METHOD FOR SUM FREQUENCY GENERATION, METHOD FOR GENERATING VARIABLE WAVELENGTH LASER BEAM AND METHOD FOR DIFFERENCE ABSORPTION LASER RADAR MEASUREMENT USING THE SAME, SUM FREQUENCY GENERATION APPARATUS, AND VARIABLE WAVELENGTH LASER APPARATUS AND DIFFERENCE ABSORPTION LASER RADAR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To increase sum frequency output energy.;SOLUTION: This method for sum frequency generation for obtaining sum frequency output 3 by inputting two light beams and 2 to nonlinear crystals 2 and 3 adds a nonlinear coefficient corresponding to a direction orthogonally crossing the polarization direction of the sum frequency output 3 to an effective nonlinear coefficient corresponding to a direction parallel to the polarization direction of the sum frequency output 3, and arranges the nonlinear crystals 2 and 3 rotated by arranging angles ₁ and ₂ with respect to the polarization direction of the two light beams and 2 so as to maximize the added result.;COPYRIGHT: (C)2003,JPO