Controlled stimulated Raman amplification and oscillation in hydrogen gas

Abstract

The gain of the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q(1)</tex> vibrational stokes line of H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> has been measured as a function of pressure in a Raman amplifier cell of variable length. The threshold power for stimulated emission of the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q(1)</tex> vibrational and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S(1)</tex> rotational stokes line of H <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> has been measured in a transverse resonator as a function of pressure. Both geometries give results in good agreement with theory, without invoking any other nonlinear instabilities.