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DEMONSTRATE GROWTH OF CR:LISRALF6 (CR:LISAF) CRYSTALS FOR LASER APPLICATIONS

Award Information

Agency:
National Science Foundation
Branch:
N/A
Award ID:
17299
Program Year/Program:
1992 / SBIR
Agency Tracking Number:
17299
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Crystal Systems, Inc.
27 Congress Street Salem, MA 01970
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1992
Title: DEMONSTRATE GROWTH OF CR:LISRALF6 (CR:LISAF) CRYSTALS FOR LASER APPLICATIONS
Agency: NSF
Contract: N/A
Award Amount: $50,000.00
 

Abstract:

TWO NEW TUNABLE LASER MATERIALS, CR:LICAALF6 (CR:LICAF) AND CR:LISRALF6 (CR:LISAF), DISCOVERED AT LAWRENCE LIVERMORE NATIONAL LABORATORY HAVE SHOWN INTRINSIC EFFICIENCY COMPARABLE TO ALEXANDRITE; HOWEVER, THEIR FULL POTENTIAL LASER PERFORMANCE IS LIMITED BY THE QUALITY OF CRYSTALS AVAILABLE. THE ABSORPTION AND EMISSION CROSS SECTION OF CR:LISAF ARE A FACTOR OF 4 LARGER THAN CR:LICAF. THE MAJOR IMPEDIMENT TO THE COMMERCIALIZATION OF CR:LISAF LASERS IS THE HIGH SCATTER LOSS AND CRACKING OF CRYSTALS. THE PROPOSED PROGRAM IS TO ADAPT THE HEAT EXCHANGER METHOD (HEM(STABILIZER)) FOR GROWTH OF CR:LISAF CRYSTALS. LOW TEMPERATURE GRADIENTS WILL BE UTILIZED TO MINIMIZE DEFECTS AND SCATTERING LOSSES DUE TO VARIATIONS IN STOICHIOMETRY. THE CRACKING PROBLEM IS ATTRIBUTED TO NEGATIVE THERMAL EXPANSION COEFFICIENT ALONG THE C AXIS FOR CR:LISAF AND STRESS IN THE CRYSTAL AFTER GROWTH. THE SHAPE OF THE SOLID-LIQUID INTERFACE DURING GROWTH BY HEM WILL BE CONTROLLED SUCH THAT SOLIDIFICATION OCCURS OFF THE INTERFACE IN PREFERENCE TO OFF THE CRUCIBLE WALL. IN SITU ANNEALING WILL BE CARRIED OUT TO MINIMIZE STRESS AND TEMPERATURE GRADIENT ON THE CRYSTAL DURING COOLDOWN. DETAILED CHARACTERIZATION OF CRYSTALS WILL BE CARRIED OUT ATALLIED-SIGNAL INC. THIS GROUP HAS EXTENSIVE EXPERIENCE IN CZOCHRALSKI GROWTH OF CR:LISAF AND IS A LEADING PRODUCER OF TUNABLE LASERS.

Principal Investigator:

Dr. Chandra P. Khattak
5087450088

Business Contact:

Small Business Information at Submission:

Crystal Systems, Inc
27 Congress St Salem, MA 01970

EIN/Tax ID:
DUNS: N/A
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No