Incoherent laser system for producing smooth and controllable sp

Details Incoherent laser system for producing smooth and controllable sp Incoherent laser system for producing smooth and controllable sp

1987-06-05

1988-12-13

Arnold, Bruce Y.

35016211, G02B 2742, G02B 2746

Patent

active

047906278

ABSTRACT:
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 F(r) onto the target via a laser system, using partially coherent broadband light. The information needed to reproduce F(r) 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 F(r) 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 F(r), whose functional form should be controllable to within a few percent.

REFERENCES:
patent: 4521075 (1985-06-01), Obenschain et al.
Skupsky et al., "Uniformity of Energy Deposition for Laser Driven Fusion", . Appl. Phys. 54(7), Jul. 1983, pp. 3662-3671.
Schmitt, "Absolutely Uniform Illumination of Laser Fusion Pellets", Appl. Phys. Lett. 44(4), 15 Feb. 1984, pp. 399-401.
R. H. Lehmberg et al., "Use of Induced Spatial Incoherence for Uniform Illumination of Laser Fusion Targets", Optics Communications, vol. 46, No. 1, 1 Jun. 1983, pp. 27-31.
B. Badger et al., "Sirius-M: A Symmetric Illumination, Inertially Confined Direct Drive Materials Test Facility", Printed in Fusion Technology Institute, University of Wisconsin, Madison, Wisconsin, Sep. 1985, pp. IV-9 thru IV-27.
R. J. Jensen, "The KrF Laser: The Advance Toward Shorter Wavelengths", Printed in Summary of Research for the Inertial Confinement Fusion Program at Los Alamos National Lab., Los Alamos, New Mexico, Mar., 1985; pp. 23-32.
R. H. Lehmberg et al., "Use of Incoherence to Produce Smooth and Controllable Beam Profiles for Laser Fusion", Article presented at Conference on Lasers and Electro-Optics, 9-13 Jun. 1986, San Francisco, CA, Thursday Morning, Jun. 12, 1986.

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