Journal
OPTICS LETTERS
Volume 42, Issue 19, Pages 3888-3891Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.003888
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Funding
- Defense Advanced Research Projects Agency (DARPA) [W31P4Q-16-1-0001]
- National Science Foundation (NSF)
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1505733] Funding Source: National Science Foundation
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Frequency combs based on quantum cascade lasers (QCLs) are finding promising applications in high-speed broad-band spectroscopy in the terahertz regime, where many molecules have their fingerprints. To form stable combs in QCLs, an effective control of group velocity dispersion plays a critical role. The dispersion of the QCL cavity has two main parts: a static part from the material and a dynamic part from the intersubband transitions. Unlike the gain, which is clamped to a fixed value above the lasing threshold, dispersion associated with the intersubband transitions changes with bias, even above the threshold, and this reduces the dynamic range of comb formation. Here, by incorporating tunability into the dispersion compensator, we demonstrate a QCL device exhibiting comb operation from I-th to I-max, which greatly expands the operation range of the frequency combs. (C) 2017 Optical Society of America
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