Using 300-fs 1039-nm Yb-doped fiber laser, we experimentally demonstrate blue light generation in a high- Δ and high nonlinear photonic crystal fiber （PCF）. The zero dispersion wavelength of PCF is 793 nm, detuning...Using 300-fs 1039-nm Yb-doped fiber laser, we experimentally demonstrate blue light generation in a high- Δ and high nonlinear photonic crystal fiber （PCF）. The zero dispersion wavelength of PCF is 793 nm, detuning 245.8 nm from the pump wavelength. PCF allows a frequency conversion exceeding the octave of pump wavelength. The visible component of the measured output spectrum occurs in the fundamental mode and spans from 391.3 to 492.3 nm. The peak wavelength of 441.8 nm has a frequency detuning of 390 THz from the pump wavelength of 1039 nm.展开更多
The ablation in zinc selenide （ZnSe） crystal is studied by using 150-fs, 800-nm laser system. The images of the ablation pit measured by scanning electronic microscope （SEM） show no thermal stress and melting dyna...The ablation in zinc selenide （ZnSe） crystal is studied by using 150-fs, 800-nm laser system. The images of the ablation pit measured by scanning electronic microscope （SEM） show no thermal stress and melting dynamics. The threshold fluence is measured to be 0.7 J/cm^2. The ultrafast ablation dynamics is studied by using pump and probe method. The result suggests that optical breakdown and ultrafast melting take place in ZnSe irradiated under femtosecond laser pulses.展开更多
文摘Using 300-fs 1039-nm Yb-doped fiber laser, we experimentally demonstrate blue light generation in a high- Δ and high nonlinear photonic crystal fiber （PCF）. The zero dispersion wavelength of PCF is 793 nm, detuning 245.8 nm from the pump wavelength. PCF allows a frequency conversion exceeding the octave of pump wavelength. The visible component of the measured output spectrum occurs in the fundamental mode and spans from 391.3 to 492.3 nm. The peak wavelength of 441.8 nm has a frequency detuning of 390 THz from the pump wavelength of 1039 nm.
基金This work was supported by the National Natural Sci-ence Foundation of China under Grant No. 60108002.
文摘The ablation in zinc selenide （ZnSe） crystal is studied by using 150-fs, 800-nm laser system. The images of the ablation pit measured by scanning electronic microscope （SEM） show no thermal stress and melting dynamics. The threshold fluence is measured to be 0.7 J/cm^2. The ultrafast ablation dynamics is studied by using pump and probe method. The result suggests that optical breakdown and ultrafast melting take place in ZnSe irradiated under femtosecond laser pulses.
