Optical frequency comb generation with a flat-top spectrum from a mode-locked Yb fiber laser

Gwang Hoon Jang; Tai Hyun Yoon

doi:10.1117/12.905394

15 February 2012 Optical frequency comb generation with a flat-top spectrum from a mode-locked Yb fiber laser

Gwang Hoon Jang, Tai Hyun Yoon

Proceedings Volume 8237, Fiber Lasers IX: Technology, Systems, and Applications; 82373T (2012) https://doi.org/10.1117/12.905394
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

We present an ultrabroadband supercontinuum (SC) frequency comb generation covering the optical spectrum more than 1.2 octave from 570 nm to 1350 nm with a near flat-top power spectrum by using a mode-locked Yb fiber laser at 1030 nm as a master oscillator (MO). The repetition rate of the MO that has a spectral-width of 28 nm is 152 MHz and is phase-locked to a reference frequency synthesizer. A power amplifier is used to boost up the output power up to 1.3 W and the positively chirped amplified pulses are compressed by using a transmission grating pair. We used a commercially-available 10-cm long photonic crystal fiber that has two zero-dispersion wavelengths at 800 nm and 1093 nm, respectively, to generate an ultrabroadband SC frequency comb. Optical spectrum depending on the frequency chirp and pulse-width of the amplified pulses are analyzed to find an optimum coupling power as well as an optimum chirp parameter. We found that a dimensionless chirp parameter of 8.6 and a pulse-width of 517 fs for a chirped Gaussian pulse resulted in the optimum spectrum width of 1.2 octave.

Citation Download Citation

Gwang Hoon Jang and Tai Hyun Yoon "Optical frequency comb generation with a flat-top spectrum from a mode-locked Yb fiber laser", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82373T (15 February 2012); https://doi.org/10.1117/12.905394

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