Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable dual-comb from an all-polarization-maintaining single-cavity
  dual-color Yb:fiber laser   We demonstrate dual-comb generation from an all-polarization-maintaining
dual-color ytterbium (Yb) fiber laser. Two pulse trains with center wavelengths
at 1030 nm and 1060 nm respectively are generated within the same laser cavity
with a repetition rate around 77 MHz. Dual-color operation is induced using a
tunable mechanical spectral filter, which cuts the gain spectrum into two
spectral regions that can be independently mode-locked. Spectral overlap of the
two pulse trains is achieved outside the laser cavity by amplifying the 1030-nm
pulses and broadening them in a nonlinear fiber. Spatially overlapping the two
arms on a simple photodiode then generates a down-converted radio frequency
comb. The difference in repetition rates between the two pulse trains and hence
the line spacing of the down-converted comb can easily be tuned in this setup.
This feature allows for a flexible adjustment of the tradeoff between
non-aliasing bandwidth vs. measurement time in spectroscopy applications.
Furthermore, we show that by fine-tuning the center-wavelengths of the two
pulse trains, we are able to shift the down-converted frequency comb along the
radio-frequency axis. The usability of this dual-comb setup is demonstrated by
measuring the transmission of two different etalons while the laser is
completely free-running.

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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat