High temperature, high density opacity measurements using short pulse lasers

High - Intensity Short - Pulse Lasers

Optical ablation by high-power short-pulse lasers

Laser-induced damage threshold measurements were performed on homogeneous and multilayer dielectrics and gold-coated optics at 1053 and 526 nm for pulse durations t ranging from 140 fs to 1 ns. Gold coatings were found, both experimentally and theoretically, to be limited to 0.6 Jycm2 in the subpicosecond range for 1053-nm pulses. In dielectrics, we find qualitative differences in the morpholog...

Pressure, Temperature, and Density Measurements Using High-resolution N2 Cars

* Graduate Research Assistant. Student Member AIAA. † Professor. Senior Member AIAA. ‡ W. Grafton and Lillian B. Wilkins Professor. Associate Fellow AIAA. ABSTRACT Mean pressure, temperature, and density measurements have been made in a gas cell and along the centerline of an underexpanded jet using highresolution N2 CARS. This method takes advantage of the line-broadening effects and populatio...

Short Pulse Generation Using Semiconducfor Lasers

We have generated picosecond opfic1 pulses with very pure spectral characteristics using semiconductor lasers with monolithic cavities. Fx repetition rates less than 10 GHz, gain-switching of DFB lasers with quantum well loss-gratings is usul. Monolithic colliding pulse mode-locked semiconductor lasers are used to generate short pulses with repetition rate up to 350GHz.

Diagnosis of high-temperature implosions using low- and high-opacity krypton lines.

High-temperature laser target implosions can be achieved by using relatively thin-shell targets, and they can be diagnosed by doping the fuel with krypton and measuring K-shell and L-shell lines. Electron temperatures of up to 5 keV at modest compressed densities (~ 1-5 g/cm3) are predicted for such experiments, with ion temperatures peaking above 10 keV at the center. It is found that the prof...