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Degenerate and nondegenerate lateral-mode patterns in quantum cascade lasers
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View: Figures


Image of FIG. 1.
FIG. 1.

Spatially resolved spectra for L8 sample at 2 A pump current. (a) General view of the spectrum with three areas of interest; left and top graphs represent the traditional spatially integrated spectrum and spectrally integrated near-field patterns, respectively. (b) Spectrum detail of area 1 demonstrating presence of the fundamental mode. (c) Spectrum detail of area 2 demonstrating atmospheric absorption line near . (d) Spectrum detail of area 3 showing presence of high-order mode. (e) Output facet geometry of the QC lasers in this study, width . Lateral-mode frequency-degeneracy cases measured with two-pass spectrometer configuration. (f) Sample L5 at 2.5 A, degeneracy index , and width . (g) Sample L3 at 2.2 A, degeneracy index , and width . Approximately middle-quarter portions of the laser spectra are shown.

Image of FIG. 2.
FIG. 2.

Lateral-mode maximally nondegenerate cases measured with four-pass grating spectrometer setup. (a) Sample L8 at 2.4 A, width , and blueshifted nondegeneracy with index . (b) Sample L14 at 2.0 A, width , and redshifted nondegeneracy with index . Dotted red lines show the apparent direction of spectral mode dispersion.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Degenerate and nondegenerate lateral-mode patterns in quantum cascade lasers