A DIODE LASER FREQUENCY STANDARD USING VELOCITY MODULATION

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$75,000.00
Award Year:
1993
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
21140
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Southwest Sciences Inc.
1570 Pacheco St #e-11, Santa Fe, NM, 87501
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr David Christian Hovde
(505) 984-1322
Business Contact:
() -
Research Institution:
n/a
Abstract
THIS PROJECT WILL DEVELOP A FREQUENCY STANDARD FOR THE URANIUM-STOMIC VAPOR LASER ISOTOPE SEPARATION (U-AVLIS) PROCESS USING A VISIBLE DIODE LASER LOCKED TO AN ATOMIC RESONANCE. A KEY FEATURE IS THE USE OF THE VELOCITY MODULATION METHOD TO PROVIDE A HIGH SIGNAL/NOISE LOCKING DISCRIMINANT WITHOUT THE NEED TO MODULATE THE LASER, AND WITH THE HIGH POWERS FOR SUB-DOPPLER EFFECTS. PHASE I WILL PRODUCE XENON IONS IN AN ALTERNATING CURRENT GLOW DISCHARGE TUBE OPERATED AT REDUCED PRESSURE TO PRODUCE A POSITIVE COLUMN REGION ABOUT ONE HALF METER LONG. THE ELECTRIC FIELD IS THIS PART OF THE DISCHARGE ACCELEATES THE IONS, CAUSING A SMALL DOPPLER MODULATION OF THEIR ABSORPTION FREQUENCIES. A PORTION OF THE DIODE LASER BEAM IS DIRECTED DOWN THE BORE OF THE DISCHARGE, THEN DETECTED WITH A PHOTODIODE. THE PHOTOCURRENT IS AMPLIFIEDAND DEMODULATED AT THE DISCHARGE FREQUENCY, PRODUCING A DERIVATIVE LINESHAPE THAT WILL BE USED TO LINE LOCK THE LASER BY ELECTRONIC FEEDBACK. THE EFFECTS OF PLASMA TEMPERATURE, PRESSURE, AND COMPOSITION ON THE DEMODULATED SIGNAL/NOISE RATIO AND CENTER FREQUENCY WILL BE EXAMINED.

* information listed above is at the time of submission.

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