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A criterion for Applying Chalcopyrite Semiconductors to Optical Line Elimination Filters
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1993
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PhotonicsElectrical EngineeringOptical MaterialsAccidental Optical IsotropyEngineeringChalcopyrite SemiconductorsOptical PropertiesNon-linear OpticApplied PhysicsLaser ApplicationsOptical CeramicOptoelectronicsApplying Chalcopyrite SemiconductorsActive Crystal
The optical line elimination filter consisting of a birefringent, optically active crystal and two polarizers has a narrow band at the wavelength of the accidental optical isotropy of crystal. Chalcopyrite semiconductors applicable to this filter are predicted from the contribution of anisotropy of transition intensity to birefringence. CuAlS 2 , AgAlS 2 , AgAlSe 2 , AgAlTe 2 and AgInS 2 are thought to satisfy the condition of the filter, i.e. the accidental optical isotropy. Experimental results show that CuAlS 2 had the optical isotropic wavelength at 378 nm. The dependence of center wavelength of AgIn x Ga 1- x Se 2 filter on x is estimated from the band parameters. The center wavelength of AgIn x Ga 1- x Se 2 filter ( x =0.5) is shown experimentally to be adjusted to the emission line of Nd:YAG laser.