Single-mode interband cascade lasers emitting below 2.8  μ m

In this work, single-mode distributed feedback (DFB) interband cascade laser (ICL) devices with record short wavelength emission below 2.8 μm are presented. Pulsed measurements based on broad area laser devices with a cavity of 2 mm length and 150 μm width showed threshold current densities of 383 A...

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Bibliographic Details
Published in:Applied physics letters 2015-04, Vol.106 (16)
Main Authors: Scheuermann, Julian, Weih, Robert, von Edlinger, Michael, Nähle, Lars, Fischer, Marc, Koeth, Johannes, Kamp, Martin, Höfling, Sven
Format: Article
Language:English
Subjects:
Applied physics
Cascade lasers
Continuous radiation
Devices
Emission
Threshold currents
Tuning
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Summary:In this work, single-mode distributed feedback (DFB) interband cascade laser (ICL) devices with record short wavelength emission below 2.8 μm are presented. Pulsed measurements based on broad area laser devices with a cavity of 2 mm length and 150 μm width showed threshold current densities of 383 A/cm2 at T = 20 °C and a characteristic temperature T0 of 67 K. Fabricated DFB devices were operated in continuous wave mode at room temperature, with threshold currents of 57 mA and demonstrated side mode suppression ratios of larger than 25 dB. The devices showed current tuning ranges of 7 nm and total (including drive current and temperature) tuning ranges of 12 nm, with respective tuning rates of 21 nm/W, 0.13 nm/mA and 0.29 nm/K. Using the full spectral gain bandwidth of the underlying ICL material, single-mode DFB emission was observed within a wavelength range of 150 nm utilizing different DFB grating periods.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4918985