Effects of various polishing media and techniques on the surface finish and behavior of laser glasses Page: 3 of 28
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High-power lasers are used to implode D-T targets at LIL. Results
from such implosions demonstrate the feasibility of generating electrical
1 power by inertial confinement fusion. The 30-TW SHIVA laser (the world's
most powerful laser) was designed and built at LLL for this purpose. This
first design used neodymium-doped oxide glass as the amplifying medium. A
typical laser chain (SO-in long) is shown in Fig. 1. Large increases in laser
power are anticipated by using fluoride-base laser glass instead of oxide-
base glass in the next upgrade: 200-to 300-TW NOVA solid-state laser design.
Such improvements are possible because fluoride amplifiers will have high
gain and low nonlinear refraction index. High gain is achieved with optimum
balance between emission cross section of the lasing ion and duration of the
laser pulse. A smaller cross section is generally needed with increasing
pulse width. The emission cross section is host-dependent,
The nonlinear refractive index is most important to the performance
of short-pulse high-power lasers. Glasses with low linear refractive index
will also have lower nonlinear index coefficients. Glasses with low co-
efficients propagate laser beams with less distortion. Classes of glasses in
order of low index are silicates, phosphates, fluorosilicates, fluorophos-
phates, and fluorides (BeF2 is the lowest). The advanced laser desiys will
need these fluoride glasses, which are now under intense development. Both
passive components (lenses and windows) and active components (amplifiers
and Faraday-rotation media) of the fluorophosphate glasses (LG-810, E-181,
LHG-10, etc.) are being developed commercially for the NOVA design. Scale-
up problems similar to those encountered in scaling up the silicate glasses
for the large hi-power lasers are anticipated.
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Landingham, R.L.; Casey, A.W. & Lindahl, R.O. Effects of various polishing media and techniques on the surface finish and behavior of laser glasses, article, November 7, 1978; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1203356/m1/3/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.