Single-mode interband cascade lasers emitting below 2.8 μm
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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.
Scheuermann , J , Weih , R , von Edlinger , M , Naehle , L , Fischer , M , Koeth , J , Kamp , M & Hoefling , S 2015 , ' Single-mode interband cascade lasers emitting below 2.8 μ m ' Applied Physics Letters , vol 106 , no. 16 , 161103 . DOI: 10.1063/1.4918985
Applied Physics Letters
Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in: Scheuermann, J., Weih, R., von Edlinger, M., Naehle, L., Fischer, M., Koeth, J., Kamp, M., & Hoefling, S. (2015). Single-mode interband cascade lasers emitting below 2.8 μm. Applied Physics Letters, 106(16), , and may be found at http://dx.doi.org/10.1063/1.4918985
Financial support by the European Commission within the WideLase Seventh Framework Programme Project (Grant Agreement No.: 318798) is gratefully acknowledged.
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