Numerical analysis of near and far field patterns of secondharmonicgeneration with tiling nonlinear optical crystals

摘要

We report numerical analysis of near- and far-field patterns of the second-harmonicrnwave in a large-scale high-power laser used in the laser fusion with type I KDP crystalsrnarranged in a tiling style. The thickness and phase-matching angle of the tiling crystals arerndesigned based on the near-field pattern of the second-harmonic wave. The tilting angle errorrnand thickness difference of the tiling crystals are evaluated by the energy distribution includedrnin the Airy spot of the far-field pattern at the focal point. The parallelism and flatness of therntiling crystals can also be estimated with the same method.