We report on an IOSA based on a titanium diffused optical waveguide layer in lithium niobate with geodesic lenses. Lenses were designed by the method of Sottini et al but with essential modifications to smooth over regions of extreme curvature. Ray-tracing analysis showed that the deviation from the ideal profile introduced by this smoothing had negligible effect. Several lens fabrication methods were experimentally evaluated -ultrasonic impact grinding, computer-controlled diamond tool grinding and diamond turning, followed by polishing with large area flexible tools, or with small pads under microprocessor time and position control. The most reliable method was diamond turning followed by polishing with a small pad on a specially constructed computer controlled polishing machine. Data is also presented on factors affecting overall spectrum analyser dynamic range such as in-plane scattering and acousto-optic third-order intermodulation.

Date Published: 16 June 1983
PDF: 6 pages
Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); doi: 10.1117/12.934447

Published in SPIE Proceedings Vol. 0369:
Max Born Centenary Conf
M. John Colles; D. William Swift, Editor(s)