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Conference on Lasers and Electro-Optics

The theory of temporal compression of intense pulses in a metal vapor

M. J. Shaw, John K. Crane

Published Nov 1, 1990• 0 citations
OpenAlex

Abstract

We examine compression of near-resonant pulses in metal vapor in the nonlinear regime. Our calculations examine nonlinear effects on compression of optimally-chirped pulses of various fluences. In addition, we compare model predictions with experimental results for compression of 4 nsec Nd:YAG pumped dye pulses.

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The theory of temporal compression of intense laser pulses in a metal vapor

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arXiv:1902.09281•Physical Review A•Jun 24, 2019•12 citations
Numerical simulations of the compression of laser pulses by propagation through a medium of two-level near resonant atoms is presented. The compression of long pulses (>10 ns) whose peak Rabi frequency is comparable to the laser detuning from the atomic transition is addressed. This regime is one in which an accurate description of the physics requires solution of the Maxwell-Bloch equations. A model to investigate nonlinear effects on the compression process has been developed. The analysis begins with a study of the compression of optimally chirped pulses of various fluences. The onset of the nonlinear effects and their ramifications on the compression process are addressed.>
We wish to use atomic group-velocity dispersion to compress energetic copper-vapor laser- pumped dye-laser pulses from 40 ns to approximately 300 ps. This talk focuses on numerical results that illustrate coherent atomic effects on the process. Traditionally, analysis has been based on linear dispersion theory (LDT). This model represents the atoms as a static susceptibility. This susceptibility gives rise to the differential group delay required for compression of frequency-swept pulses. However, LDT is inadequate in analyzing compression in a regime in which the coherent transition rate (Rabi frequency) is comparable to the laser detuning. Here population transfer becomes significant, thus invalidating the concept of a steady-state dipole. An adequate representation of the atomic system requires solution of the coupled Maxwell-Bloch equations. We have developed a code to model near-resonant coherent propagation through inhomogeneously broadened two-level atoms.
We present a study of the temporal compression of nanosecond laser pulses resulting from the coherent control peculiarities of the propagation dynamics in a regime of electromagnetically induced transparency. We describe the general theoretical framework and discuss the crucial conditions required in order to experimentally realize such a temporal compression scheme. A proof-of-concept experimental realization of a scheme of this type in a sample of hot sodium vapors is currently being implemented: we describe in detail the experimental setup designed for this purpose.
We investigate the propagation of ultrashort laser pulses in atomic rubidium vapor. The pulses are intensive enough to ionize the atoms and are directly resonant with the 780-nm D2{D}_{2}D2​ line. We derive a relatively simple theory for computing the nonlinear optical response of atoms and investigate the competing effects of strong resonant nonlinearity and ionization in the medium using computer simulations. A nonlinear self-channeling of pulse energy is found to produce a continuous plasma channel with complete ionization. We evaluate the length, width, and homogeneity of the resulting plasma channel for various values of pulse energy and initial focusing to identify regimes optimal for applications in plasma-wave accelerator devices such as that being built by the AWAKE collaboration at CERN. Similarities and differences with laser pulse filamentation in atmospheric gases are discussed.