Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Birefringent atomic vapor laser lock in a hollow cathode lamp   We report a robust method of stabilizing a laser to the frequency of an
atomic transition using a hollow cathode lamp. In contrast to the standard
dichroic atomic vapor laser lock (DAVLL) method, which uses dichroism induced
by a longitudinal magnetic field, we employ birefringence induced by a
transversal magnetic field. We applied this method to the $(5s^2)\ {}^{1}S_{0}
- (5s5p)\ {}^{1}P_{1}$ transition (461 nm) of Sr. Although the hollow cathode
is made of ferromagnetic material, we successfully applied a magnetic field of
sufficient strength to obtain an error signal with a theoretical maximum slope.
This method may be applied to other hollow cathode lamps of different atomic
species.

34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con