Absorption spectroscopy with quantum cascade lasers.
Novel pulsed and cw quantum cascade distributed feedback (QC-DFB) lasers operating near lambda=8 micrometers were used for detection and quantification of trace gases in ambient air by means of sensitive absorption spectroscopy. N2O, 12CH4, 13CH4, and different isotopic species of H2O were detected. Also, a highly selective detection of ethanol vapor in air with a sensitivity of 125 parts per billion by volume (ppb) was demonstrated.
Kosterev
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AA
Rice Quantum Institute, Rice University, Houston, TX 77251-1892, USA. akoster@rice.edu
Curl
R F
RF
Tittel
F K
FK
Gmachl
C
C
Capasso
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F
Sivco
D L
DL
Baillargeon
J N
JN
Hutchinson
A L
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Cho
A Y
AY
D016902:Air Pollution, Indoor / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D000431:Ethanol / Q000032:analysis; D005069:Evaluation Studies as Topic; D005740:Gases / Q000032:analysis; D007834:Lasers; D008697:Methane / Q000032:analysis; D009609:Nitrous Oxide / Q000032:analysis; D011789:Quantum Theory; D013054:Spectrophotometry, Atomic / Q000295:instrumentation*; D013696:Temperature; D014867:Water / Q000032:analysis
D005740:Gases; D014867:Water; D000431:Ethanol; D009609:Nitrous Oxide; D008697:Methane
NASA Discipline Life Sciences Technologies; Non-NASA Center