Light-driven phase shifter

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

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Details

35016211, 350484, 455611, G02B 5172, G02B 636

Patent

active

049589210

ABSTRACT:
A light-driven phase shifter is provided for modulating a transmission light beam. A gaseous medium such as argon is provided with electron energy states excited to populate a metastable state. A tunable dye laser is selected with a wavelength effective to deplete the metastable electron state and may be intensity modulated. The dye laser is directed through the gaseous medium to define a first optical path having an index of refraction determined by the gaseous medium having a depleted metastable electron state. A transmission laser beam is also directed through the gaseous medium to define a second optical path at least partially coincident with the first optical path. The intensity of the dye laser beam may then be varied to phase modulate the transmission laser beam.

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Gagne et al., "Photorefractive Deflection . . . Beams", 9/86, Can. J. Phys., vol. 64, #9, pp. 1116-1120, Abst. Only.

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