PbS quantum dot lasers: towards high quality tuneable emission across the short-wave infrared

Guy L. Whitworth; Mariona Dalmases; Nima Taghipour; Gerasimos Konstantatos

doi:10.1117/12.2621269

20 May 2022 PbS quantum dot lasers: towards high quality tuneable emission across the short-wave infrared

Guy L. Whitworth, Mariona Dalmases, Nima Taghipour, Gerasimos Konstantatos

Proceedings Volume 12141, Semiconductor Lasers and Laser Dynamics X; 121410B (2022) https://doi.org/10.1117/12.2621269
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Lead sulfide (PbS) colloidal quantum dots (CQDs) are a novel infrared gain medium, which can exhibit tunable gain across the short-wave infrared (SWIR); lasing in this material however, remained undemonstrated until recent. Here we present a random-like laser emission from PbS CQDs at 1607 nm using a silica based distributed-feedback structure. We determined this random lasing behavior to arise via heating of the CQDs from the intense pulsed laser source, causing a drift in gain. The effects of the thermal conductivity of the substrate were then explored and were seen to be a critical factor in forming stable DFB lasing. By using an alumina based grating, DFB lasing was demonstrated between 1.55 μm – 1.65 μm with linewidths as low as ~0.9 meV.

Conference Presentation

Citation Download Citation

Guy L. Whitworth, Mariona Dalmases, Nima Taghipour, and Gerasimos Konstantatos "PbS quantum dot lasers: towards high quality tuneable emission across the short-wave infrared", Proc. SPIE 12141, Semiconductor Lasers and Laser Dynamics X, 121410B (20 May 2022); https://doi.org/10.1117/12.2621269

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