pattern is a random intensity pattern produced by the mutual interference of a set of wavefronts.
To reduce the
speckel effecte the laser muss have the follows caracteristics :
width No polarised
emission Vibration of the
All this 4
conditions will be satisfied with a microsecond wall ablation flashlamp pumped
The Rhodamine 590
dye has a spectral bandwidth of 80 nm the superradiant amplification was
achieved by using a long and small diameter quartz tube containing the laser
dye in methanol.
No resonator was
used only a rear mirror and a flat antireflexion output coupler .
The vibration of
the laser medium is favorized by the very high shock waves during the ablation
Of the flash wall
in 1 microsecond. The laser emission is 500 nanoseconds and 300 mJ ( 600kW)