Design, fabrication and characterisation of monolithic, optically-coupled, multi-section mid-IR quantum cascade lasers

In this work design, fabrication and characterization of multi-section, coupled cavity mid-IR quantum cascade lasers is presented. To achieve stable, single mode emission 3-section coupled cavity QCL design is proposed. Devices allow tuning of ~3 cm
⁻¹
with 35 dB side mode suppression ratio.