Effect of thermal carrier spreading on the temperature dependence of threshold current in InP quantum dot lasers

Smowton, Peter Michael ORCID: https://orcid.org/0000-0002-9105-4842, Elliott, Stella N., Kasim, M. and Krysa, A. B. 2015. Effect of thermal carrier spreading on the temperature dependence of threshold current in InP quantum dot lasers. Presented at: Novel In-Plane Semiconductor Lasers XIV, San Francisco, CA, USA, 7 Feb 2015. Published in: Belyanin, Alexey A. and Smowton, Peter Michael eds. Proc. SPIE 9382, Novel In-Plane Semiconductor Lasers XIV, 93820F (March 10, 2015). , vol.9382 The International Society for Optical Engineering, 93820F. 10.1117/12.2086985

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Abstract

the magnitude of the change in threshold current with temperature in InP quantum dot lasers caused by the distribution of carriers among dot states is quantified and demonstrated. Samples with differing distributions of allowed states, as assessed using absorption spectra and achieved by varying the composition of the quantum well above each layer of quantum dots, are affected differently by this thermal broadening although the underlying mechanism is the same. This difference is shown to be a result of different optical loss and the different gain magnitude achieved at a similar inversion level in the different samples. Uncoated, cleaved facet Fabry-Perot lasers with 2 mm long cavities are demonstrated with a threshold current density of 138 Acm-2 at 300 K that increases to 235 Acm-2 at 350 K (77ºC).

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	The International Society for Optical Engineering
ISSN:	0277-786X
Funders:	EPSRC
Last Modified:	28 Oct 2022 09:06
URI:	https://orca.cardiff.ac.uk/id/eprint/73329

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