Wavelength selection for quantum cascade lasers by cavity length

Christina Young, Richard Cendejas, Scott S. Howard, Wendy Sanchez-Vaynshteyn, Anthony J. Hoffman, Kale J. Franz, Yu Yao, Boris Mizaikoff, Xiaojun Wang, Jenyu Fan, Claire F. Gmachl

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Abstract

A systematic shift in spectral emission wavenumbers in quantum cascade lasers (QCLs) is observed over a variation in cavity lengths from 0.5 to 3 mm resulting in a gain peak shift ranging from 2404 to 2286 cm -1. Thereby, a wavelength selection range of 118 cm-1 is provided, which is sufficiently broad for selecting the laser emission across the entire CO 2absorption band at 2326 cm -1 (4.3 μm). In contrast to current QCL wavelength selection techniques, modifying the cavity length is a straightforward postprocessing procedure. Experimental evidence confirms that this frequency shift is due to a change in threshold voltage and applied electric field as a function of cavity length which is in agreement with the theory.

Original languageEnglish (US)
Article number091109
JournalApplied Physics Letters
Volume94
Issue number9
DOIs
StatePublished - Mar 18 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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