Active wavelength control of an external cavity quantum cascade laser

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6 Scopus citations


We present an active wavelength control system for grating-based external cavity lasers that increases the accuracy of predicting the lasing wavelength based on the grating equation and significantly improves scan-to-scan wavelength/frequency repeatability. The ultimate 3σ precision of a frequency scan is determined by the scan-to-scan repeatability of 0.042 cm -1. Since this control method can be applied to any external cavity laser with little to no modification, such a precision provides an excellent opportunity for spectroscopic applications that target molecular absorption lines at standard atmospheric conditions.

Original languageEnglish (US)
Pages (from-to)415-421
Number of pages7
JournalApplied Physics B: Lasers and Optics
Issue number3
StatePublished - Nov 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physics and Astronomy (miscellaneous)


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