Nonlinear optical processes in Rydberg atoms systems

Abstract

The interaction between Rydberg systems {Rydberg atoms (RA) gas or Rydberg matter (RM)} and coherent light in various frequency bands is considered. It is shown why Rydberg systems possess a greater polarizabilities and, accordingly, linear and nonlinear susceptibilities and strong sensitive to high-1 (circular) Rydberg states in RA and RM. Quantum theory of physical and chemical properties of RA and RM are related with recent obtained results on the optical spectroscopy. The experimental data of Raman processes, wave mixing effects in gas of RA, and their clusters of RM are analyzed. Problem of blueshifts and stimulated electronic laser Raman processes, as well as four wave mixing in RM are discussed. Rydberg atom (RA) itself, and different RA systems are now a topic of considerable interest. Recent development in laser physics and laser technology has aroused new interest to study fundamental concepts of quantum physics and quantum optics. Many problems have become available for experimental test. As for instance, quantum-classical boundary [I], * edmany@isssph.kiae.ru: Fax: 7(095)196 59 73; Phone: 7 (095) 196 91 07

Quantum interference control of carriers and currents in zinc blende semiconductors based on nonlinear absorption processes

“…Quantum interference between different optical processes arises when two optical beams of different frequencies can lead to the same transition. It has been used to study photoionization of molecular systems [1][2][3][4][5][6], and asymmetric photoejection in semiconductors [7][8][9][10][11]. In a crystal, amplitudes for different optical processes leading to electron-hole excitations can interfere constructively in some regions of the Brillouin zone (BZ), and destructively in others.…”

Quantum Interference Control of Photocurrents in Semiconductors by Nonlinear Optical Absorption Processes

“…Quantum interference control (QuIC) based on optical processes of different photon numbers has been used for exciting and controlling target states in both molecular and crystalline systems. It has been used for molecular excitation and ionization [1][2][3][4][5][6], and in semiconductors it was first used for asymmetric photoejection [7][8][9][10][11] and later for current injection [12,13]. Quantum interference of optical absorption processes can be constructive in some regions of the Brillouin zone (BZ) while destructive in others, which results into a net overall current control.…”