Abstract
THE first observations of second harmonic generation of light (SHG) were made with a high-power pulsed ruby laser. Since then these nonlinear effects have been successfully observed with continuous wave He–Ne gas lasers1. Recently, the so-called aperture effect of SHG, which had been predicted2 and which is equivalent to the familiar phenomenon of double refraction, was experimentally observed3 in long crystals (of length 5 to 10 cm). We report here that SHG double refraction has been detected in thin crystals 1 mm to 2 mm thick, using as an input beam the light from a gas laser.
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References
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SU, LK., HSU, BS. Double Refraction on Optical Second Harmonic in Thin Crystals. Nature 220, 780–781 (1968). https://doi.org/10.1038/220780a0
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DOI: https://doi.org/10.1038/220780a0
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