Wavelength selection for quantum cascade lasers by cavity length

Young, Christina; Cendejas, Richard; Howard, Scott S.; Sanchez-Vaynshteyn, Wendy; Hoffman, Anthony J.; Franz, Kale J.; Yu Yao; Mizaikoff, Boris; Xiaojun Wang; Jenyu Fan; Gmachl, Claire F.
March 2009
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
Academic Journal
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 CO2 absorption 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.


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