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| Abstract |
The necessary laser power in laser fluorescence spectroscopy for light impurity detection at the periphery of high temperature plasmas is evaluated for cases of direct excitation and multi-photon exci...tation. The results show that the direct excitation is more promising for an atomic density of less than 10^<17>m^<－3>, in which case a laser power of several tens of watt is sufficient to obtain SNR of more than 10 against shot noise. Based on the evaluation, two-photon-resonallt four-wave-mixing in magnesium vapor has been adopted for the generation of tunable vuv light. In order to confirm a stable operation of a heat pipe oven, which is used for the generation of the magnesium vapor with a pressure of around 20 Torr, preliminary experiments have been carried out on the mode of two－photon pesonant third－harmonic－generation． The rusults were promising， confirming a stable operation of the heat pipe oven and a generation of vuv light．show more
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