Dual-wavelength design of high precision rhomb-type achromatic retarders

LI Guo-liang

doi:10.3969/j.issn.1001-806.2012.04.033

In order to improve the precision of rhomb-type achromatic retarders,according to the optical refraction rule and based on that the sum of the angle of total reflection θ and the reflection angle r is constant,dual-wavelength design was analyzed for two different wavelength beams incident on the retarder.Since the delay errors were the positive and negative,retardation was 90° at two wavelengths in the whole region of spectrum.Simultaneously,achromatic precision of the λ/4 retarder was enhanced greatly after optimum design for two wavelengths.The maximal delay error was smaller than 0.02° for a λ/4 retarder designed with LaK2 glass within the range of 360nm~1160nm.Compared with other two designing methods,the new designed retarder not only simplifies the designing theory,but also has higher achromatic precision,and the results are helpful to the design of high precision rhomb-type achromatic retarders.

Dual-wavelength design of high precision rhomb-type achromatic retarders

1. Department of Physics, Xingyi Normal University for Nationalities, Xingyi 562400, China

Received Date: 2011-09-29

Accepted Date: 2011-12-09

Available Online: 2012-07-25

Abstract: In order to improve the precision of rhomb-type achromatic retarders,according to the optical refraction rule and based on that the sum of the angle of total reflection θ and the reflection angle r is constant,dual-wavelength design was analyzed for two different wavelength beams incident on the retarder.Since the delay errors were the positive and negative,retardation was 90° at two wavelengths in the whole region of spectrum.Simultaneously,achromatic precision of the λ/4 retarder was enhanced greatly after optimum design for two wavelengths.The maximal delay error was smaller than 0.02° for a λ/4 retarder designed with LaK2 glass within the range of 360nm~1160nm.Compared with other two designing methods,the new designed retarder not only simplifies the designing theory,but also has higher achromatic precision,and the results are helpful to the design of high precision rhomb-type achromatic retarders.

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Reference (12)

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Dual-wavelength design of high precision rhomb-type achromatic retarders

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