The rod-pinch diode(RPD)is a kind of new X-ray source for flash radiographic apphcations,especially in the small-scale hydrodynamic experiments.According to theoretical analysis and the generator parameters,the 1MV ro...The rod-pinch diode(RPD)is a kind of new X-ray source for flash radiographic apphcations,especially in the small-scale hydrodynamic experiments.According to theoretical analysis and the generator parameters,the 1MV rod pinch diode has been designed and studied experimentally.As a result,1.21 to 1.45rads at 1m in the forward direction (0°)are achieved in 18.1 to 27.5ns FWHM pulses,the spot sizes are 0.8 to 1.1mm with 1-mm-diameter tungsten rods. This suggests that the rod-pinch diode is a perfect X-ray source used in the small-scale hydrodynamic experiments.展开更多
In this work, a two-photon polymerization(2PP) processing device was built using the femtosecond laser, and femtosecond laser direct writing was performed on SU-8 photoresist. Due to the 2PP effect of the photoresist ...In this work, a two-photon polymerization(2PP) processing device was built using the femtosecond laser, and femtosecond laser direct writing was performed on SU-8 photoresist. Due to the 2PP effect of the photoresist caused by the femtosecond laser, the polymeric line with size less than the focal spot size is obtained. Based on the Raman spectroscopy characterization of SU-8 polymer before and after 2PP, we research the dynamic process of femtosecond laser induced 2PP. In Raman spectra, some scattering peaks with large intensity variation, such as 1 108 cm^(-1) and 1 183 cm^(-1), indicate that the asymmetric stretching vibration of C-O-C bond in SU-8 polymer is increased. By comparison, we can find that 2PP only affects the light absorption of initiator, but does not affect the monomer polymerization. It is helpful to understand the interaction of photoresist and femtosecond laser, and plays an important role in quantitatively controlling the polymerization degree of SU-8 polymer and improving the processing resolution of 2PP.展开更多
文摘The rod-pinch diode(RPD)is a kind of new X-ray source for flash radiographic apphcations,especially in the small-scale hydrodynamic experiments.According to theoretical analysis and the generator parameters,the 1MV rod pinch diode has been designed and studied experimentally.As a result,1.21 to 1.45rads at 1m in the forward direction (0°)are achieved in 18.1 to 27.5ns FWHM pulses,the spot sizes are 0.8 to 1.1mm with 1-mm-diameter tungsten rods. This suggests that the rod-pinch diode is a perfect X-ray source used in the small-scale hydrodynamic experiments.
基金supported by the National Basic Research Program of China(No.2010CB934101)the National Natural Science Foundation of China(No.11404173)
文摘In this work, a two-photon polymerization(2PP) processing device was built using the femtosecond laser, and femtosecond laser direct writing was performed on SU-8 photoresist. Due to the 2PP effect of the photoresist caused by the femtosecond laser, the polymeric line with size less than the focal spot size is obtained. Based on the Raman spectroscopy characterization of SU-8 polymer before and after 2PP, we research the dynamic process of femtosecond laser induced 2PP. In Raman spectra, some scattering peaks with large intensity variation, such as 1 108 cm^(-1) and 1 183 cm^(-1), indicate that the asymmetric stretching vibration of C-O-C bond in SU-8 polymer is increased. By comparison, we can find that 2PP only affects the light absorption of initiator, but does not affect the monomer polymerization. It is helpful to understand the interaction of photoresist and femtosecond laser, and plays an important role in quantitatively controlling the polymerization degree of SU-8 polymer and improving the processing resolution of 2PP.
