Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calibration of wavefront distortion in light modulator setup by Fourier
  analysis of multi-beam interference   We present a method to calibrate wavefront distortion of the spatial light
modulator setup by registering far field images of several Gaussian beams
diffracted off the modulator. The Fourier transform of resulting interference
images reveals phase differences between typically 5 movable points on the
modulator. Repeating this measurement yields wavefront surface. Next, the
amplitude efficiency is calibrated be registering near field image. As a
verification we produced a superposition of 7th and 8th Bessel beams with
different phase velocities and observed their interference.

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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph