Abstract

Absorption of radiation from an interference pattern formed at the intersection of two laser beams can be used to create a thermal grating in a sample.1 In solvents having a temperature-dependent index of refraction, a volume-index grating results. The grating wave vector is given by K = 2π(sinϕ)/λe for excitation beams of wavelength λe and intersection angle 2ϕ.

© 1984 Optical Society of America

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