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Harmonic Mode-Locked Ytterbium-Doped Fibre Ring Laser |
YANG Ling-Zhen 1;WANG Yun-Cai 1;CHEN Guo-Fu 2;WANG Yi-Shan 2;ZHAO
Wei 2 |
| 1Department of Physics, College of Science, Taiyuan University of Technology, Shanxi 0300242State Key Laboratory of Transient Optics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710068 |
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| Cite this article: |
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YANG Ling-Zhen, WANG Yun-Cai, CHEN Guo-Fu et al 2007 Chin. Phys. Lett. 24 944-946 |
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Abstract We demonstrate a harmonic mode-locked ytterbium-doped fibre ring laser,
which consists of a polarization-sensitive isolator, two polarization controllers, two 976nm laser diodes as the pump source and a two-segment ytterbium-doped fibre. Utilizing an additive pulse mode-locked technique based on nonlinear polarization evolution, the ytterbium-doped fibre laser can operate in mode-locked state by adjusting the position of polarization controllers. The cavity fundamental repetition rate is 23.78MHz. We also observe the second-
and third-harmonic mode locking in the normal dispersion region, and their repetition rates are 47.66MHz and 71.56MHz, respectively. Over-driving of the saturable absorber in the harmonic mode-locking pulse is analysed and discussed in detail.
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| Keywords:
42.55.Wd
42.65.Re
42.60.Da
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Received: 19 October 2006
Published: 26 March 2007
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| PACS: |
42.55.Wd
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(Fiber lasers)
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42.65.Re
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(Ultrafast processes; optical pulse generation and pulse compression)
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42.60.Da
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(Resonators, cavities, amplifiers, arrays, and rings)
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