Tuning visible light generation based on multi-channel quasi-periodically poled LiTaO 3

Abstract

We demonstrate broadband tuning visible light generation based on a multi-channel quasi-periodically poled LiTaO 3 crystal, in which a quasi-phase matched optical parametric generation process and a quasi-phase matched sum-frequency mixing process were achieved simultaneously. The conversion characters on spectrum and energy were studied by using a nanosecond pulse laser at 1.064 μm as pump light. We could tune the visible light over ~ 26 nm by means of changing the crystal's channel and temperature. The ratio of the output wavelength variation to that of temperature was ~ 0.07 nm/°C. The single-pass slope efficiency was 6.3% with the maximum output energy of 25 μJ.