Guiding femtosecond high-intensity high-contrast laser pulses by copper capillaries
V.E. Leshchenko, K.V. Gubin, V.I. Trunov, K.V. Lotov, E.V. Pestryakov
(Submitted on 2 Apr 2015)
Propagation of high-intensity, high-contrast (<10−8), 50,fs laser pulses through triangilar copper capillaries is experimentally studied. The relative transmission through 20-mm-long, about 50,μm wide capillaries is directly measured to be 70\% for input intensities up to 1017W/cm2. The copper reflectivity in vacuum, helium, and air is measured in the intensity range of 1010--1017W/cm2. No reflectivity decrease in vacuum and helium is observed, which leads to the conclusion that copper capillary waveguides can efficiently guide laser pulses of intensities up to 1019W/cm2 on the capillary axis (that corresponds to 1017W/cm2 on the walls). The reduction of the transmission efficiency to zero after a number of transmitted pulses is observed, which is caused by plug formation inside the capillary. The dependence of the capillary lifetime on the pulse energy is measured
đang được dịch, vui lòng đợi..
