Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical vortex coronagraphs on ground-based telescopes   The optical vortex coronagraph is potentially a remarkably effective device,
at least for an ideal unobstructed telescope. Most ground-based telescopes
however suffer from central obscuration and also have to operate through the
aberrations of the turbulent atmosphere. This note analyzes the performance of
the optical vortex in these circumstances and compares to some other designs,
showing that it performs similarly in this situation. There is a large class of
coronagraphs of this general type, and choosing between them in particular
applications depends on details of performance at small off-axis distances and
uniformity of response in the focal plane. Issues of manufacturability to the
necessary tolerances are also likely to be important.

15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci