SOLID HYDROGEN AS NONLINEAR OPTICAL MEDIUM
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Date
1997
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Publisher
Ohio State University
Abstract
Optical processes with quantum interference are opening various new possibilities beyond the limit of conventional optical processes. Typical examples would be ``lasing without population inversion” and ``resonantly enhanced nonlinear optics without resonant absorption”. The key physics of the processes is to establish a strongly-coupled dressed-state (typically, dark-state) as the eigen-state for Raman-driven three-level system. So far, it has been assumed that such processes can be realized only for low-density atomic systems. However, we show here that the ideal situation can be realized even in high-density solid medium using solid hydrogen. It is shown through the experiments of stimulated Raman scattering (SRS) that the strongly-coupled eigen-states are spontaneously evolved through the SRS process and in terms of the parametric anti-Stokes generation process the phase-matching is self-induced without stringent restriction of the medium. The present finding demonstrates its amazing potentiality of solid hydrogen as nonlinear optical medium, which may open a way to a new class of nonlinear-optics free from the restriction of the medium in wide wavelength range from infrared to vaccumultraviolet.
Description
Author Institution: Department of Applied Physics and Chemistry, and Institute for Laser Science, University of Electro-Communication