Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.144120
Keywords
copper; high-speed optical techniques; light absorption; plasma heating by laser; plasma production by laser; reflectivity
Funding
- Russian Foundation for Basic Research
- International Science and Technology Center [2289]
- Natural Sciences and Engineering Research Council of Canada
- Canadian Institute for Photonic Innovations
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The reflectivity of near-infrared 150 fs laser pulses from copper targets has been measured in the intensity range of 6x10(11)-1.6x10(14) W cm(-2), showing a drop in reflectivity versus intensity as the target is heated. A simple semianalytical model of femtosecond electron heating and resultant optical absorption is developed to describe the time dependent and integral reflectivity covering the range from cold metal response to hot plasma response. The model is in good agreement with experimental ultrafast reflectivity measurements over the intensity range studied.
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