TUNABLE SOLID STATE CR:ZNWO4 LASER AT 1.083 MICRON REGION

Award Information
Agency:
National Aeronautics and Space Administration
Branch:
N/A
Amount:
$52,700.00
Award Year:
1987
Program:
SBIR
Phase:
Phase I
Contract:
N/A
Agency Tracking Number:
5105
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Excel Technology Inc
20 Westfield Rd, Coram, NY, 11727
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
N/A
Principal Investigator
 () -
Business Contact
 Dr. Triveni Srinivasan
Title: Investigator
Phone: () -
Research Institution
N/A
Abstract
THE FEASIBILITY OF BUILDING AN EXTREMELY STABLE, SPECTRALLY NARROW (300 MHZ), AND TUNABLE CW SOLID STATE LASER OPERATINGAT 1.083 MICRON WAVELENGTH REGION USING A SINGLE CRYSTAL OF CHROMIUM DOPED ZINC TUNGSTATE AS THE ACTIVE MEDIUM IS EXAMINED. THE WIDE FLUORESCENCE BANDWIDTH 800-1200 NM OF THIS MATERIAL MAKES IT A PROMISING CANDIDATE FOR NASA SPACE APPLICATION, AS AN OPTICAL PUMPING SOURCE FOR HE3 & HE4 ATOMS USED IN SPACE MAGNETOMETER. IN THE PROPOSED SCHEME, THE SYSTEM INCORPORATES A UNIQUELY DESIGNED, AN EXTREME SHORT CAVITY (5 CM), LONGITUDINALLY PUMPED CR:ZNWO4 CRYSTAL AND GRAZING INCIDENCE HOLOGRAPHIC DIFFRACTION GRATING. THE SHORT CAVITY NOT ONLY SUPPORTS MULTIPLE CAVITYROUND TRIPS DURING THE SHORT TIME IN WHICH THE POPULATION IS INVERTED BUT ALSO MAKES THE SPACING BETWEEN ADJACENT LONGITUDINAL MODES VERY LARGE. THIS RESULTS IN AN EXTREME REDUCTION OF THE AMPLIFIED SPONTANEOUS EMISSION, SINGLE MODE OPERATION OF THE SYSTEM AND GREAT STABILITY IN THE FREQUENCY OUTPUT. THE GRAZING INCIDENCE DESIGN OF THE HOLOGRAPHIC GRATING ELIMINATES THE NEED OF ANY BEAM EXPANDING OPTICS IN THE CAVITY AND ALSO PROVIDES HIGH RESOLUTION AND SPECTRALLY NARROW LINEWIDTH (300 MHZ) OVER THE ENTIRE TUNING RANGE OF THE CRYSTAL. THE SPECTRAL LINEWIDTH BEING COMPARABLE TO THE ATOMIC TRANSITION LINEWIDTH, THE SYSTEM IS CAPABLE OF LOCKING IN AT THE HELIUM RESONANCE LINES. FURTHERMORE, USING THE MIRROR (NOT THE GRATING) AS A TUNING ELEMENT, ENSURES THAT THE MODE NUMBER AND LINEWIDTH ARE PRECISELY PRESERVED DURING THE SCANNING PROCESS.

* information listed above is at the time of submission.

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