Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gigahertz Self-referenceable Frequency Comb from a Semiconductor Disk
  Laser   We present a 1.75-GHz self-referenceable frequency comb from a vertical
external-cavity surface-emitting laser (VECSEL) passively modelocked with a
semiconductor saturable absorber mirror (SESAM). The VECSEL delivers 231-fs
pulses with an average power of 100 mW and is optimized for stable and reliable
operation. The optical spectrum was centered around 1038 nm and nearly
transform-limited with a full width half maximum (FWHM) bandwidth of 5.5 nm.
The pulses were first amplified to an average power of 5.5 W using a
backward-pumped Yb-doped double-clad large mode area (LMA) fiber and then
compressed to 85 fs with 2.2 W of average power with a passive LMA fiber and
transmission gratings. Subsequently, we launched the pulses into a highly
nonlinear photonic crystal fiber (PCF) and generated a coherent octave-spanning
supercontinuum (SC). We then detected the carrier-envelope offset (CEO)
frequency (fCEO) beat note using a standard f-to-2f-interferometer. The fCEO
exhibits a signal-to-noise ratio of 17 dB in a 100-kHz resolution bandwidth and
a FWHM of 10 MHz. To our knowledge, this is the first report on the detection
of the fCEO from a semiconductor laser, opening the door to fully stabilized
compact frequency combs based on modelocked semiconductor disk lasers.

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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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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: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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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: ao-sci