Non-Monochromatic Ionization Effects Induced by Ultrashort Laser Pulses in Dielectric Crystals
Abstract
The objective of this effort is to derive analytic relations for the rates of laser-driven ionization, linear and nonlinear absorption to simulate ultrafast optical response of a dielectric crystal to action of an ultrashort high-intensity laser pulse. Laser-induced ionization is the fundamental process directly associated with absorption of laser-pulse energy via linear (by laser-generated electron-hole plasma) and nonlinear (multiphoton absorption attributed to electron excitation from valence to conduction band) mechanisms. The ionization is one of the key effects affecting ultrafast nonlinear propagation in dielectric solids. The most popular approaches to simulate the ionization either numerically solve some quantum-mechanical equations or solve a rate equation for free-electron density with rates given by monochromatic-approximation analytical relations. Delivering scaling with laser and material parameters (e. g., wavelength, carrier-envelope phase, pulse width, band gap, and effective electron mass) is a challenge for the numerical approaches. The rate-equation models cannot properly treat the ultrashort pulses because significant bandwidth of the pulses does not fit the monochromatic approximation of the models.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 07, 2018
- Accession Number
- AD1063905
Entities
People
- Vitaly Gruzdev
Organizations
- University of Missouri