Rear Surface Light Emission Measurements from Laser-produced Shock Waves in Clear and Al-coated Polystyrene Targets
Abstract
The Nike KrF laser, with its very uniform focal distributions, has been used at intensities near 10(exp.14) W/cm2 to launch shock waves in polystyrene targets. The rear surface visible light emission differed between clear CH targets and targets with a thin (125 nm) Al coating on the rear side. The uncoated CH targets showed a relatively slowly rising emission followed by a sudden fall when the shock emerges, while the Al-coated targets showed a rapid rise in emission when the shock emerges followed by a slower fall -- allowing an unambiguous determination of the time the shock arrived at the rear surface. A half-aluminized target allowed us to observe this difference in a single shot. The brightness temperature of both the aluminized targets and the non-aluminized targets were slightly below but close to rear surface temperature predictions of a hydrodynamic code. A discussion of preheat effects is given.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1999
- Accession Number
- ADA483119
Entities
People
- A. N. Mostovych
- A. V. Deniz
- Andrew J. Schmitt
- Edgar A. McLean
- J. Seely
- John A. Stamper
- Stephen P.P. Obenschain
- T. Lehecka
Organizations
- United States Naval Research Laboratory