Current and frequency modulation characteristics for continuous-wave quantum cascade lasers at 906 μm

Lei Tao, Kang Sun, David J. Miller, M. Amir Khan, Mark A. Zondlo
2012 Optics Letters  
We report the characteristics of current induced frequency modulation (FM) for two continuous-wave quantum cascade lasers (QCLs) at 9.06 μm. Both the frequency tuning rate and the phase shift between intensity modulation and FM are measured at different modulation frequencies from 10 Hz to 200 kHz. The frequency tuning rate of the QCLs depends on both the modulation frequency and amplitude. The tested QCL has been used to detect ambient water vapor with wavelength modulation spectroscopy for
more » ... spectroscopy for validation with a numerical model.
doi:10.1364/ol.37.001358 pmid:22513685 fatcat:nf33agg6lbg25jlauc5cgrt6n4