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Appl. Sci. 2014, 4(4), 515-524; doi:10.3390/app4040515

Broadband Continuous-Wave Multi-Harmonic Optical Comb Based on a Frequency Division-by-Three Optical Parametric Oscillator

1
Institute of Photonics Technologies, National Tsing Hua University, Hsinchu 30013, Taiwan
2
Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
3
Brain Research Center, National Tsing Hua University, Hsinchu 30013, Taiwan
4
Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Rd., Sec. 4, Taipei 10617, Taiwan
5
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 12 May 2014 / Revised: 6 November 2014 / Accepted: 10 November 2014 / Published: 26 November 2014
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Abstract

We report a multi-watt broadband continuous-wave multi-harmonic optical comb based on a frequency division-by-three singly-resonant optical parametric oscillator. This cw optical comb is frequency-stabilized with the help of a beat signal derived from the signal and frequency-doubled idler waves. The measured frequency fluctuation in one standard deviation is ~437 kHz. This is comparable to the linewidth of the pump laser which is a master-oscillator seeded Yb:doped fiber amplifier at ~1064 nm. The measured powers of the fundamental wave and the harmonic waves up to the 6th harmonic wave are 1.64 W, 0.77 W, 3.9 W, 0.78 W, 0.17 W, and 0.11 W, respectively. The total spectral width covered by this multi-harmonic comb is ~470 THz. When properly phased, this multi-harmonic optical comb can be expected to produce by Fourier synthesis a light source consisting of periodic optical field waveforms that have an envelope full-width at half-maximum of 1.59 fs in each period. View Full-Text
Keywords: parametric oscillator; quasi-phase-matching; arbitrary waveform; ultrashort optical pulses; frequency division parametric oscillator; quasi-phase-matching; arbitrary waveform; ultrashort optical pulses; frequency division
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, Y.-Y.; Wu, P.-S.; Yang, H.-R.; Shy, J.-T.; Kung, A.H. Broadband Continuous-Wave Multi-Harmonic Optical Comb Based on a Frequency Division-by-Three Optical Parametric Oscillator. Appl. Sci. 2014, 4, 515-524.

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