Diffracting device having distributed bragg reflector and wavele

Details Diffracting device having distributed bragg reflector and wavele Diffracting device having distributed bragg reflector and wavele

1993-07-15

1997-04-08

Lee, John D.

Optical: systems and elements

Optical frequency converter

Dielectric optical waveguide type

359328, 372 22, 385 37, 385122, G02F 137

Patent

active

056193696

ABSTRACT:
A diffracting device consists of a substrate made of LiTaO.sub.3, an optical waveguide extending in a central upper side of the substrate for transmitting 860 nm wavelength coherent light radiated from a semiconductor laser, a plurality of gratings periodically arranged on the optical waveguide at regular intervals, and a covering layer arranged on the gratings and the optical waveguide. The optical waveguide is formed according to a proton-exchange process. The gratings are made of photoresist material having a refractive index N1=1.5 and a high workability, and the gratings are uniformly formed according to an interference-exposure process. Therefore, the photoresist material is patterned without damaging the optical waveguide with reactive ions. The covering layer is made of Ta.sub.2 O.sub.5 having a refractive index N2=2.0. Therefore, periodic change in the refractive index is generated in a periodic structure of the gratings and the covering layer, and a part of the coherent light is reflected by the periodic structure to fix the wavelength of the coherent light radiated from the semiconductor laser.

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