Journal
MATERIALS
Volume 14, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/ma14051112
Keywords
interband cascade laser; optical gain; quantum well; mid-infrared range
Categories
Funding
- Polish National Agency for Academic Exchange
- project SENSE - National Centre for Research and Development [TECHMAT-STRATEG1/347510/15/NCBR/2018]
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Engineering modification of type II quantum wells significantly broadens the optical gain function in the mid-infrared range, offering the possibility for the development of new generation devices.
The optical gain spectrum has been investigated theoretically for various designs of active region based on InAs/GaInSb quantum wells-i.e., a type II material system employable in interband cascade lasers (ICLs) or optical amplifiers operating in the mid-infrared spectral range. The electronic properties and optical responses have been calculated using the eight-band k center dot p theory, including strain and external electric fields, to simulate the realistic conditions occurring in operational devices. The results show that intentionally introducing a slight nonuniformity between two subsequent stages of a cascaded device via the properly engineered modification of the type II quantum wells of the active area offers the possibility to significantly broaden the gain function. A -3 dB gain width of 1 mu m can be reached in the 3-5 mu m range, which is almost an order of magnitude larger than that of any previously reported ICLs. This is a property strongly demanded in many gas-sensing or free-space communication applications, and it opens a way for a new generation of devices in the mid-infrared range, such as broadly tunable single-mode lasers, mode-locked lasers for laser-based spectrometers, and optical amplifiers or superluminescent diodes which do not exist beyond 3 mu m yet.
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