CN103558688B - A kind of broadband double-refraction phase compensator - Google Patents
A kind of broadband double-refraction phase compensator Download PDFInfo
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- CN103558688B CN103558688B CN201310504072.5A CN201310504072A CN103558688B CN 103558688 B CN103558688 B CN 103558688B CN 201310504072 A CN201310504072 A CN 201310504072A CN 103558688 B CN103558688 B CN 103558688B
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- wedge
- birefringece crystal
- birefringence
- angle
- compensator
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Abstract
The present invention is applicable to optical technical field, provides a kind of variable-broadband birefringence phase compensator.Described compensator comprise the first wedge to, the second wedge to a pair of refraction flat-plate.Described first wedge, to comprising the angle of wedge and first wedge in opposite directions placed and second wedge all identical with optical axis direction, is made up of the first birefringece crystal; Described second wedge, to comprising the angle of wedge and three wedge in opposite directions placed and four wedge all identical with optical axis direction, is made up of the second birefringece crystal; Described birefringence flat board is made up of the 3rd birefringece crystal.The kind of first, second and third birefringece crystal is different; Described first and second meets single order birefringence dispersion compensation condition with the selection of three birefringent crystal material and variation in thickness ratio; Described second wedge and the 3rd wedge are fixed together synchronizing moving can the birefringent phase of this compensator of linear regulation.This compensator can the different birefringent phases of broadband compensation incident light as required, easy to operate.
Description
Technical field
The invention belongs to optical technical field, particularly relate to a kind of broadband double-refraction phase compensator.
Background technology
Two field vectors vibrated in mutually perpendicular direction can be made to produce certain optical path difference or the device of phase differential, be called phase compensator.Traditional continuously changing the orthogonal two bunch polarized lights generations of direction of vibration is that controllable phase difference compensation has Babinet and Suo Lier-Babinet phase compensator: Babinet compensator is split by the quartz crystal of two homogeneities and formed, these two optical axises split are mutually vertical, its shortcoming to use superfine incident beam, because the different piece of wide light beam can produce different phase differential; And Suo Lier-Babinet phase compensator can make up this deficiency, it is made up of two parallel quartz wedges and a quartzy surface plate, the optical axis that the optical axis and two of quartz plate is split is vertical, on split and can be made it to move in parallel by fine adjustment screw, thus change light and obtained the phase value of certain wavelength by the gross thickness that two split.
Compensator can the birefringent phase that produces of compensating optical element, also can introduce a fixing delay biased in an optical device.After calibration calibration, can also be used to the phase delay measuring wave plate to be asked.Therefore be widely used.But due to the effect of dispersion of birefringece crystal, the bandwidth of operation of traditional phase compensator is all narrow, this can have a strong impact on its working effect in broad band laser and application system thereof.
Summary of the invention
The object of the present invention is to provide a kind of structure simple and be easy to the broadband double-refraction phase compensator that regulates.
The present invention is achieved in that a kind of broadband double-refraction phase compensator, comprises the first wedge, the second wedge, the 3rd wedge, the 4th wedge and the birefringence flat board that sequentially arrange; Described first wedge and the second wedge are made by the first birefringece crystal, their angle of wedge and optical axis direction identical, both place formation first wedge pair in opposite directions; Described 3rd wedge and the 4th wedge are made by the second birefringece crystal, their angle of wedge and optical axis direction identical, both place formation second wedge pair in opposite directions; Described birefringence flat board is made up of the 3rd birefringece crystal, described first birefringece crystal, the second birefringece crystal and the 3rd birefringece crystal inequality in material formation.
First birefringece crystal is cut into the angle of wedge and identical the first wedge of optical axis direction and the second wedge by the present invention, and both place formation first wedge pair in opposite directions; Second birefringece crystal is cut into the angle of wedge and identical the 3rd wedge of optical axis direction and the 4th wedge, both place formation second wedge pair in opposite directions; 3rd birefringece crystal is cut into birefringence flat board, wherein said first birefringece crystal, the second birefringece crystal and the 3rd birefringece crystal inequality in material formation.Be fixed together described second wedge and the 3rd wedge synchronizing moving, by the thickness that makes described first wedge right and the right thickness equal proportion change of the second wedge when they move.The selection of this ratio need meet the first wedge to and the second wedge pair between single order birefringence dispersion compensation condition.Selected birefringence plate material and thickness thereof need to coordinate the thickness being operated in zero birefraction phase place place with first and second selected wedge and also meets single order birefringence dispersion compensation condition.This phase compensator can the different birefringent phases of broadband compensation incident light as required, easy to operate.Be applicable to broad band laser and application system thereof.
