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Proceedings Paper

High performance 5.6μm quantum cascade lasers
Author(s): M. Suttinger; R. Go; P. Figueiredo; A. Todi; Hong Shu; A. Lyakh
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Paper Abstract

5.6 μm quantum cascade lasers based on Al 0.78 In 0.22 As/In 0.69 Ga 0.31 As active region composition with measured pulsed room temperature wall plug efficiency of 28.3% are reported. Injection efficiency for the upper laser level of 75% was measured for the new design by testing devices with variable cavity length. Threshold current density of 1.7kA/cm2 and slope efficiency of 4.9W/A were measured for uncoated 3.15mm × 9μm lasers. Threshold current density and slope efficiency dependence on temperature in the range from 288K to 348K for the new structure can be described by characteristic temperatures T0 ~ 140K and T1 ~710K, respectively. Experimental data for inverse slope efficiency dependence on cavity length for 15-stage quantum cascade lasers with the same design are also presented. When combined with the 40-stage device data, the new data allowed for separate evaluation of the losses originating from the active region and from the cladding layers of the laser structure. Specifically, the active region losses for the studied design were found to be 0.77 cm-1, while cladding region losses - 0.33 cm-1. The data demonstrate that active region losses in mid wave infrared quantum cascade lasers largely define total waveguide losses and that their reduction should be one of the main priorities in the quantum cascade laser design.

Paper Details

Date Published: 20 February 2017
PDF: 8 pages
Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 101230R (20 February 2017); doi: 10.1117/12.2250922
Show Author Affiliations
M. Suttinger, Univ. of Central Florida (United States)
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
R. Go, Univ. of Central Florida (United States)
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
P. Figueiredo, Univ. of Central Florida (United States)
A. Todi, Univ. of Central Florida (United States)
Hong Shu, Univ. of Central Florida (United States)
A. Lyakh, Univ. of Central Florida (United States)
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 10123:
Novel In-Plane Semiconductor Lasers XVI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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