Abstract
Chirped laser dispersion spectroscopy (CLaDS) utilizing direct modulation of a quantum cascade laser (QCL) is presented. By controlling the laser bias nearly single- and dual-sideband CLaDS operation can be realized in an extremely simplified optical setup with no external optical modulators. Capability of direct single-sideband modulation is a unique feature of QCLs that exhibit a low linewidth enhancement factor. The developed analytical model shows excellent agreement with the experimental, directly modulated CLaDS spectra. This method overcomes major technical limitations of mid-infrared CLaDS systems by allowing significantly higher modulation frequencies and eliminating optical fringes introduced by external modulators.
Original language | English (US) |
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Article number | 191107 |
Journal | Applied Physics Letters |
Volume | 103 |
Issue number | 19 |
DOIs | |
State | Published - Nov 4 2013 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)