Journal
IEEE PHOTONICS JOURNAL
Volume 13, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2021.3104934
Keywords
Microresonator; optical frequency comb (OFC); dissipative Kerr soliton; Spectroscopy
Funding
- National Key Research, and Development Program of China [2016YFA0301303]
- National Natural Science Foundation of China [11874342, 11934012, 92050109, 41904136]
- Key-Area Research, and Development Program of Guangdong Province [2020B0303020001]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- Fundamental Research Funds for the Central Universities
- State KeyLaboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, China
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The study overcame the limitation of large linespacing in soliton comb, improving spectroscopy detection resolution. By locking the pump laser to a reference cavity, a high frequency resolution was achieved. Scanning the microcomb allowed fast measurement of gas absorption spectra and high-Q optical modes.
Dissipative Kerr solitons (DKS)s offer an integrated platform for broad spectrum coverage, which is suitable for the high sensitivity spectroscopy. However, the large linespacing of the soliton comb limits the spectroscopy detection resolution. We overcome this limitation by modulating the soliton comb lines through an external EOMwith a tunable RF source. By locking the pump laser to a reference cavity, the linewidth of the pump laser was compressed from1.13 MHzto 72 kHz, leading to the silimar linewidth of comb lines and showing a frequency resolution of hundreds ofkHz. Based on the scannedmicrocomb, we measured the absorption spectra of a gas cell and the high-Q optical modes in themicrocavity, with a fast scanning speed of 16 GHz/mu s. The scanning comb allows the spectroscopy measurement to cover the whole comb mode spectrum over THz bandwidth. Our setup holds great potential for simple, robust spectroscopy measurement.
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