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Optical frequency translation of pulses from a mode-locked laser is described and demonstrated experimentally. The laser beam is passed through a crystal of LiNbO3 whose refractive index is made to change sinusoidally at the mode-locked laser round-trip frequency (56 Mc/sec). A Doppler shift of the laser light results. Shifts of ±2.4 Gc/sec have been observed. The scheme may be capable of producing shifts as large as ±1000 Gc/sec.
Duguay et al. (1966) studied this question.