;
Described the 7th optical thin film is to the transmission of s light, and reflection coefficient is greater than and equals 0 ° of 98%@;
Described the 8th optical thin film is to the transmission of p light, and transmission coefficient is greater than and equals 0 ° of 98%@, and to the transmission of s light, and transmission coefficient is greater than and equals 0 ° of 99.8%@.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410076349.3A CN103869418B (en) | 2014-03-04 | A kind of wide spectrum high damage threshold optoisolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410076349.3A CN103869418B (en) | 2014-03-04 | A kind of wide spectrum high damage threshold optoisolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103869418A true CN103869418A (en) | 2014-06-18 |
| CN103869418B CN103869418B (en) | 2016-11-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597631A (en) * | 2016-12-07 | 2017-04-26 | 中山市光大光学仪器有限公司 | Clamp and method used for gluing prism |
| CN111347158A (en) * | 2020-03-20 | 2020-06-30 | 华中科技大学 | Compound welding set of semiconductor blue light laser and fiber laser |
| CN111694100A (en) * | 2019-03-13 | 2020-09-22 | 福州高意光学有限公司 | Polarization-independent small-sized integrated free space isolator |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0493814A (en) * | 1990-08-03 | 1992-03-26 | Fuji Elelctrochem Co Ltd | Production of optical isolator |
| JPH08286149A (en) * | 1995-04-13 | 1996-11-01 | Tdk Corp | Optical isolator element and its production |
| US6088153A (en) * | 1997-06-26 | 2000-07-11 | Scientific-Atlanta, Inc. | Multi-functional optical isolator |
| US20040080805A1 (en) * | 2001-02-28 | 2004-04-29 | Miguel Levy | Magneto-photonic crystal isolators |
| CN102096210A (en) * | 2010-11-22 | 2011-06-15 | 福建福晶科技股份有限公司 | Faraday optoisolator used in wide band |
| CN203759301U (en) * | 2014-03-04 | 2014-08-06 | 青岛海泰光电技术有限公司 | Optical isolator with broadband spectrum and high damage threshold |
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0493814A (en) * | 1990-08-03 | 1992-03-26 | Fuji Elelctrochem Co Ltd | Production of optical isolator |
| JPH08286149A (en) * | 1995-04-13 | 1996-11-01 | Tdk Corp | Optical isolator element and its production |
| US6088153A (en) * | 1997-06-26 | 2000-07-11 | Scientific-Atlanta, Inc. | Multi-functional optical isolator |
| US20040080805A1 (en) * | 2001-02-28 | 2004-04-29 | Miguel Levy | Magneto-photonic crystal isolators |
| CN102096210A (en) * | 2010-11-22 | 2011-06-15 | 福建福晶科技股份有限公司 | Faraday optoisolator used in wide band |
| CN203759301U (en) * | 2014-03-04 | 2014-08-06 | 青岛海泰光电技术有限公司 | Optical isolator with broadband spectrum and high damage threshold |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597631A (en) * | 2016-12-07 | 2017-04-26 | 中山市光大光学仪器有限公司 | Clamp and method used for gluing prism |
| CN111694100A (en) * | 2019-03-13 | 2020-09-22 | 福州高意光学有限公司 | Polarization-independent small-sized integrated free space isolator |
| CN111347158A (en) * | 2020-03-20 | 2020-06-30 | 华中科技大学 | Compound welding set of semiconductor blue light laser and fiber laser |
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