Arts & Sciences Events
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Arts & Sciences
[PAST EVENT] AMO Seminar
July 21, 2015
11am - 12pm
Abstract:
One might naively assume that unavoidable fluctuations in laser frequency, intensity, and
phase are always undesirable in experimental applications. But light-matter interactions
can encode useful information about the medium in the transmitted light?s fluctuations, and
analysis of these fluctuations can actually enhance measurement precision in some cases.
In particular, it is well known that free-running diode lasers have significant phase noise
and that a resonant atomic vapor will convert phase noise into transmitted intensity noise.
A true, but less well-known fact is that intensity noise from orthogonally polarized laser
fields from the same laser source can be either correlated or, rather surprisingly, anticorrelated depending very sensitively on detuning from a resonance. In this talk I will
present noise correlation studies using a single ?noisy? diode laser interacting with
rubidium vapor on a sharp resonance feature from atomic coherence, namely
Electromagnetically Induced Transparency (EIT) in the Hanle configuration. Of particular
interest is a narrow band of perfect correlation that coincides with EIT. The linewidth of
this noise correlation peak has been shown to be power-broadening resistant at low laser
powers. I will present recent experimental noise correlation studies, including power
broadening of this correlation peak at higher powers. This noise correlation technique
holds promise in high-resolution applications such as atomic EIT-noise magnetometry.
One might naively assume that unavoidable fluctuations in laser frequency, intensity, and
phase are always undesirable in experimental applications. But light-matter interactions
can encode useful information about the medium in the transmitted light?s fluctuations, and
analysis of these fluctuations can actually enhance measurement precision in some cases.
In particular, it is well known that free-running diode lasers have significant phase noise
and that a resonant atomic vapor will convert phase noise into transmitted intensity noise.
A true, but less well-known fact is that intensity noise from orthogonally polarized laser
fields from the same laser source can be either correlated or, rather surprisingly, anticorrelated depending very sensitively on detuning from a resonance. In this talk I will
present noise correlation studies using a single ?noisy? diode laser interacting with
rubidium vapor on a sharp resonance feature from atomic coherence, namely
Electromagnetically Induced Transparency (EIT) in the Hanle configuration. Of particular
interest is a narrow band of perfect correlation that coincides with EIT. The linewidth of
this noise correlation peak has been shown to be power-broadening resistant at low laser
powers. I will present recent experimental noise correlation studies, including power
broadening of this correlation peak at higher powers. This noise correlation technique
holds promise in high-resolution applications such as atomic EIT-noise magnetometry.
Contact
ixnovi@wm.edu