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Spectral Lineshape Measurements with Shot-Noise Limited Accuracy | | Gar-Wing Truong
; James D. Anstie
; Eric F. May
; Thomas M. Stace
; Andre N. Luiten
; | | Date: |
15 Mar 2012 | | Abstract: | Spectroscopy has played the key role in revealing, and thereby understanding,
the structure of atoms and molecules. A central drive in this field is the
pursuit of higher precision and accuracy so that ever more subtle effects might
be discovered. Here, we report on laser absorption spectroscopy that operates
at the conventional quantum limit imposed by photon shot-noise. Furthermore, we
achieve this limit without compromising the accuracy of the measurement. We
demonstrate these properties by recording an absorption profile of cesium vapor
at the 2 parts-per-million level. The extremely high signal-to-noise ratio
allows us to directly observe the homogeneous lineshape component of the
spectral profile, even while in the presence of Doppler broadening that is a
factor of 100 times wider. We can do this because we can precisely measure the
spectral profile at a frequency detuning more than 200 natural linewidths from
the line center. We use the power of this tool to demonstrate direct
measurements of a low-intensity optically-induced broadening process that is
quite distinct from the well-known power broadening phenomenon. | | Source: | arXiv, 1203.3338 | | Services: | Forum | Review | PDF | Favorites | |
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