Laser modulator for producing dark-pulses

Details Laser modulator for producing dark-pulses Laser modulator for producing dark-pulses

1976-09-29

1977-07-19

Rolinec, Rudolph V.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 883, 332 751, H01S 300

Patent

active

040365549

ABSTRACT:
A dark pulse is manifested when the intensity of a laser beam, for example, a continuous wave laser beam drops to zero and returns to its original intensity in a very short time period. A modulator for producing dark pulse outputs is disclosed which includes a two-photon absorption cell provided with two input laser beams: a continuous wave beam having a frequency .omega..sub.1 and a mode-locked laser beam having a frequency .omega..sub.2 selected such that .omega..sub.1 + .omega..sub.2 = .OMEGA..sub.12 where .OMEGA..sub.12 is also the two-photon absorption frequency of the vapor contained in the cell. The mode locked beam modulates the continuous wave beam to produce the desired dark pulses.

REFERENCES:
patent: 3909749 (1975-09-01), Weber

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