Electrically pumped all photonic crystal 2 nd order DFB lasers arrays emitting at 2.3 μ m

Brice Adelin (1) , Olivier Gauthier-Lafaye (1) , Pascal Dubreuil (2) , Aurélie Lecestre (2) , Y. Rouillard (3, 4) , M. Bahriz (3, 4) , G. Boissier (3, 4) , A. Vicet (3, 4) , Antoine Monmayrant (1)

1 LAAS-PHOTO - Équipe Photonique
2 LAAS-TEAM - Service Techniques et Équipements Appliqués à la Microélectronique
3 IES - Institut d’Electronique et des Systèmes
4 NANOMIR - Composants à Nanostructure pour le moyen infrarouge

Single-mode, widely tunable laser diodes in the mid-infrared range are highly interesting for demanding spectroscopic applications involving multi-species discrimination. We report on an alternative approach using single frequency laser arrays. Single-mode laser arrays were fabricated using all-photonic-crystal electrically pumped distributed feedback cavities on GaSb. The fabricated lasers exhibit thresholds in the 3.2 kA/cm2 range in a continuous wave regime at room temperature. The maximum output power reaches 1 mW and single mode operation with a side-mode suppression ratio of 30 dB is demonstrated. These lasers were used to perform tunable diode laser absorption spectroscopy of several gases in standard gas cells. Continuous spectral coverage of a 40 nm band using 10 lasers seems an achievable goal using laser arrays with PhC lattice constant variations of 1 nm from laser to laser.

Domaines: Electronique

Brice Adelin, Olivier Gauthier-Lafaye, Pascal Dubreuil, Aurélie Lecestre, Y. Rouillard, et al.. Electrically pumped all photonic crystal 2 nd order DFB lasers arrays emitting at 2.3 μ m. APL Photonics, 2017, 2 (3), pp.036105. ⟨10.1063/1.4978665⟩. ⟨hal-01626954⟩