Single-mode, distributed feedback interband cascade lasers grown on GaSb and GaAs substrates, emitting at 4.6 µm
Year: 2026
Type: article
Abstract: In this work, single-mode, interband cascade lasers (ICLs) incorporating a metal top-surface distributed feedback (DFB) grating are successfully demonstrated on both native GaSb and lattice-mismatched GaAs substrates. To the best of our knowledge, this work represents the first demonstration of single-mode DFB operation near 4.6 µm from an ICL grown on a lattice-mismatched GaAs substrate. First-order gratings etched into the upper InAs/AlSb cladding are integrated with 6-µm-wide and 2-mm-long ridge waveguides. ICLs are studied under pulsed operation up to 60°C. Comparable performance is achieved for both substrate platforms, with threshold current densities of 500 A/cm 2 at 20 °C. Single mode operation with side mode suppression ratio (SMSR) exceeding 20 dB is obtained for temperatures above 30°C. The devices emit at 4.6 µm, a wavelength relevant for carbon monoxide (CO) spectroscopy.
Source: Optics Express
DOI: 10.1364/oe.614197
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7222938828