Conoscopic interferometry is applied for determining the crystal orientation of lithium niobate and other commonly employed substrate wafers for integrated-optic and surface-acoustic-wave devices. The method is particularly applicable for detecting the orientation of the optic axes of the strongly birefringent niobate but is less sensitive for lithium tantalate or quartz. Conoscopic interference is a low-cost and easy-to-use method that is especially suitable for laboratory usage.
© 1999 Optical Society of America
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(160.3730) Materials : Lithium niobate
(260.1180) Physical optics : Crystal optics
(260.1440) Physical optics : Birefringence
Pekka H. Äyräs, Ari T. Friberg, Matti A. J. Kaivola, and Martti M. Salomaa, "Conoscopic Interferometry of Surface-Acoustic-Wave Substrate Crystals," Appl. Opt. 38, 5399-5407 (1999)