Supercontinuum generation in quadratic nonlinear waveguides without quasi-phase matching

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題名:	Supercontinuum generation in quadratic nonlinear waveguides without quasi-phase matching
作者:	陳彥宏;Guo, Hairun;Zhou, Binbin;Steinert, Michael;Setzpfandt, Frank;Pertsch, Thomas;Chung, Hung-ping;Chen, Yen-Hung;Bache, Morten
貢獻者:	理學院光電科學與工程學系
關鍵詞:	Crystals;Lithium niobates;Matching;Nonlinearity;Solitons;Ultrafast lasers;Waveguides;Wavelengths
日期:	2015-01-01
上傳時間:	2026-04-23 11:47:12 (UTC+8)
出版者:	United States
摘要:	摘要： Supercontinuum generation (SCG) is most efficient when the solitons can be excited directly at the pump laser wavelength. Quadratic nonlinear waveguides may induce an effective negative Kerr nonlinearity, so temporal solitons can be directly generated in the normal (positive) dispersion regime overlapping with common ultrafast laser wavelengths. There is no need for waveguide dispersion engineering. Here, we experimentally demonstrate SCG in standard lithium niobate (LN) waveguides without quasi-phase matching (QPM), pumped with femtosecond pulses in the normal dispersion regime. The observed large bandwidths (even octave spanning), together with other experimental data, indicate that negative nonlinearity solitons are indeed excited, which is backed up by numerical simulations. The QPM-free design reduces production complexity, extends the maximum waveguide length, and limits undesired spectral resonances. Finally, nonlinear crystals can be used where QPM is inefficient or impossible, which is important for mid-IR SCG. QPM-free waveguides in mid-IR nonlinear crystals can support negative nonlinearity solitons, as these waveguides have a normal dispersion at the emission wavelengths of mid-IR ultrafast lasers. 其他題名： Opt Lett 出版者： United States 出版日期： 2015-02-15 出處： Optics letters, 2015-02, Vol.40 (4), p.629-632 資源來源： Optica Publishing Group Journals 識別號： ISSN: 0146-9592 識別號： ISSN: 1539-4794 識別號： EISSN: 1539-4794 識別號： DOI: 10.1364/OL.40.000629 識別號： PMID: 25680167
顯示於類別:	[光電科學與工程學系] 期刊論文

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