By See Leang Chin
Femtosecond Laser Filamentation supplies a accomplished evaluate of the physics of propagation of excessive femtosecond laser pulses in optical media (principally air) and the functions and demanding situations of this new technique.
This e-book provides the fashionable knowing of the physics of femtosecond laser pulse propagation, together with strange new results comparable to the self-transformation of the heartbeat right into a white mild laser pulse, depth clamping, the physics of a number of filamentation and pageant, and the way filaments’ skill to soften glass results in wave advisor writing. the capability functions of laser filamentation in atmospheric sensing and the iteration of different electromagnetic pulses from the UV to the radio frequency are handled, including attainable destiny demanding situations within the excitation of super-excited states of molecules. intriguing new phenomena reminiscent of filament brought on ultrafast birefringence and the excitation of molecular rotational wave packets and their a number of revivals in air (gases) may also be discussed.
This quantity offers the main complete and updated dialogue of those themes at present to be had. it is going to be of serious curiosity to scientists and researchers utilizing extreme femtosecond laser pulses in addition to to graduate scholars and researchers who desire to study extra concerning the field.
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Extra resources for Femtosecond Laser Filamentation
The intensity in this zone soon after filamentation is estimated to be of the order of 1010 W/cm2 by using the measured data described above. Numerical simulation (Fig. 24) shows that at 200 < z < 300 cm, the leading sub-pulse (peak power ∼ = 3Pcr ) dominates (Fig. 24b, z = 252 cm). 4 Full Evolution of a Single Filament 43 Fig. 23 (a) Measured nitrogen fluorescence signal (open triangle) and energy evolution of the central hot spot at the fundamental wavelength (solid circle) as a function of the propagation distance.
Each panel in Fig. 14f–j corresponds to the experimental result in the same row. It is seen that the experimental results are well reproduced by the simulations. Also, for the percentage of initial energy transmitted through the pinhole (Fig. 15a), there is a good agreement between the experimental results (open triangles) and those from simulations (solid squares) for all pinhole diameters. The results for the on-axis electron density distribution from numerical simulation, shown in Fig. 15b, reveal differences in the long-scale propagation outside the view of the ICCD camera between the cases of the 1 mm pinhole and the 2 mm pinhole.
Through partial reflection, the beam pattern at the surface of the wedge was imaged onto a calibrated CCD camera with calibrated attenuation and filtering. The fluence distribution of the pattern can be obtained from the signal of each pixel from each image at each position. The beam diameter at FWHM can then be quantitatively defined. Meanwhile, the nitrogen fluorescence at different positions from inside the filament was measured from the side using appropriate UV filters and a PMT. 21 shows the detail of the experimental setup.