title: Upconversion blue laser by intracavity frequency self-doubling of periodically poled lithium tantalate parametric oscillator.
abstract: We report a design for upconversion 435 nm blue lasers based on simultaneously fulfilling the nonlinear processes of optical parametric oscillation (OPO) and second-harmonic generation (SHG) in a 7.9 mum periodically poled lithium tantalate (PPLT). The uncoated 15-mm-long PPLT device exhibits a low threshold of 150 mW and a differential slope efficiency of 22.6%, rendering 56 mW blue generation when pumped by a pulsed 532 nm green laser with an average power rating of 400 mW. These observations were attributed to a quasi-phase-matching (QPM) structural design with a 75% domain duty cycle to ensure the concurrence of frequency doubling with the first-order QPM-OPO PPLT device via the second-order QPM-SHG process.
authors.affiliation: Department of Electronic Engineering, Ming Chuan University, Taoyuan, Taiwan.
authors.forename: C-M
authors.initials: CM
authors.lastname: Lai
authors.forename: I-N
authors.initials: IN
authors.lastname: Hu
authors.forename: Y-Y
authors.initials: YY
authors.lastname: Lai
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Huang
authors.forename: L-H
authors.initials: LH
authors.lastname: Peng
authors.forename: A
authors.initials: A
authors.lastname: Boudrioua
authors.forename: A-H
authors.initials: AH
authors.lastname: Kung