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VOLUME 27 (1978) | ISSUE 3 | PAGE 185
Active spectroscopy of noncentrosymmetric crystals under conditions of double ω-k resonance
A new modification is investigated of spectroscopy of three-wave mixing of the type 2ωι-ω2—+ωα, wherein wave-resonance (synchronism) conditions are realized for second-harmonic generation in addition to the conditions of Raman frequency resonance. The possibility of measuring the magnitudes and signs of the resonant and nonresonant cubic nonlinearities of a crystal is demonstrated with lithium-formiate as an example.