Accession Number:

AD0784868

Title:

Double-Pulse Laser Interaction Experiments.

Descriptive Note:

Final rept. 26 Apr-26 Nov 73,

Corporate Author:

BOEING AEROSPACE CO SEATTLE WASH

Personal Author(s):

Report Date:

1974-07-01

Pagination or Media Count:

122.0

Abstract:

A double-pulse CO2 laser system has been constructed which emits 15 joules in each of the two pulses with a controllable pulse separation which can be varied from simultaneous to several seconds. With this system, high-power laser effects at solid surfaces in air are investigated at atmospheric pressure. Ignition thresholds of laser-supported detonation waves using thin foil targets are investigated for single laser pulses. The energy released in a laser-supported detonation wave leads to an air blast wave in the space near the target after the laser power has decayed. As a consequence, the gas density is reduced to approximately 1 of its ambient value and leads to an observed enhanced coupling for a second laser pulse. In the limit of perfect coupling, calculations are made of the expected temporal variation of surface temperature. Various experimental measurements are made of the high-temperature region near the target surface. Modified author abstract

Subject Categories:

  • Lasers and Masers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE