S.G.Grechin, V.G.Dmitriev, V.A.D'yakov, V.I.Pryalkin
"Anomalously temperature-noncritical phase matching in frequency conversion in nonlinear crystals"
Quantum Electronics (Rus.), 1998, v.25, N11, p.963-964

      For the first time theoretically the existence of a temperature uncritical phase-matching for second harmonic generation in nonlinear crystals was discovered and experimentally corroborated. Experimentally in potassium-titanyl-phosphate crystal (KTP) with length 7,7 mm at 1064,2 nm wavelength the bandwidth of temperature tuning curve about 210 oС was obtained.

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