Integrated widely tunable quantum cascade lasers with super-structure gratings
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Volume
9002
Date Issued
2014
Author(s)
Abstract
An integrated widely wavelength tunable mid-IR source is demonstrated. This three-section quantum cascade laser consists of a Fabry-Perot section placed between two super-structure grating (SSG) sections. The emission wavelength of the SSG-DBR QCL can be well controlled by varying the injection currents to the two grating sections of the device. The wavelength can be tuned from 4.58 μm to 4.77 μm (90 cm-1) with a supermode spacing of 30 nm. The SSG-DBR QCL can be a compact replacement for the external cavity QCL. It has great potential to achieve much further tuning ranges for many mid-IR sensing applications.
SDGs
Type
conference paper