Progress in the development of an optical frequency standard at 192.6 THz based on a two-photon transition of rubidium atoms at Laval University
Why this work is in the frame
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Bibliographic record
Abstract
We have developed frequency standards at 192.6 THz (1556.2 nm) based on the two-photon transitions in rubidium at 385.2 THz (778.1 nm). These standards use a high power DFB laser at 1556.2 nm and second harmonic generation (SHG) in a periodically poled lithium niobate (PPLN) crystal. The linewidth of the DFB is reduced to the kHz level using optical feedback from a confocal cavity. The SH light is used to injection-lock a 778.1 nm laser diode which allows to observe and lock the 1556.2 nm laser to the (5S/sub 1/2/,F/sub g/=2-5D/sub 5/2/,F/sub e/=4) two-photon transition /sup 87/Rb. Allan variance measurements between identical standards show a beat stability 2.5/spl times/10/sup -13///spl tau//sup 1/2/ for observation times between 100 ms and 10 s and a level of 5.8/spl times/10/sup -14/ for 100 s is obtained. These standards have been moved recently to the National Research Council, Ottawa, Canada in order to measure their absolute frequency.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it