Abstract
We developed a system for measurements of power spectra of transmitted light intensity fluctuations, in which the extraneous noise, including shot noise, is reduced. In essence, we just apply light, measure the power of the transmitted light, and derive its power spectrum. We use this to observe the spontaneous noise spectra of photon atom interactions. Applying light with frequency modulation, we can also observe the spontaneous noise reflecting the coherence between the hyperfine levels in the excited state. There are two main novel components in the measurement system, the noise reduction scheme and the stabilization of the laser system. The noise reduction mechanism can be used to reduce the shot noise contribution to arbitrarily low levels through averaging, in principle. This is combined with differential detection to keep unwanted noise at low levels. The laser system is stabilized to obtain spectral width below 1 kHz without high frequency (≳10 MHz) noise. These methods are described systematically and the performance of the measurement system is examined through experimental results.
| Original language | English |
|---|---|
| Pages (from-to) | 195-200 |
| Number of pages | 6 |
| Journal | Journal of the Optical Society of America B: Optical Physics |
| Volume | 31 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2014 Feb 1 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Statistical and Nonlinear Physics
Cite this
Noise reduction and hyperfine level coherence in spontaneous noise spectroscopy of atomic vapor. / Mitsui, Takahisa; Aoki, Kenichiro.
In: Journal of the Optical Society of America B: Optical Physics, Vol. 31, No. 2, 01.02.2014, p. 195-200.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Noise reduction and hyperfine level coherence in spontaneous noise spectroscopy of atomic vapor
AU - Mitsui, Takahisa
AU - Aoki, Kenichiro
PY - 2014/2/1
Y1 - 2014/2/1
N2 - We developed a system for measurements of power spectra of transmitted light intensity fluctuations, in which the extraneous noise, including shot noise, is reduced. In essence, we just apply light, measure the power of the transmitted light, and derive its power spectrum. We use this to observe the spontaneous noise spectra of photon atom interactions. Applying light with frequency modulation, we can also observe the spontaneous noise reflecting the coherence between the hyperfine levels in the excited state. There are two main novel components in the measurement system, the noise reduction scheme and the stabilization of the laser system. The noise reduction mechanism can be used to reduce the shot noise contribution to arbitrarily low levels through averaging, in principle. This is combined with differential detection to keep unwanted noise at low levels. The laser system is stabilized to obtain spectral width below 1 kHz without high frequency (≳10 MHz) noise. These methods are described systematically and the performance of the measurement system is examined through experimental results.
AB - We developed a system for measurements of power spectra of transmitted light intensity fluctuations, in which the extraneous noise, including shot noise, is reduced. In essence, we just apply light, measure the power of the transmitted light, and derive its power spectrum. We use this to observe the spontaneous noise spectra of photon atom interactions. Applying light with frequency modulation, we can also observe the spontaneous noise reflecting the coherence between the hyperfine levels in the excited state. There are two main novel components in the measurement system, the noise reduction scheme and the stabilization of the laser system. The noise reduction mechanism can be used to reduce the shot noise contribution to arbitrarily low levels through averaging, in principle. This is combined with differential detection to keep unwanted noise at low levels. The laser system is stabilized to obtain spectral width below 1 kHz without high frequency (≳10 MHz) noise. These methods are described systematically and the performance of the measurement system is examined through experimental results.
UR - http://www.scopus.com/inward/record.url?scp=84898081257&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84898081257&partnerID=8YFLogxK
U2 - 10.1364/JOSAB.31.000195
DO - 10.1364/JOSAB.31.000195
M3 - Article
AN - SCOPUS:84898081257
VL - 31
SP - 195
EP - 200
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
SN - 0740-3224
IS - 2
ER -