Trace gas detection by laser intracavity photothermal spectroscopy

Journal Article · Sat Mar 01 00:00:00 EST 1986 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.25.000749· OSTI ID:6016105

Fung, K H; Lin, H h

A novel laser intracavity photothermal detector is described. In this scheme, sample absorption of the pump laser power takes place within the cavity of a probe He-Ne laser causing modulation in the gain and in turn the output power. Comparison of this intracavity detector with two other photothermal techniques, namely, phase fluctuation optical heterodyne spectroscopy and thermal beam deflection, is made in terms of practicality and sensitivity. For in situ measurements, sensitivity of 0.5 x 10/sup -7/ cm/sup -1/ for a probe length of 3 cm has been achieved.

• Research Organization: Brookhaven National Laboratory, Department of Applied Science, Environmental Chemistry Division, Upton, New York 11973
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6016105
• Journal Information: Appl. Opt.; (United States), Vol. 25:5
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
ABSORPTION SPECTROSCOPY
SENSITIVITY
TEMPERATURE EFFECTS
LASER SPECTROSCOPY
FLUCTUATIONS
FLUORESCENCE
GAIN
HELIUM-NEON LASERS
NITROGEN
QUANTITY RATIO
SULFUR FLUORIDES
AMPLIFICATION
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
GAS LASERS
HALIDES
HALOGEN COMPOUNDS
LASERS
LUMINESCENCE
NONMETALS
SPECTROSCOPY
SULFUR COMPOUNDS
VARIATIONS
440300* - Miscellaneous Instruments- (-1989)