Laser-Induced Breakdown in Liquid Helium
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We report on experiments in which focused laser light is used to induce optical breakdown in liquid helium-4. The threshold intensity has been measured over the temperature range from 1.1 to 2.8 K with light of wavelength 1064 nm. In addition to the measurement of the threshold, we have performed experiments to study how the breakdown from one pulse modifies the probability that a subsequent pulse will result in breakdown.
KeywordsLiquid helium Laser breakdown Superfluidity
We thank Wei Guo for the loan of the EKSPLA laser and Paul Leiderer for very helpful information about the earlier experiments. This work was supported in part by the US National Science Foundation through Grant No. GR5260053.
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