Current and frequency modulation characteristics for continuous-wave quantum cascade lasers at 9.06 μm

Lei Tao; Kang Sun; David J Miller; M Amir Khan; Mark A Zondlo

doi:10.1364/OL.37.001358

Current and frequency modulation characteristics for continuous-wave quantum cascade lasers at 9.06 μm

Opt Lett. 2012 Apr 15;37(8):1358-60. doi: 10.1364/OL.37.001358.

Authors

Lei Tao¹, Kang Sun, David J Miller, M Amir Khan, Mark A Zondlo

Affiliation

¹ Department of Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, USA.

PMID: 22513685
DOI: 10.1364/OL.37.001358

Abstract

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 validation with a numerical model.