Laser Damage to Spherical Targets.
Abstract
Previous research has investigated laser beam interaction with flat surfaces. Those studies have generated theoretical foundations for cratering, plasma formation and expansion, and electric and magnetic field dynamics. This thesis applies previously developed theory to understanding damage to spherical targets of 1 millimeter diameter and smaller. The targets analyzed were irradiated on one side with 300 picosecond iodine laser pulses (6 X 10 to the 15th power w/sq cm. Direct laser beam damage and surface damage to areas remote from the focal spot were analyzed. Time-resolved pinhole photography, x-ray spectroscopy, and electron microscope photography were used tso determine sequence, mode and severity of damage. Finally, a model for the creation and spread of the laser-produced plasma around the sphere is formulated, taking into account plasma pressure gradients, magnetic fields and hot-electron transport. Keywords: Unipolar arcing; Laser target damage.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1985
- Accession Number
- ADA159717
Entities
People
- C. O. Stephenson
Organizations
- Naval Postgraduate School