Laser heating of free electrons in wide-gap optical materials at 1064 nm
- 5 June 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (23), 2711-2713
- https://doi.org/10.1103/physrevlett.62.2711
Abstract
Free-electron absorption of 1064-nm photons is measured photoacoustically in NaCl and . The electrons are generated with a 266-nm pump pulse by two- or three-photon transitions. For a given pump pulse energy, the photoacoustic signal and the rise in lattice temperature are observed as a function of the energy of the 1064-nm pulse and found to be in agreement with the theory of free-carrier heating. Temperatures approaching the melting point are produced in these materials under prebreakdown conditions. No evidence of electron-impact ionization and ensuing avalanche formation is found up to the intrinsic damage threshold.
Keywords
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