Abstract
In most substances which exhibit the stimulated Raman effect under high intensity laser excitation, the presence of self-focusing makes quantitative measurements almost impossible. We show that in the hydrogen gas, which has a very high self-focusing threshold, the stimulated Raman effect in an amplifier behaves according to the simple parametric theory. We use the frequency sharpening in the stimulated emission to make a quantitative study of the line shift of the Q[1] vibrational line of H 2 as a function of pressure, temperature, and foreign gas admixture. We then use some of these results to measure the line width of the Q[1] line in a Raman amplifier. We present results of these experiments and discuss other cases in which the stimulated Raman effect can be used to yield information about the scatterer.
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