Tunability of the free-spectral range by microwave injection into a mid-infrared quantum cascade laser

• Main Authors: Rodriguez, Etienne, Mottaghizadeh, Alireza, Gacemi, Djamal, Jeannin, Mathieu, Asghari, Zahra, Vasanelli, Angela, Todorov, Yanko, Wang, Qi Jie, Sirtori, Carlo
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2021
• Subjects: Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics; Injection Locking; Mid-infrared Region
• Online Access: https://hdl.handle.net/10356/147858
• Institution: Nanyang Technological University

The free-spectral range (FSR) of quantum cascade lasers (QCLs) emitting at 4.7 µm can be tuned through direct microwave modulation. The intrinsic short carrier lifetime of inter-subband transitions, along with impedance matched electrical packaging, allows a high-speed modulation up to more than 30 ...