Plasma channel formed by ultraviolet laser pulses at 193 nm in air

【摘要】 <正> The propagation of picosecond deep ultraviolet laser pulse at wavelength of 193 nm in air is numericallyinvestigated. Long plasma channel can be formed due to the competition between Kerr self-focusing andionization induced defocusing. The plasma channel with electron density of above 10¹³/cm³ can be formedover 70 m by 50-ps, 20-mJ laser pulses. The fluctuation of laser intensity and electron density insideultraviolet （UV） plasma channel is significantly lower than that of infrared pulse. The linear absorption ofUV laser by air is considered in the simulation and it is shown that the linear absorption is important forthe limit of the length of plasma channel.更多还原

【Abstract】 The propagation of picosecond deep ultraviolet laser pulse at wavelength of 193 nm in air is numerically investigated. Long plasma channel can be formed due to the competition between Kerr self-focusing and ionization induced defocusing. The plasma channel with electron density of above 10¹³/cm³ can be formed over 70 m by 50-ps, 20-mJ laser pulses. The fluctuation of laser intensity and electron density inside ultraviolet （UV） plasma channel is significantly lower than that of infrared pulse. The linear absorption of UV laser by air is considered in the simulation and it is shown that the linear absorption is important for the limit of the length of plasma channel.更多还原