Incoherent Laser System for Producing Smooth and Controllable Spatial Illumination Profiles.
Patent, Filed 5 Jun 87, patented 13 dec 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A technique called echelon-free ISI produces smooth, controllable target beam profiles with large KrF fusion lasers. The technique projects the desired time-averaged spatial profile Fr onto the target via a laser system, using partially coherent broadband light. The information needed to reproduce Fr is transported through the system by a multitude of independent coherence zones, whose diameters are small compared to scalelengths of linear aberration and gain nonuniformities as a result Fr remains relatively insensitive to these effects. Under conditions applicable to large KrF lasers, perturbations due to linear aberration, self-focusing, gain saturation, and diffraction, will result in a small broadening and smoothing of Fr, whose functional form should be controllable to within a few percent. Patents. JHD
- Lasers and Masers