Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simple High-Bandwidth Sideband Locking with Heterodyne Readout   We present a robust sideband laser locking technique that is ideally suited
for applications requiring low probe power and heterodyne readout. By feeding
back to a high-bandwidth voltage controlled oscillator, we lock a first-order
phase-modulation sideband to a table-top high-finesse Fabry-Perot cavity,
achieving a feedback bandwidth of 3.5 MHz with a single integrator, limited
fundamentally by the signal delay. The directly measured transfer function of
the closed feedback loop agrees with a model assuming ideal system components,
and from this we suggest a modified design that should realistically achieve a
bandwidth exceeding 6 MHz with a near-causally limited feedback gain of
$4\times 10^7$ at 1 kHz. The off-resonance optical carrier is used for
alignment-free heterodyne readout, alleviating the need for a second laser or
additional optical modulators.

13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat