Generation of 250mW narrowband pulsed ultraviolet light by frequency quadrupling of an amplified erbium-doped fiber laser

Tian Zhong, Xiaolong Hu, Franco N.C. Wong, Karl K. Berggren, Tony D. Roberts, and Philip Battle

Abstract

We demonstrate a high-power, narrowband pulsed source at 390nm by two stages of frequency doubling in periodically poled MgO: LiNbO₃ and periodically poled KTiOPO₄ of an amplified, passively mode-locked fiber laser. With a frequency quadrupling efficiency of 5.5% and a 0.1nm bandwidth, the 250 mW ultraviolet source is a suitable compact pump source for many entanglement-based quantum information processing tasks.