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Proceedings Paper

Electro-optic illuminating module
Author(s): Ales A. Pesl
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Paper Abstract

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.

Paper Details

Date Published: 1 February 1991
PDF: 7 pages
Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991); doi: 10.1117/12.28045
Show Author Affiliations
Ales A. Pesl, Krizik Co. (Czech Republic)


Published in SPIE Proceedings Vol. 1454:
Beam Deflection and Scanning Technologies
Leo Beiser; Gerald F. Marshall, Editor(s)

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