title: Efficient phase-matching for difference frequency generation with pump of Bessel laser beams.
abstract: A type of phase matching for difference frequency generation with Bessel-type pump beams is proposed. In this geometry, the phase matching is achieved in a cone around the laser path by properly controlling the beam profile. An experimental case that 1.5THz generation with ~2μm lasers pumped bulk GaAs crystal is considered. Calculations of the energy conversion characteristics are performed based on a semi-analytical model. The results indicate that this configuration could relax the phase matching condition in a wide range of nonlinear crystals and pump wavelengths.
authors.forename: Pengxiang
authors.initials: P
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Degang
authors.initials: D
authors.lastname: Xu
authors.forename: Xinzheng
authors.initials: X
authors.lastname: Zhang
authors.forename: Guizhong
authors.initials: G
authors.lastname: Zhang
authors.forename: Jianquan
authors.initials: J
authors.lastname: Yao