Light-driven phase shifter

Details Light-driven phase shifter Light-driven phase shifter

1986-09-19

1990-09-25

Moskowitz, Nelson

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

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.

REFERENCES:
patent: 3790252 (1974-02-01), Pao
patent: 4209690 (1980-06-01), Rentzepis
patent: 4508431 (1985-04-01), Henshaw
patent: 4540244 (1985-09-01), Sincerbox
patent: 4544898 (1985-10-01), Pernich
patent: 4585301 (1986-04-01), Bialkowski
patent: 4597638 (1986-07-01), Chemla
patent: 4626075 (1986-12-01), Chemla
patent: 4630898 (1986-12-01), Jewell
patent: 4632518 (1986-12-01), Jensen
Gagne et al., "Photorefractive Deflection . . . Beams", 9/86, Can. J. Phys., vol. 64, #9, pp. 1116-1120, Abst. Only.

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