Accompanying drawing explanation
Fig. 1 is the structural representation of the broadband double-refraction phase compensator that the embodiment of the present invention provides;
Fig. 2 is the KDP/MgF that the embodiment of the present invention provides
2+ ADP(d
c=4000 μm) phase place of phase compensator and the graph of relation of wavelength.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the broadband double-refraction phase compensator that the embodiment of the present invention provides comprises the first wedge 1, second wedge 2, the 3rd wedge 3, the 4th wedge 4 and the birefringence flat board 5 that sequentially arrange.Wherein, the angle of wedge and the optical axis direction of described first wedge 1 and the second wedge 2 are identical, and make by the first birefringece crystal, both arrange the optical flat being equivalent to a variable thickness in opposite directions; The angle of wedge and the optical axis direction of described 3rd wedge 3 and the 4th wedge 4 are identical, and make by the second birefringece crystal, both arrange the optical flat being equivalent to another variable thickness in opposite directions.Described birefringence flat board 5 is made up of the 3rd birefringece crystal, described first birefringece crystal, the second birefringece crystal and the 3rd birefringece crystal inequality in material formation.Such as, described first birefringece crystal can select KDP crystal, and namely the first wedge 1 and the second wedge 2 are KDP crystal; Described second birefringece crystal can select MgF
2crystal, namely the 3rd wedge 3 and the 4th wedge 4 are MgF
2crystal; Described 3rd birefringece crystal can select ADP crystal, and namely birefringence dull and stereotyped 5 is ADP crystal.
For making this phase compensator can be operated near zero phase, the first wedge pair is made to disappear mutually, so have to the birefringent phase that the birefringent phase sum produced and birefringence flat board produce with the second wedge
Simultaneously for making bandwidth of operation optimization, selected birefringece crystal and each wedge thickness to, birefringence flat board must meet single order birefringence dispersion compensation condition, namely
Wherein d
a0, d
b0and d
cbe respectively the first wedge of being operated in zero phase place to, the second wedge to the thickness with birefringence flat board.η
i(λ) (i=A, B or C) is the minimum and maximum refringence of birefringece crystal in af at wavelength lambda, is defined as
η
i(λ)=n
o(λ)-n
e(λ), （3）
And η
i (m)(λ
0) (i=A, B; M=1,2 ...) represent η
iin wavelength X
0the m level derivative at place.D can be obtained according to formula (1), (2)
a0, d
b0and d
cratio.Like this when the first wedge pair and the right thickness of the second wedge depart from d
a0and d
b0time, the birefringent phase of compensator with regard to offset from zero, so should have
η
A(λ
0)·d
A+η
B(λ
0)·d
B=nλ
0（4）
(4) n λ in formula
0for the birefringent retardation of compensator, such as, n=0.5 is half-wave plate, and n=0.25 is quarter-wave plate.Wherein d
a, d
bbe respectively the first wedge to, the second wedge to relative to d
a0, d
b0thickness bias.For realizing broadband double-refraction phase, single order birefringence dispersion compensation condition need be met
Obviously, for given n value, d can be asked from (4), (5) two formulas
a, d
bvalue.As long as increase on year-on-year basis or reduce d
a, d
bvalue can regulate n value to realize variable-broadband birefringence phase on year-on-year basis and compensate.Such as, d is regulated in proportion
a, d
bvalue makes n value can change between-0.5 to 0.5, and compensator compensates scope just can be made to be increased to 180 ° from-180 °.If d in above-mentioned calculating
a, d
bvalue is jack per line, then show that their optical axis of crystal directions are identical, otherwise their optical axis of crystal direction each other at an angle of 90.According to Theoretical Design principle above, for KDP/MgF
2the compensator of/ADP combination of materials, can calculate as n=0.5, d
a=39.1 μm, d
b=162.1 μm.If select d
c=2000 μm, then d
a0=-1816.8 μm, d
b0=2671.2 μm.D
a0and d
b0the optical axis direction that the negative sign of value shows them at an angle of 90, but d
b0value and d
cjack per line illustrates that the second birefringece crystal is consistent with the optical axis direction of the 3rd birefringece crystal.It can thus be appreciated that, the right thickness of first and second wedge is adjustable, in the embodiment of the present invention, the first wedge is 1816.8 ~ 1816.8+2 × 39.1 μm to thickness adjustable extent, second wedge is 2671.2 ~ 2671.2+2 × 162.1 μm to thickness adjustable extent, and designed phase compensator can realize the scope birefringent phase from 0 ° to 360 ° and compensate.
Regulate for simplifying, easy to use, the second wedge 2 described here and the 3rd wedge 3 are arranged in the same way, and are placed in same linear translation platform, make the thickness bias d that first and second wedge described is right when they move like this
aand d
bequal proportion changes by value.If
tg(α
A)/tg(α
B)=μ=d
A/d
B（6）
As long as then by mobile described translation stage, just by changing d in proportion
aand d
bvalue regulates birefringent phase, and (4), (5) two formulas meet all the time.
