10.1364/OE.23.004173.m001 Yongrui Wang Yongrui Wang Alexey Belyanin Alexey Belyanin Media 1: Active mode-locking of mid-infrared quantum cascade lasers with short gain recovery time Optica Publishing Group 2015 mid-infrared quantum cascade lasers media Optics Express 23 February 2015 mode-locking oe gain recovery time 2015-02-23 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_1_Active_mode-locking_of_mid-infrared_quantum_cascade_lasers_with_short_gain_recovery_time/4949138 Originally published in Optics Express on 23 February 2015 (oe-23-4-4173)