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

被引：250
|
作者：
Namjou, K [1 ]
Cai, S
Whittaker, EA
Faist, J
Gmachl, C
Capasso, F
Sivco, DL
Cho, AY
机构：
[1] Stevens Inst Technol, Dept Phys & Engn Phys, Hoboken, NJ 07030 USA
[2] Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA
来源：
OPTICS LETTERS | 1998年 / 23卷 / 03期
关键词：
D O I：
10.1364/OL.23.000219
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 N2O and CH4 in the chemical fingerprint wavelength range near 8 mu m. 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 N2O in 10(9) parts N-2 in a 1-m path length. (C) 1998 Optical Society of America.
引用
收藏
页码：219 / 221
页数：3
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