Spatial filter lens design for the main laser of the National Ignition Facility Page: 3 of 13
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Spatial filter lens design for the main laser of the National Ignition Facility
Ronald J. Korniski'
OPTICS 1 Inc.
3050 Hillcrest Drive, Suite 100
Westlake Village, CA 91362-3154
R. Edward English Jr. and John L. Miller
Lawrence Livermore National Laboratory
PO Box 808, L-527
Livermore, CA 94551
ABSTRACT
The National Ignition Facility (NIF), being designed and constructed at Lawrence Livermore National Laboratory (LLNL),
comprises 192 laser beams. The lasing medium is neodymium in phosphate glass with a fundamental frequency (I co) of
1.053pm. Sum frequency generation in a pair of conversion crystals (KDP/KD*P) will produce 18 megajoules of the third
harmonic light (3o or =0.351pm) at the target.
The purpose of this paper is to provide the lens design community with the current lens design details of the large powered
optics in the Main Laser. This paper describes the lens design configuration and design considerations of the Main Laser.
The Main Laser is 123 meters long and includes two spatial filters: one 23.5 meters and one 60 meters. These spatial filters
perform crucial beam filtering and relaying functions. We shall describe the significant lens design aspects of these spatial
filter lenses which allow them to successfully deliver the appropriate beam characteristic onto the target. For a broad
overview of NIF, please see, "Optical system design of the National Ignition Facility," by R. Edward English, et al, also
found in this volume.
1. SPATIAL LENS DESIGN CONFIGURATION
To help identify the operational subassemblies in the Main Laser, refer to Figure 1. As depicted, the Main Laser has two
spatial filter (SF) assemblies: the 23.5-meter Cavity Spatial Filter (CSF) and 60-meter Transport Spatial Filter (TS). The
powered optics in the spatial filters (grayed portions of Figure 1) are the subject of this paper.
Power Amp to
(PA) atat t,4e Target
Periscope:
Mirror (LM3)
&t Polarizer
.. --(PL)
Deombe Main Amp -Pockets Mirror netdBm
(MA) Cell (PC) (LM2)
Multipass Amplifier
Figure 1 Block diagram of NIF Main Laser Subassemblies
The spatial filter lenses are only singlets, but they have many demands on them. Being singlets, they only have a few
variables to work with to perform their functions and satisfy the optical requirements. The functions the spatial filters must
provide in the Main Laser are listed in Table 1.
This work was performed by OPTICS 1 as part of the Science Applications International Corporation Master Task
Agreement for optical engineering support to LLNL on the NIF project.
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English, R E; Korniski, R J & Miller, J L. Spatial filter lens design for the main laser of the National Ignition Facility, article, June 26, 1998; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc677718/m1/3/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.