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Nonlinear optical interferometer

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Abstract

The interferometer described, based on the second harmonic generation of light, is useful in the contouring of refractive objects with large variations in optical depth. The device is a real-time common-path self-referencing interferometer that yields interferograms in the visible with an equivalent wavelength of the order of 50 μm. We describe experiments that show that it can serve as a useful device. The key to the device is the use of Y-cut LiNbO3 configured for surface acoustooptic applications rather than for conventional second harmonic applications. The crystals are noncritically phase matched by temperature control and are used with a repetitively pulsed Nd:YAG laser operating at 1.06 μm.

© 1982 Optical Society of America

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