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1 February 1991 Electro-optic illuminating module
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There are some limiting factors in a transmission film copy mostly caused by mechanically moving parts. The subject of this paper is a new design of the electro-optic modulator for temporal scanning of light with both spectral and intensity modulations. A cube-formed module with a pair of electro-optic phase retarders processes not only the amplitude of an electromagnetic wave but also its polarization state. Thus an electro-optic modulator operating at Mc temporal sampling of (a) color range (blue, green, red), and (b) that enables intensity modulation of each color in 73 levels used in a transmission film copy is to be developed. A great number of characteristics must be fulfilled by electro-optic crystals for this particular application - namely, (a) broad spectral transmittance over the whole visible range, (b) reasonably high value of electro-optic constant, (c) short relaxation time, (d) low tangent loss, and (e) low deformation coefficients. Analysis of some materials for electro-optic modulators is stated in a sequence to the final concept with crystals performing double Pockels effect (DPE) and reaching the criteria mentioned above, particularly crystals of 23 and 43m groups of symmetry.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ales A. Pesl "Electro-optic illuminating module", Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991);

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