title: Spatial filter pinhole for high-energy pulsed lasers.
abstract: Spatial filters are essential components for maintaining high beam quality in high-energy pulsed laser systems. The long-duration (21 ns) high-energy pulses envisioned for future inertial-confinement fusion drive systems, such as the U.S. National Ignition Facility (NIF), are likely to lead to increased plasma generation and closure effects within the pinholes in the spatial filters. The design goal for the pinhole spatial filter for the NIF design is to remove small-angle scatter in the beam to as little as a ?100-murad divergence. It is uncertain whether this design requirement can be met with a conventional pinhole design. We propose a new pinhole architecture that addresses these issues by incorporating features intended to reduce the rate of plasma generation. Initial experiments with this design have verified its performance improvement relative to a conventional pinhole design.
authors.forename: P M
authors.initials: PM
authors.lastname: Celliers
authors.forename: K G
authors.initials: KG
authors.lastname: Estabrook
authors.forename: R J
authors.initials: RJ
authors.lastname: Wallace
authors.forename: J E
authors.initials: JE
authors.lastname: Murray
authors.forename: L B
authors.initials: LB
authors.lastname: Da Silva
authors.forename: B J
authors.initials: BJ
authors.lastname: Macgowan
authors.forename: B M
authors.initials: BM
authors.lastname: Van Wonterghem
authors.forename: K R
authors.initials: KR
authors.lastname: Manes