Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 96, Issue 2-3, Pages 561-566Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-009-3572-2
Keywords
-
Categories
Funding
- Gebert Ruf Stiftung
Ask authors/readers for more resources
Modulated resonant photoacoustics is a sensitive technique widely used for trace gas sensing. Generally, a continuous-wave laser is modulated at a frequency corresponding to an acoustic resonance of a photoacoustic cell. Another mode of operation-which we propose to call the pulsed resonant mode-consists in matching the frequency repetition rate of a pulsed laser to an acoustic resonance of the cell. We present a theoretical model to compare the performance of these two configurations. For a given average power of the incoming light inside the cell, the pulsed resonant mode of operation (nanosecond pulses or shorter) produces pi/2 times higher photoacoustic signals than the modulated resonant scheme (the latter is optimized for a 50% duty cycle). This result agrees with experiments during which both cases were investigated at 532 nm using the same photoacoustic cell containing trace concentrations of NO2.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available