Comb-rooted multi-channel synthesis of ultra-narrow optical frequencies of few Hz linewidth

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We report a multi-channel optical frequency synthesizer developed to generate extremely stable continuous-wave lasers directly out of the optical comb of an Er-doped fiber oscillator. Being stabilized to a high-finesse cavity with a fractional frequency stability of 3.8 x 10(-15) at 0.1 s, the comb-rooted synthesizer produces multiple optical frequencies of ultra-narrow linewidth of 1.0 Hz at 1 s concurrently with an output power of tens of mW per each channel. Diode-based stimulated emission by injection locking is a key mechanism that allows comb frequency modes to sprout up with sufficient power amplification but no loss of original comb frequency stability. Channel frequencies are individually selectable with a 0.1 GHz increment over the entire comb bandwidth spanning 4.25THz around a 1550 nm center wavelength. A series of out-of-loop test results is discussed to demonstrate that the synthesizer is able to provide stable optical frequencies with the potential for advancing diverse ultra-precision applications such as optical clocks comparison, atomic line spectroscopy, photonic microwaves generation, and coherent optical telecommunications.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2019-05
Language
English
Article Type
Article
Citation

SCIENTIFIC REPORTS, v.9, no.1

ISSN
2045-2322
DOI
10.1038/s41598-019-44122-5
URI
http://hdl.handle.net/10203/262608
Appears in Collection
ME-Journal Papers(저널논문)
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