Monolithic single mode interband cascade lasers with wide wavelength tunability

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 superimposedgratings and two-segment Vernier-tuning. The wavelength selective elements in the two segments were based on specially designed lateral metalgrating structures defined by electron beam lithography. A dual-step dryetch process provided electrical separation between the segments. Individualcurrent 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. Thedevices can be operated in continuous wave mode up to 30  °C with the output powers of 3.5 mW around room temperature.

Source: Applied Physics Letters - November 17, 2016 Category: Physics Authors: M. von Edlinger, R. Weih, J. Scheuermann, L. N ähle, M. Fischer, J. Koeth, M. Kamp and S. Höfling Source Type: research