Casting of halide and fluoride alloys for laser windows. Semiannual technical report No. 2

Technical Report · Tue Apr 15 04:00:00 EDT 1975

OSTI ID:7273259

Newberg, R T; Pappis, J

The main objective of this program is to demonstrate the feasibility of fusion casting of alkali halides and alkaline earth fluorides for high power laser window applications. The main effort deals with the fabrication and property evaluation of the alkaline earth fluorides. During the second six months of this program high quality castings of both CaF/sub 2/ and SrF/sub 2/ were fabricated. Castings of CaF/sub 2/ were attempted in an inert atmosphere of purified argon (1 to 50 torr). Calorimetrically measured 5.25 ..mu..m bulk absorption coefficients for cast CaF/sub 2/ are being consistently attained near 0.00042/cm regardless of the starting material. In preliminary results the 5.25 ..mu..m bulk absorption coefficient of cast SrF/sub 2/ lies near 0.000067/cm for an ingot using single crystal chips as starting material and lies near 0.00017/cm for an ingot cast from purified 'reagent' grade powder. The preliminary results also show that SrF/sub 2/ is equivalent in strength to CaF/sub 2/ and that polycrystalline cast material is equivalent in strength to single crystal material.

• Research Organization: Raytheon Co., Waltham, Mass. (USA). Research Div.
• OSTI ID: 7273259
• Report Number(s): AD-A-014864; S-1864
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CASTING
ELECTROMAGNETIC RADIATION
FABRICATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFRARED RADIATION
LASERS
OPENINGS
RADIATIONS
STRONTIUM COMPOUNDS
STRONTIUM FLUORIDES
WINDOWS