If the centre wavelength of designed phase compensator is 800nm, the spectral range of work is 650nm ~ 950nm.The birefringent phase that Fig. 2 provides Theoretical Design central wavelength compensator is respectively 0,90 °, 180 °, 270 ° (corresponding n value is respectively 0,0.25,0.5,0.75).In 650nm ~ 950nm spectral region, maximum skew is respectively 5.52 °, 3.91 °, 2.41 ° and 0.86 °.What in Fig. 2, a line was corresponding is the Babinet compensator that single quartz crystal is made, and its maximum deviation is up to 44.3 °.Visible the present invention reduces maximum deviation greatly, thus can significantly increase work live width.And all curves have same rule in Fig. 2: the closer to centre wavelength, digital baseband input signal is less, this illustrates that phase compensator of the present invention compares and is applicable to ultrashort laser pulse, and most of energy of this pulse all concentrates near centre wavelength.
As for the design of first and second wedge to the angle of wedge, from the known d of calculating above
a/ d
b=0.2412, if select α
b=3 °, so α
a=0.7245 °.Its angular resolution depends on the minimum step of aforementioned translation stage.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a broadband double-refraction phase compensator, is characterized in that, described phase compensator comprises the first wedge, the second wedge, the 3rd wedge, the 4th wedge and the birefringence flat board that sequentially arrange; Described first wedge and the second wedge are made by the first birefringece crystal, their angle of wedge and optical axis direction identical, both place formation first wedge pair in opposite directions; Described 3rd wedge and the 4th wedge are made by the second birefringece crystal, their angle of wedge and optical axis direction identical, both place formation second wedge pair in opposite directions; Described birefringence flat board is made up of the 3rd birefringece crystal, and described first birefringece crystal, the second birefringece crystal and the 3rd birefringece crystal kind are different; The selection of bi-material that first and second selected wedge is right and the selection of thickness must meet single order birefringence dispersion compensation condition, selected birefringence plate material and thickness thereof need to coordinate the thickness being operated in zero birefraction phase place place with first and second selected wedge and also meets single order birefringence dispersion compensation condition, to make bandwidth of operation optimization.
2. broadband double-refraction phase compensator as claimed in claim 1, is characterized in that, be fixed together after described 3rd wedge and the second wedge are arranged in the same way, thus can press fixing proportion adjustment first wedge easily to the thickness right with the second wedge.
3. broadband double-refraction phase compensator as claimed in claim 1, it is characterized in that, described first wedge depends on the ratio μ of the first wedge to the variation in thickness right with the second wedge to the angle of wedge right with the second wedge, and tg (α
a)/tg (α
b)=μ, wherein α
abe the angle of wedge of the second wedge, α
bit is the angle of wedge of the 3rd wedge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504072.5A CN103558688B (en) | 2013-10-23 | 2013-10-23 | A kind of broadband double-refraction phase compensator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310504072.5A CN103558688B (en) | 2013-10-23 | 2013-10-23 | A kind of broadband double-refraction phase compensator |
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| Publication Number | Publication Date |
|---|---|
| CN103558688A CN103558688A (en) | 2014-02-05 |
| CN103558688B true CN103558688B (en) | 2015-10-28 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948748B (en) * | 2020-08-26 | 2022-06-24 | 福建福晶科技股份有限公司 | Ultraviolet broadband achromatic compensator |
| CN112099126B (en) * | 2020-10-13 | 2022-06-24 | 福建福晶科技股份有限公司 | 600-once-used 2700nm waveband achromatic half-wave plate |
| CN112255779B (en) * | 2020-11-27 | 2022-05-24 | 中国科学院微电子研究所 | Large-caliber compact type Soire-Babinet compensator device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193744A (en) * | 1996-08-29 | 1998-09-23 | 中国科学院长春物理研究所 | Color filter with negative double refraction |
| CN1609955A (en) * | 2003-10-24 | 2005-04-27 | 上海乐金广电电子有限公司 | Polarized light phase compensating element and optical recording broadcaster with the same element |
-
2013
- 2013-10-23 CN CN201310504072.5A patent/CN103558688B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193744A (en) * | 1996-08-29 | 1998-09-23 | 中国科学院长春物理研究所 | Color filter with negative double refraction |
| CN1609955A (en) * | 2003-10-24 | 2005-04-27 | 上海乐金广电电子有限公司 | Polarized light phase compensating element and optical recording broadcaster with the same element |
Non-Patent Citations (2)
| Title |
|---|
| Phase-shifting lateral shearing interferometer with two pairs of wedge plates;Hyun-Ho Lee等;《OPTICS LETTERS》;20031115;第28卷(第22期);第2243－2245页 * |
| 带法拉第旋转镜迈克尔逊干涉仪的设计与改进研究;王喜龙等;《舰船电子工程》;20100630;第30卷(第6期);第173－176页 * |
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| CN103558688A (en) | 2014-02-05 |
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Granted publication date: 20151028 Termination date: 20181023 |