Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large energy mode locking of an erbium-doped fiber laser with atomic
  layer graphene   We report on large energy pulse generation in an erbium-doped fiber laser
passively mode-locked with atomic layer graphene. Stable mode locked pulses
with single pulse energy up to 7.3 nJ and pulse width of 415 fs have been
directly generated from the laser. Our results show that atomic layer graphene
could be a promising saturable absorber for large energy mode locking.

2
The categories of this paper are: math
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio