Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of a Tunable-Bandwidth White Light Interferometer using
  Anomalous Dispersion in Atomic Vapor   Recently, the design of a white-light-cavity has been proposed using negative
dispersion in an intra-cavity medium to make the cavity resonate over a large
range of frequencies and still maintain a high cavity build-up. This paper
presents the demonstration of this effect in a free-space cavity. The negative
dispersion of the intra-cavity medium is caused by bi-frequency Raman gain in
an atomic vapor cell. A significantly broad cavity response over a bandwidth
greater than 20 MHz has been observed. The experimental results agree well with
the theoretical model, taking into account effects of residual absorption. A
key application of this device would be in enhancing the sensitivity-bandwidth
product of the next generation gravitational wave detectors that make use of
the so-called signal-recycling mirror.

7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an