Blue-shifted dispersive waves(DWs)are efficiently generated from the red-shifted solitons by coupling the 120 fs pulses into the fundamental mode of the multi-knots of a photonic crystal fiber cladding.When the femtos...Blue-shifted dispersive waves(DWs)are efficiently generated from the red-shifted solitons by coupling the 120 fs pulses into the fundamental mode of the multi-knots of a photonic crystal fiber cladding.When the femtosecond pulses at the wavelength of 825 nm and the average power of 300 mW are coupled into knots 1–3,the conversion efficiencyηDW of 32%and bandwidth BDW of 50 nm are obtained.The ultrashort pulses generated by the DWs can be tunable over the whole visible wavelength by adjusting the wavelengths of the pump pulses coupled into different knots.It can be believed that this widely wavelength-tunable ultrashort visible pulse source has important applications in ultrafast photonics and resonant Raman scattering.展开更多
Planar optical waveguides in single crystals of KNbOs were fabricated by MeV B and He ion implantation.The depth profiles of radiation damage in these waveguides were compared and analyzed by high resolution transmiss...Planar optical waveguides in single crystals of KNbOs were fabricated by MeV B and He ion implantation.The depth profiles of radiation damage in these waveguides were compared and analyzed by high resolution transmission electron microscope.Non leaky waveguiding modes(TEo and TMo),which are due to implantation induced increase of rib and nc,were observed in 6.0 MeV B ion implantated waveguides with a dose of 1×10^(15)cm^(-2).展开更多
基金Supported by the National Basic Research Program of China(2010CB327605,2010CB328300)the Key Grant of Ministry of Education(109015)+3 种基金the Program for New Century Excellent Talents in University(NECT-11-0596)Beijing Nova Program(2011066)the Fundamental Research Funds for the Central Universities(2011RC008,2011RC0404)Open Fund of State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications).
文摘Blue-shifted dispersive waves(DWs)are efficiently generated from the red-shifted solitons by coupling the 120 fs pulses into the fundamental mode of the multi-knots of a photonic crystal fiber cladding.When the femtosecond pulses at the wavelength of 825 nm and the average power of 300 mW are coupled into knots 1–3,the conversion efficiencyηDW of 32%and bandwidth BDW of 50 nm are obtained.The ultrashort pulses generated by the DWs can be tunable over the whole visible wavelength by adjusting the wavelengths of the pump pulses coupled into different knots.It can be believed that this widely wavelength-tunable ultrashort visible pulse source has important applications in ultrafast photonics and resonant Raman scattering.
基金Supported by the China National Nuclear Corporation,No.H7196FY003,。
文摘Planar optical waveguides in single crystals of KNbOs were fabricated by MeV B and He ion implantation.The depth profiles of radiation damage in these waveguides were compared and analyzed by high resolution transmission electron microscope.Non leaky waveguiding modes(TEo and TMo),which are due to implantation induced increase of rib and nc,were observed in 6.0 MeV B ion implantated waveguides with a dose of 1×10^(15)cm^(-2).
