Journal
OPTICS EXPRESS
Volume 26, Issue 19, Pages 24551-24563Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.024551
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Funding
- Japan Science and Technology Agency (JST) through the ERATO MINOSHIMA Intelligent Optical Synthesizer (IOS) Project
- JSPS KAKENHI [15K05547]
- Grants-in-Aid for Scientific Research [15K05547] Funding Source: KAKEN
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We introduce a simple scheme for mode-density multiplication of an optical frequency comb (OFC) by a factor of square of an arbitrary integer N using phase modulation. This scheme is employed to multiply the mode density of an erbium-doped fiber laser OFC (repetition rate of 66.87 MHz) by factors of 4(2),8(2), and 3 . 4(2) using an electro-optic phase modulator. The OFC multiplied by 4(2) is applied to direct-comb spectroscopy of methane with a spectral resolution of 4.18 MHz. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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