Laser diode cavity ring-down spectroscopy using acousto-optic modulator stabilization

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365688· OSTI ID:664505

Paldus, B A; Harris, Jr, J S ^[1]; Martin, J; Xie, J; Zare, R N ^[2]

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1. Department of Electrical Engineering, Stanford University, Stanford, California 94305-4070 (United States)
2. Department of Chemistry, Stanford University, Stanford, California 94305-5080 (United States)

By using an acousto-optic modulator, we have stabilized a free-running continuous wave (CW) laser diode in the presence of strong reflections from a high finesse Fabry{endash}Perot resonator. The laser diode linewidth can be stabilized from several MHz, for high resolution spectroscopy of species at low pressures, to several hundred MHz, for lower resolution spectroscopy of species at atmospheric pressures. We demonstrated CW cavity ring-down spectroscopy of water vapor at both 1 atm and 5 Torr. We achieved ring-down repetition rates of 10{endash}50 kHz, and a noise level of 2{times}10{sup {minus}8} cm{sup {minus}1}. {copyright} {ital 1997 American Institute of Physics.}

• DOE Contract Number: FG02-92ER14303
• OSTI ID: 664505
• Journal Information: Journal of Applied Physics, Vol. 82, Issue 7; Other Information: PBD: Oct 1997
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
SEMICONDUCTOR LASERS
STABILIZATION
RING LASERS
WATER
INFRARED SPECTRA
WATER VAPOR
MODULATION
ABSORPTION SPECTROSCOPY
LINE WIDTHS