Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simultanous two-wavelength phase unwrapping using external module for
  multiplexing off-axis holography   We present a dual-wavelength external holographic microscopy module for
quantitative phase imaging of 3D structures with extended thickness range. This
is done by simultaneous acquisition of two off-axis interferograms, each of
which at a different wavelength, and generation of a synthetic wavelength,
which is larger than the sample optical thickness, allowing two-wavelength
unwrapping. The simultaneous acquisition is carried out by using optical
multiplexing of the two interferograms onto the camera, where each of them has
orthogonal off-axis interference fringe direction in relation to the other one.
We used the system to quantitatively image a 7.96 um step target and 30.5 um
circular copper pillars.

1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci