Abstract
The linewidth of an external cavity quantum cascade laser is studied as a function of injection current and laser scan rate. The laser linewidth is inferred to be ca. 2.5 MHz from Lamb-dip spectra on a low pressure sample of NO and its variation with injection current is well modeled using literature values for the intrinsic material properties of the lasing medium. The laser linewidth measurements are corroborated by polarization spectroscopy studies as well as by analysis of hyperfine structure and cross-over resonances.
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Acknowledgments
This work is conducted under the EPSRC programme grant EP/G00224X/1: New Horizons in Chemical and Photochemical Dynamics. RJW and JK would like to thank the EPSRC for the award of postgraduate studentships.
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Walker, R.J., Kirkbride, J., van Helden, J.H. et al. Sub-Doppler spectroscopy with an external cavity quantum cascade laser. Appl. Phys. B 112, 159–167 (2013). https://doi.org/10.1007/s00340-013-5410-9
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DOI: https://doi.org/10.1007/s00340-013-5410-9