Abstract
Since the first demonstration in 1978, multiwave Raman mixing in H2 has become a standard laboratory technique to generate tunable UV1 and VUV2 radiation. In spite of its widespread use, there has yet to be a detailed theory that can predict the large conversion efficiencies to the high-order anti-Stokes (AS) waves that have been observed experimentally at high intensities. In this paper, we review the current understanding of the basic physics of multiwave Raman mixing. The most recent calculations of the AS conversion efficiencies3 are compared to experiments that use pump lasers with near diffraction-limited beam quality and a transform-limited linewidth. The dependence of the conversion efficiencies on the linewidth, intensity, and pulse length of the pump laser, and the temperature, density, and ortho-para ratio of the H2 Raman medium are presented.
© 1988 Optical Society of America
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