PRODUCTION OF TITANIUM-FREE SAPPHIRE FOR CESIUM CELL APPLICATIONS

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N/A
Agency Tracking Number: 9583
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1989
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Crystal Systems Inc
27 Congress St, Salem, MA, 01970
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Chandra P Khattak
 (508) 745-0088
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE CESIUM RESONANCE FILTER IS AN IMPORTANT ELEMENT FOR THE BLUE-GREEN LASER REQUIRED BY THE NAVY FOR UNDERWATER COMMUNICATION. DURING FABRICATION OF PROTOTYPES OF THIS FILTER IT WAS OBSERVED THAT THE SAPPHIRE ELEMENTS PRODUCED PULSE SIGNALS WHICH COULD NOT BE ELIMINATED. IT IS NOW KNOWN THAT TITANIUM (TI) IMPURITIES IN SAPPHIRE PRODUCED THESE PARASITIC PULSE SIGNALS IN CESIUM CELL CONFIGURATION. THE SOURCE OF TI IMPURITIES IS THE MELTSTOCK UTILIZED FOR SAPPHIRE CRYSTAL GROWTH. THE PROPOSED PROGRAM IS TO GROW 4-INCH DIAMETER SAPPHIRE CRYSTALS UTILIZING THE HEAT EXCHANGER METHOD (HEM) WITH THE EMPHASIS OF MINIMIZING TI CONTAMINATION BY SELECTION OF MELTSTOCK AND DEVELOPING CRYSTAL GROWTH PARAMETERS. IT IS ALSO INTENDED TO UTILIZE HIGH-PURITY ALUMINA POWDERS INSTEAD OF THE CONVENTIONAL SAPPHIRE CRACKLE AS MELTSTOCK FOR CRYSTAL GROWTH. SAMPLES WILL BE CHARACTERIZED FOR FLUORESCENCE FOR TI AND FOR PRESENCE OF PULSE SIGNALS IN CESIUM CELL APPLICATIONS. ONCE THE FEASIBILITY OF PRODUCING "TITANIUM-FREE" SAPPHIRE IS ESTABLISHED THESE PROCEDURES WILL BE ADOPTED FOR GROWTH OF LARGER SAPPHIRE BOULES BY HEM DURING THE PHASE II PROGRAM.

* information listed above is at the time of submission.

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