Open AccessWidely tunable room-temperature continuous-wave optical parametric oscillator based on periodically-poled KTiOPO4
Author(s) -
Kavita Devi,
A. Padhye,
Sukeert,
M. Ebrahim-Zadeh
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.024093
Subject(s) - optical parametric oscillator , optics , materials science , continuous wave , signal beam , grating , signal (programming language) , optoelectronics , nonlinear optics , crystal (programming language) , laser beam quality , laser , beam (structure) , physics , wavelength , laser beams , computer science , programming language
We report the first realization of widely tunable continuous-wave (cw) optical parametric oscillator (OPO) based on periodically-poled KTiOPO 4 (PPKTP) at room temperature. By exploiting fan-out grating design in a 30-mm PPKTP crystal, and configured in an output-coupled singly-resonant oscillator (OC-SRO) configuration pumped at 532 nm in the green, the OPO provides finely tunable radiation across 741-922 nm in the signal and 1258-1884 nm in the idler, at a fixed temperature of 25 °C. The use of output coupling for the signal wave enables enhancement of OPO extraction efficiency to 30%, providing a maximum total output power of 1.65 W (450 mW of signal at 901 nm and 1.2 W of idler at 1299 nm) for 5.5 W of pump power. The output idler exhibits passive power stability better than 3.2% rms over >2 mins, and the extracted signal exhibits frequency stability of 194 MHz over more than 35 seconds, in excellent beam quality. The OPO performance in pure SRO configuration has also been investigated.