Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3193539
Keywords
diffraction gratings; laser tuning; quantum cascade lasers
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Funding
- Quantum Photonics National Center of Competence in Research (NCCR) of the Swiss National Science Foundation
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We present the development of a broad gain quantum cascade active region. By appropriate cascade design and using a symmetric active region arrangement, we engineer a flat gain and increase the total modal gain in the desired spectral range. Grating-coupled external cavity quantum cascade lasers using this symmetric active region are tunable from 7.6 to 11.4 mu m with a peak optical output power of 1 W and an average output power of 15 mW at room-temperature. With a tuning of over 432 cm(-1), this single source covers an emission range of over 39% around the center frequency.
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