Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-wave-mixing-induced nonlinear effects in an electromagnetically
  induced grating   We propose a multi-field-coupled atomic model that exhibits controllable
$symmetric$ and $asymmetric$ evolution of significantly enhanced diffraction
peaks in an opto-atomic grating at far-field regime. Such results are obtained
by the linear and nonlinear modulation of the intensities of the diffraction
peaks as a result of multi-wave-mixing-induced modification of spatially
modulated coherence in a closed four-level atomic system. Novelty of the
results lies in predicting super symmetric alignment of the diffraction peaks
due to the dominance of the amplitude part of the grating-transfer-function at
the condition of exact atom-field resonance, which is unique to the present
model. Efficacy of the present scheme is to apply it in producing nonlinear
light generated by four-wave-mixing-induced control of spatially modulated
coherence effect. The work also finds its importance for its applicability in
the field of high-precision atomic lithography.

6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom