The threshold for laser-induced gas breakdown at 10.6 μm has been investigated in the presence of a spark discharge. Lowering of the threshold was observed over that measured in the absence of the spark for several gases. In argon at 100 Torr, threshold was a factor of 3.9 lower with the spark 3.7 cm from the laser-induced breakdown region.
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A.M. Robinson (1973) studied this question.
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