Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lossless reshaping of structured light   Structured light concerns the control of light in its spatial degrees of
freedom (amplitude, phase and polarization), and has proven instrumental in
many applications. The creation of structured light usually involves the
conversion of a Gaussian mode to a desired structure in a single step, while
the detection is often the reverse process, both fundamentally lossy or
imperfect. Here we show how to ideally reshape structured light in a lossless
manner in a simple two-step process. We outline the core theoretical arguments,
and demonstrate reshaping of arbitrary structured light patterns, in the
process highlighting when the technique is applicable and when not, and how
best to implement it. This work will be a useful addition to the structured
light toolkit, and particularly relevant to those wishing to use the spatial
modes of light as a basis in classical and quantum communication.

17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol