title: Precision and broadband frequency swept laser source based on high-order modulation-sideband injection-locking.
abstract: A precision and broadband laser frequency swept technique is experimentally demonstrated. Using synchronous current compensation, a slave diode laser is dynamically injection-locked to a specific high-order modulation-sideband of a narrow-linewidth master laser modulated by an electro-optic modulator (EOM), whose driven radio frequency (RF) signal can be agilely, precisely controlled by a frequency synthesizer, and the high-order modulation-sideband enables multiplied sweep range and tuning rate. By using 5th order sideband injection-locking, the original tuning range of 3 GHz and tuning rate of 0.5 THz/s is multiplied by 5 times to 15 GHz and 2.5 THz/s respectively. The slave laser has a 3 dB-linewidth of 2.5 kHz which is the same to the master laser. The settling time response of a 10 MHz frequency switching is 2.5 µs. By using higher-order modulation-sideband and optimized experiment parameters, an extended sweep range and rate could be expected.
authors.forename: Fang
authors.initials: F
authors.lastname: Wei
authors.forename: Bin
authors.initials: B
authors.lastname: Lu
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Dan
authors.initials: D
authors.lastname: Xu
authors.forename: Zhengqing
authors.initials: Z
authors.lastname: Pan
authors.forename: Dijun
authors.initials: D
authors.lastname: Chen
authors.forename: Haiwen
authors.initials: H
authors.lastname: Cai
authors.forename: Ronghui
authors.initials: R
authors.lastname: Qu