Open Access88 GHz Q-switched mode-locked waveguide lasers modulated by PtSe2 saturable absorber
Author(s) -
Ziqi Li,
Rang Li,
Chi Pang,
Ningning Dong,
Jun Wang,
Haohai Yu,
Feng Chen
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.27.008727
Subject(s) - saturable absorption , materials science , laser , optics , femtosecond , ultrashort pulse , mode locking , waveguide , pulse duration , optoelectronics , q switching , fiber laser , physics
We demonstrate high-repetition-rate fundamentally Q-switched mode-locked Nd:YAG waveguide laser modulated by platinum diselenide (PtSe 2 ) saturable absorber. The laser operation platform is a femtosecond laser-written monolithic Nd:YAG waveguide, and the saturable absorber is large-area few-layer PtSe 2 that possesses relatively lower saturation intensity and higher modulation depth in comparison with graphene. With the superb ultrafast nonlinear saturable absorption properties of as-synthesized PtSe 2 , the waveguide laser could operate at ~8.8 GHz repetition rate and ~27 ps pulse duration, while maintaining a relatively high slope efficiency of 26% and high stability with signal-to-noise ratio (SNR) up to 54 dB. Our work indicates the promising applications of laser-written Nd:YAG waveguides and atomically thin PtSe 2 for on-chip integration of GHz laser sources toward higher repetition rates and shorter pulse duration.