Abstract
Widely wavelength-tunable mid-infrared lasers are useful for broadband spectral sensing. Grating-coupled external cavity InAs/InAsSb or GaSb/lnAsSb 3–4μn lasers have been demonstrated with large tuning range.1 This work investigates the wavelength tuning property of InGaAs/InAlAs quantum cascade lasers2 using grating-coupled external cavity. An objective is to determine the optimal condition for threshold and power efficiency as a function of wavelength and temperature.
© 2001 Optical Society of America
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