Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A continuous wave 10 W cryogenic fiber amplifier at 1015 nm and
  frequency quadrupling to 254 nm   A stable, continuous wave, single frequency fiber amplifier system at 1015 nm
with 10W output power is presented. It is based on a large mode double clad
fiber cooled to liquid nitrogen temperature. The amplified light is frequency
quadrupled to 254 nm and used for spectroscopy of the 6^1S - 6^3P transition in
mercury.

29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg