Namjou K, Cai S, Whittaker E A, Faist J, Gmachl C, Capasso F, Sivco D L, Cho A Y
Opt Lett. 1998 Feb 1;23(3):219-21. doi: 10.1364/ol.23.000219.
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(2) in a 1-m path length.
我们报告了我们认为首次使用室温量子级联分布反馈激光器进行的光谱测量。利用波长调制光谱，我们在8微米附近的化学指纹波长范围内检测到了N₂O和CH₄。我们测量的噪声等效吸光度为10⁵分之5，受激光输出上过量幅度调制的限制，这对应于在1米光程长度下，在10⁹分之N₂中1赫兹带宽检测极限为250分之N₂O。
