Sensitive absorption spectroscopy with a room-temperature distributed-feedback quantum-cascade laser.

@article{Namjou1998SensitiveAS,
  title={Sensitive absorption spectroscopy with a room-temperature distributed-feedback quantum-cascade laser.},
  author={Khosrow Namjou and Sidong Cai and Edward Whittaker and J{\'e}r{\^o}me Faist and Claire Gmachl and Federico Capasso and Deborah L. Sivco and Alfred Y. Cho},
  journal={Optics letters},
  year={1998},
  volume={23 3},
  pages={219-21}
}
We report what we believe are the first spectroscopic measurements to be made with a room-temperature quantum-cascade distributed-feedback laser. Using wavelength modulation spectroscopy, we detected N(2)O and CH(4) in the chemical fingerprint wavelength range near 8microm . The noise equivalent absorbance for our measurement was 5 parts in 10(5), limited by excess amplitude modulation on the laser output, which corresponds to a 1-Hz bandwidth detection limit of 250 parts N(2)O in 10(9) parts N… CONTINUE READING

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