Isotope shifts and hyperfine splittings in the 6/sup 3/P/sub 2/. -->. 7/sup 3/S/sub 1/ transition of the stable Hg isotopes: an application of a new single laser scanning technique
As an application of a new single-laser/rf sideband technique were measured to provide accurate frequency guiding of a tunable cw dye laser, isotope shifts and hyperfine splittings in the 6/sup 3/P/sub 2/ ..-->.. 7/sup 3/S/sub 1/ transition of the stable Hg isotopes at 546.1 nm were measured. A high-efficiency, broadband electro-optic modulatory produces rf sidebands on a portion of the laser output. One filtered sideband is presented and locked to the resonance of a stable optical reference cavity using the output error signal to servo control the laser frequency. Thus, computer-programmed changes of the rf source frequency are directly transferred onto the laser's carrier frequency. Drifts in the cavity are measured (and corrected) when scanning the laser over an atomic resonance by periodically relocating the center of the atomic line relative to the cavity. Computer-feed forward tuning of heat laser and on/off switching of the servo locks allow frequency jumping to another line, perhaps many reference cavity orders away. (The free spectral range (FSR) itself can be measured very accurately with rf sideband techniques.) For the isotope shifts (spanning intervals of 740-930 MHz), the accuracy is 2 x 10/sup -3/ linewidths (approx.50 KHz). This is 30-50 times better than previous measurements.
- Research Organization:
- Colorado Univ., Boulder (USA)
- OSTI ID:
- 5318080
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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74 ATOMIC AND MOLECULAR PHYSICS
MERCURY ISOTOPES
HYPERFINE STRUCTURE
SPECTRAL SHIFT
LASER SPECTROSCOPY
MEASURING METHODS
STABLE ISOTOPES
ISOTOPES
SPECTROSCOPY
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