Abstract：
: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 × 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 4.25 THz 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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Jang H,Kim BS,Chun BJ,Kang HJ,Jang YS,Kim YW,Kim YJ,Kim SWdoi
10.1038/s41598-019-44122-5subject
Has Abstractpub_date
2019-05-21 00:00:00pages
7652issue
1issn
2045-2322pii
10.1038/s41598-019-44122-5journal_volume
9pub_type
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