Open AccessPicosecond tunable gain-switched blue pulses from GaN laser diodes with nanosecond current injections
Author(s) -
Shaoqiang Chen,
Takahiro Nakamura,
Takashi Ito,
Xumin Bao,
Hidekazu Nakamae,
Guoen Weng,
Xiaobo Hu,
Masahiro Yoshita,
Hidefumi Akiyama,
Jianping Liu,
Masao Ikeda,
Hui Yang
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.013046
Subject(s) - nanosecond , materials science , optics , pulse duration , picosecond , laser , optoelectronics , diode , pulse (music) , bandwidth limited pulse , semiconductor laser theory , voltage , pulse width modulation , q switching , ultrashort pulse , physics , detector , quantum mechanics
We investigated the gain-switching properties of GaN-based ridge-waveguide lasers on free-standing GaN substrates with low-cost nanosecond current injection. It was observed that the output pulses with intense injection consisted of an isolated short pulse with a duration of around 50 ps at the high-energy side and a long steady-state component at the lower energy side independent of the electric pulse duration. The energy separation between the short pulse and steady-state component can be over 30 meV, favoring short-pulse generation with the spectral filtering technique. The duration of the steady-state component can be tuned freely by controlling the duration and voltage of the electric pulse, which is very useful for generating pulse-width-tunable optical pulses for various applications.