Protected Luneburg lens

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G02B 5172

Patent

active

044538014

ABSTRACT:
A Luneburg lens formed on an optical waveguide has a protective coating to assure stable optical characteristics by preventing changes in the focal length due to exposure to surrounding light and/or moisture. The Luneburg lens may be of As.sub.2 S.sub.3 material provided on a Ti in-diffused LiNbO.sub.3 waveguide.

REFERENCES:
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patent: 4273445 (1981-06-01), Thompson et al.
patent: 4297704 (1981-10-01), Marom et al.
patent: 4348074 (1982-09-01), Burns et al.
S. K. Yao, et al., Guided-Wave Optical Thin-Film Luneburg Lenses; Fabrication Technique and Properties, Appl. Optics, 18, 4067 (Dec. 1979).
J. S. Berkes, et al., Photodecomposition of Amorphous As.sub.2 Se.sub.3 and As.sub.2 S.sub.3, J. Appl. Phys., 42, 4908 (Nov. 1971).
R. G. Brandes, et al. Optically Formed Dielectric Gratings in Thick Films of Arsenic-Sulfur Glass, Applied Optics, 9, 1712 Jul. 1970.
Y. Ohmachi and T. Igo, Laser-Induced Refractive-Index Change in As-S-Ge Glasses, App. Phys. Letter, 20,506 (Jun. 1972).
S. K. Yao, Theoretical Model of Thin-Film Deposition Profile with Shadow Effect, J. App. Physc., 50, 3390 (May 1979).
S. K. Yao and D. B. Anderson, Shadow Sputtering Diffraction-Limited Waveguide Luneburg Lenses, App. Physc. Lett. 33,307 Aug. 1978.
S. A. Keneman, et al., Evaporated Films of Arsenic Trisulfide: Dependence of Optical Properties on Light Exposure and Heat Cycling, J. Opt. Soc. Am., 68, 32 (Jan. 1978).

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