Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1973-10-11
1977-01-11
Moskowitz, Nelson
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 751, 350299, 350161R, G02B 523
Patent
active
040024032
ABSTRACT:
Methods and apparatus for directing a radiation pulse from a laser to a target or other selected location and preventing undesired earlier radiation from the laser having less than a selected intensity from reaching the selected location.
A beam splitter directs a major portion of the radiation pulse energy along a longer main path to a predetermined region and continuing on toward the selected location, and directs a minor portion along a shorter secondary path to the predetermined region. A reflective surface on a transparent support in the predetermined region prevents energy having less than the selected intensity from continuing on toward the selected location. The surface comprises a thin layer, as of aluminum, that remains substantially unimpaired until it is subjected to radiation having at least the selected itensity, and then is substantially removed in the area impinged by such radiation, so that when the minor portion of the radiation pulse energy along the shorter secondary path has at least the selected intensity, and thus substantially removes the impinged area of the reflective layer, the major portion of the radiation pulse reaching the predetermined region thereafter can continue on through the area of removal toward the selected location.
Alternatively, the minor energy portion actuates an electrical discharge to vaporize the reflective layer at least substantially.
REFERENCES:
patent: 3213752 (1965-10-01), Ruderman
patent: 3376089 (1968-04-01), Letter
patent: 3415591 (1968-12-01), Letter
patent: 3455627 (1969-07-01), Letter
Mallozzi et al., "X-ray Emission from Laser Generated Plasmas", 2/29/72, pp. 4-14, Final Report, vol. 2, Battella Col. Labs.
Mallozzi et al., "X-ray Emission From Laser Generated Plasmas", 5/11/72, in vitro Paper to VII International Quantum Electronics Conference, Montreal, Canada.
Applebaum David C.
Campbell Bernerd E.
Epstein Harold M.
Gallagher William J.
Mallozzi Philip J.
Battelle (Memorial Institute)
Dunson Philip M.
Moskowitz Nelson
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