Ra. Haas, INFLUENCE OF A CONSTANT-TEMPERATURE GRADIENT ON THE SPECTRAL BANDWIDTH OF 2ND-HARMONIC GENERATION IN NONLINEAR CRYSTALS, Optics communications, 113(4-6), 1995, pp. 523-529
Analysis of Type I second-harmonic generation in the quasi-continuous-
wave undepleted-fundamental regime indicates that a constant axial tem
perature gradient significantly increases the tuning spectral-bandwidt
h for fixed crystal orientation. The conversion efficiency spectral di
stribution is analogous to the light intensity spatial distribution in
single-slit diffraction.