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Observation of ultrafast electron behavior in femtosecond optical breakdown of dielectrics
By: Ming Li; Gibson, G.N.; Chunlei Guo; Nibarger, J.P.; Menon, S.;
1999 / IEEE / 1-55752-595-1
Description
This item was taken from the IEEE Conference ' Observation of ultrafast electron behavior in femtosecond optical breakdown of dielectrics ' Summary form only given. Many studies have been conducted on the ultrafast breakdown of dielectrics in order to understand the different processes involved. Such investigations are important to diverse fields such as micromachining, medical physics and solid state physics. Generally, laser induced breakdown in dielectrics is described in terms of three major processes: (i) multiphoton ionization (MPI) and/or tunneling causing the excitation of electrons to the conduction band, (ii) electron-electron collisional ionization (avalanche process) due to Joule heating, (iii) plasma energy transfer to the lattice. While the first two processes deposit energy in the plasma, the third process releases the deposited energy to the lattice thereby inducing the actual damage. This transfer of energy to the lattice is expected to occur after the laser pulse. Until recently, the above processes have been studied by measuring the pulse duration dependence of OBT. Although single pulse OBT measurements have been extended to the 5 fs-range, it is very difficult to extract information regarding electron dynamics from such measurements, especially the time scale for the plasma energy decay. We have developed a new pump-probe double pulse experiment, which is more sensitive to dynamic behavior.
Related Topics
Photoionisation
Tunnelling
Avalanche Breakdown
5 Fs
Ultrafast Electron Behavior
Femtosecond Optical Breakdown
Dielectrics
Ultrafast Breakdown
Micromachining
Medical Physics
Solid State Physics
Laser Induced Breakdown
Multiphoton Ionization
Tunneling
Conduction Band
Electron-electron Collisional Ionization
Avalanche Process
Joule Heating
Plasma Energy Transfer
Deposited Energy
Energy Deposition
Energy Transfer
Laser Pulse
Pulse Duration Dependence
Electron Dynamics
Time Scale
Plasma Energy Decay
Pump-probe Double Pulse Experiment
Dynamic Behavior
Ultrafast Optics
Electron Optics
Plasma Measurements
Pulse Measurements
Lattices
Dielectric Breakdown
Physics
Ionization
Energy Measurement
Time Measurement
Multiphoton Processes
Dielectric Materials
Laser Beam Effects
High-speed Optical Techniques
Electric Breakdown
Engineering
Electron Excitation