Interaction of intense ultra-short optical pulses with matter- applications to ultrafast material modification and generation of high harmonics
Abstract
We will model the transient electronic, optical and structural properties of the photo excited crystalline and noncrystalline materials, irradiated by intense femtosecond laser pulses by using the time dependent Schrodinger equation (TDSE) in one electron approximation. The pulse propagation in the non-linear photo excited medium will be modeled by combining system of vector nonlinear envelope equations (VNEE) with equation describing generation of electron plasma. For solving the linear Schrodinger equation in the case of high harmonic generation we shall employ ab initio methods, while for the solution of the VNEE the split-step Fourier method will be used. The collisional effects which generally cause decrease in the high harmonic yield shall be modeled by using a combined quantum kinetic and ab initio models. The many-body quantum effects which take place in multi electron systems will also be investigated using quantum Monte Carlo methods with time dependence which offer an instrumental approach to account for the quantum coherences and quantum entanglement in many-body systems. The inclusion of more atoms in atomic arrays will allow us to predict phase transitions in solid-state materials and their time dependence under influence of femto- and attosecond optical pulses. As a result of the calculations the ultrafast material response depending on the optical pulse parameters will be obtained including laser-induced transient nonlinear optical properties, laser generated transient plasma density, transient energy density deposited within the electronic system, generation of high harmonics and effects of filamentation. Special attention will be paid to post-filamentation (ionization-free) regime, asymmetric spectral broadening and coherent THz generation in filamentation process.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2023
- Source ID
- FA86552217175
Entities
People
- Tzveta Apostolova
Organizations
- Air Force Office of Scientific Research
- New Bulgarian University
- United States Air Force