Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Towards optimization of pulsed sodium laser guide stars   Pulsed sodium laser guide stars (LGS) are useful because they allow for
Rayleigh blanking and fratricide avoidance in multiple-LGS systems.
Bloch-equation simulations of sodium-light interactions show that these may be
able to achieve photon returns nearly equal to, and in some cases greater than,
what is seen from continuous-wave (CW) excitation. In this work, we study the
time-dependent characteristics of sodium fluorescence, and investigate the
optimal format for the new fiber laser LGS that will be part of the upgraded
adaptive optics (AO) system on the Shane telescope at Mt. Hamilton. Results of
this analysis are examined in the context of their general applicability to
other LGS systems and the potential benefits of uplink correction are
considered. Comparisons of simulation predictions with measurements from
existing LGS are also presented and discussed.

17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph