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Title: Method of making an integral window hermetic fiber optic component

In the fabrication of igniters, actuators, detonators, and other pyrotechnic devices to be activated by a laser beam, an integral optical glass window is formed by placing a preform in the structural member of the device and then melting the glass and sealing it in place by heating at a temperature between the ceramming temperature of the glass and the melting point of the metal, followed by rapid furnace cooling to avoid devitrification. No other sealing material is needed to achieve hermeticity. A preferred embodiment of this type of device is fabricated by allowing the molten glass to flow further and form a plano-convex lens integral with and at the bottom of the window. The lens functions to decrease the beam divergence caused by refraction of the laser light passing through the window when the device is fired by means of a laser beam.
 [1];  [2];  [3];  [4]
  1. (Miamisburg, OH)
  2. (Centerville, OH)
  3. (Hamilton, OH)
  4. (Bellbrook, OH)
Issue Date:
OSTI Identifier:
United States of America as represented by Department of Energy (Washington, DC) ALO
Patent Number(s):
US 5573565
Application Number:
Contract Number:
Research Org:
Sponsoring Org:
Country of Publication:
United States
method; integral; window; hermetic; fiber; optic; component; fabrication; igniters; actuators; detonators; pyrotechnic; devices; activated; laser; beam; optical; glass; formed; placing; preform; structural; device; melting; sealing; heating; temperature; ceramming; metal; followed; rapid; furnace; cooling; avoid; devitrification; material; achieve; hermeticity; preferred; embodiment; type; fabricated; allowing; molten; flow; form; plano-convex; lens; bottom; functions; decrease; divergence; caused; refraction; light; passing; fired; means; hermetic fiber; glass window; convex lens; sealing material; fiber optic; laser beam; preferred embodiment; laser light; molten glass; light passing; beam divergence; optic component; integral window; /65/102/156/