Nonlinear frequency conversion optical filter

Details Nonlinear frequency conversion optical filter Nonlinear frequency conversion optical filter

1993-09-20

1994-08-16

Lee, John D.

Optical: systems and elements

Optical frequency converter

G02F 139

Patent

active

053391896

ABSTRACT:
The present invention is a method and system for performing optical filteg. Light energy in one frequency band is received in this system. The received light energy is filtered in one frequency band in order to provide filtered light which is applied to a nonlinear optical device. The nonlinear optical device provides frequency conversion preferably by forming a sum frequency or difference frequency. The frequency converted light energy is in a second frequency band. The energy in this second frequency band is applied to a further filter in a different frequency band wherein the two filter frequency bands are selected to prevent light energy from passing through both filters. The received light energy may contain information which is recoverable from the light energy which passes through the second filter. The nonlinear device is a crystal in which the index of refraction may be changed in order to tune the filter.

REFERENCES:
patent: 4633103 (1986-12-01), Hyman et al.
patent: 4958910 (1990-09-01), Taylor et al.
patent: 5007717 (1991-04-01), Cutolo et al.
patent: 5060085 (1991-10-01), Gelbwachs

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