Abstract
In velocity measurements by the laser Doppler method, a requirement exists for changing the frequency of one light beam with respect to another derived from the same source. This is particularly useful for the determination of the sign of a velocity. The required frequency shifting or single side-band generation can be accomplished by the use of electro-optical effects and a number of possible arrangements are discussed. Trials were made using Kerr cells and electro-optic crystals and single side-band generation demonstrated by a simple Doppler beating experiment. If a low efficiency can be tolerated as in Doppler beating with a reference beam, the production of a pure frequency shifted beam is not difficult up to frequencies of a few megahertz. The differential Doppler or fringe system however requires shifted and non-shifted beams of equal intensity and hence high efficiency conversion is imperative. Radio-frequency driving power requirements may also be a limitation. The theoretical efficiencies of various multi-cell electro-optic arrangements have been calculated as a function of R.F. excitation. The possible efficiency approaches unity as the number of cells is increased.
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References
H. Cummins, N. Knable, L. Gampel, andY. Yeh,Appl. Phys. Lett. 2 (1963) 62–64.
M. K. Mazumder,ibid 16 (1970) 42.
W. H. Stevenson,Appl. Opt. 9 (1970) 649–652.
D. R. Herriott, US Patent 3,175,088 (1965).
C. F. Buhrer, L. R. Bloom, andD. H. Baird,Appl. Opt. 2 (1963) 839–846.
J. P. Campbell andW. H. Steier,IEEE J. of Quant. Electr. QE7 (1971) 450–457.
F. C. Buhrer, V. J. Fowler, andL. R. Bloom,Proc. IRE 50 (1962) 1827–1828.
J. Peters,Appl. Opt. 4 (1965) 857–861.
P. Page andH. Pursey,Opto-electronics 2 (1970) 1–4.
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Drain, L.E., Moss, B.C. The frequency shifting of laser light by electro-optic techniques. Opto-electronics 4, 429–439 (1972). https://doi.org/10.1007/BF01414146
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DOI: https://doi.org/10.1007/BF01414146