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We describe the single-beam optical trapping of microscopic KTiQPO(4) crystals, using Nd:YAG and Ti:Al(2)O(3) lasers. The high power density of the laser beam at the crystals to be trapped induces the second-harmonic and sumfrequency generation. By changing the wavelength of the Ti:Al(2)O(3) laser, we detect the sum-frequency generation with the fixed wavelength of Nd:YAG laser between 430 and 486 nm for the particle during the trapping.
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Sato et al. (1994) studied this question.
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