| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Spectral broadening induced by intense ultra-short pulse in 4H-SiC crystals |
| Chun-hua Xu(徐春华)1, Teng-fei Yan(闫腾飞)2, Gang Wang(王刚)1, Wen-jun Wang(王文军)1, Jing-kui Liang(梁敬魁)1, Xiao-long Chen(陈小龙)1,3 |
1 Research and Development Center for Functional Crystals, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
3 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China |
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Abstract We report the observation of spectral broadening induced by 200 femtosecond laser pulses with the repetition rate of 1 kHz at the wavelength of 532 nm in semi-insulating 4H-SiC single crystals. It is demonstrated that the full width at half maximum of output spectrum increases linearly with the light propagation length and the peak power density, reaching a maximum 870 cm-1 on a crystal of 19 mm long under an incident laser with a peak power density of 60.1 GW/cm2. Such spectral broadening can be well explained by the self-phase modulation model which correlates time-dependent phase change of pulses to intensity-dependent refractive index. The nonlinear refractive index n2 is estimated to be 1.88×10-15 cm2/W. The intensity-dependent refractive index is probably due to both the nonlinear optical polarizability of the bound electrons and the increase of free electrons induced by the two-photon absorption process. Super continuum spectra could arise as crystals are long enough to induce the self-focusing effect. The results show that SiC crystals may find applications in spectral broadening of high power lasers.
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Received: 01 March 2016
Revised: 23 March 2016
Accepted manuscript online:
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PACS:
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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42.70.Mp
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(Nonlinear optical crystals)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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| Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2014AA041402) and the National Natural Science Foundation of China (Grant Nos. 51272276 and 51322211). |
Corresponding Authors:
Xiao-long Chen
E-mail: chenx29@iphy.ac.cn
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Cite this article:
Chun-hua Xu(徐春华), Teng-fei Yan(闫腾飞), Gang Wang(王刚), Wen-jun Wang(王文军), Jing-kui Liang(梁敬魁), Xiao-long Chen(陈小龙) Spectral broadening induced by intense ultra-short pulse in 4H-SiC crystals 2016 Chin. Phys. B 25 064206
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