Frequency conversion in inorganic thin film waveguides by quasi-

Details Frequency conversion in inorganic thin film waveguides by quasi- Frequency conversion in inorganic thin film waveguides by quasi-

1992-09-29

1994-03-15

Gonzalez, Frank

Optical waveguides

Having nonlinear property

385130, 385142, 359326, 359332, G02B 610, G02F 202

Patent

active

052952185

ABSTRACT:
A frequency converter/mixer has a crystalline substrate which supports an inorganic, crystalline, nonlinear optical thin film having a higher index of refraction than the substrate, to form an optical waveguide. Input radiation of frequency .omega..sub.1 which enters the waveguide propagates through the waveguide and exits as radiation having a different frequency .omega..sub.2. The frequency conversion of the input radiation is accomplished by first-order quasi-phase-matching the input and output signals as a result of the periodicity of the sign-alternating nonlinear dielectric susceptibility coefficient of the optical thin film over an active region of the waveguide. A method of first-order quasi-phase-matching is also disclosed.

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