Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Air-clad fibers: pump absorption assisted by chaotic wave dynamics?   Wave chaos is a concept which has already proved its practical usefulness in
design of double-clad fibers for cladding-pumped fiber lasers and fiber
amplifiers. In general, classically chaotic geometries will favor strong pump
absorption and we address the extent of chaotic wave dynamics in typical
air-clad geometries. While air-clad structures supporting sup-wavelength convex
air-glass interfaces (viewed from the high-index side) will promote chaotic
dynamics we find guidance of regular whispering-gallery modes in air-clad
structures resembling an overall cylindrical symmetry. Highly symmetric
air-clad structures may thus suppress the pump-absorption efficiency eta below
the ergodic scaling law eta proportional to Ac/Acl, where Ac and Acl are the
areas of the rare-earth doped core and the cladding, respectively.

18
The categories of this paper are: econ
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph