Monolithic single mode interband cascade lasers with wide wavelength tunability
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Monolithic two-section interband cascade lasers offering a wide wavelength tunability in the wavelength range around 3.7 μm are presented. Stable single mode emission in several wavelength channels was realized using the concept of binary superimposed gratings and two-segment Vernier-tuning. The wavelength selective elements in the two segments were based on specially designed lateral metal grating structures defined by electron beam lithography. A dual-step dry etch process provided electrical separation between the segments. Individual current control of the segments allowed wavelength channel selection as well as continuous wavelength tuning within channels. A discontinuous tuning range extending over 158 nm in up to six discrete wavelength channels was achieved. Mode hop free wavelength tuning up to 14 nm was observed within one channel. The devices can be operated in continuous wave mode up to 30 °C with output powers of 3.5 mW around room temperature.
von Edlinger , M , Weih , R , Scheuermann , J , Nähle , L , Fischer , M , Koeth , J , Kamp , M & Höfling , S 2016 , ' Monolithic single mode interband cascade lasers with wide wavelength tunability ' Applied Physics Letters , vol 109 , no. 20 , 201109 . DOI: 10.1063/1.4968535
Applied Physics Letters
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at scitation.aip.org / https://dx.doi.org/10.1063/1.4968535
Financial support by the European Union in terms of the WideLase project (grant agreement no: 318798) within the Seventh Framework Programme is gratefully acknowledged.