A near-infrared zero-order achromatic retarder |
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| Authors: | ARIJIT SAHA KALLOL BHATTACHARYA AJOY KUMAR CHAKRABORTY |
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| Institution: | 1.Department of Electronics & Communication Engineering,B.P. Poddar Institute of Management & Technology,Kolkata,India;2.Department of Applied Optics and Photonics,Calcutta University,Kolkata,India |
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| Abstract: | Phase retarders normally show strong wavelength dependence. Achromatic retarders which exhibit nearly identical characteristics
over a wide wavelength spectrum is used in polychromatic light. The present investigation deals with a technique to design
and study the characteristics of an achromatic combination of birefringent plates in 800–2000 nm range. The retarder has been
designed using calcite, crystalline quartz and ADP. The thicknesses of the plates are 19.38 μm, 446.14 μm and 12.57 μm respectively. The new arrangement of three birefringent plates proposed has the promise of producing a zero-order quarter
wave achromatic combination with fairly good accuracy. |
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