Frequency stabilized coherent Brillouin random fiber laser: theory and experiments
Bibliographic record
Abstract
A coherent random fiber laser based on stimulated Brillouin scattering as gain and Rayleigh scattering as distributed feedback mirror was constructed. Its frequency is stabilized by a high finesse narrow-band Fabry-Perot interferometer (FPI) to select lasing frequency within the gain bandwidth. The light confinement within single-mode fiber enhances largely the random lasing directionality, which enables a high-quality coherent random lasing in the weak scattering region by using a milliwatt continuous-wave pump source. The FPI in the laser configuration acts as a frequency selection on the Rayleigh feedback light, and thus the random lasing frequency was locked at one of its transmission peaks giving a relative frequency fluctuation of ~2.5 × 10(-11) at 100 s. The measured frequency jitter is within ~~ ± 20 kHz over 3 hours, 3 dB linewidth is ~50 Hz and frequency noise is ~20 mHz/Hz(1/2) at 10 kHz.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".