High power neodymium-doped single-mode all-fiber laser at 922 nm using chirped tilted fiber Bragg gratings
Bibliographic record
Abstract
We report the demonstration of a neodymium-doped silica all-fiber laser delivering a single-mode output power of 17.7 W at 922 nm in continuous wave operation. The system is based on an in-house developed step-index fiber, having its core co-doped with neodymium, aluminum, phosphorus, and cerium to reduce ion clustering, hence increasing efficiency while keeping the numerical aperture low to ensure a single-mode laser operation. Unwanted amplified spontaneous emission (ASE) around 1060 nm was suppressed using custom chirped tilted fiber Bragg gratings (CTFBGs) integrated at multiple points within the fiber laser system for the first time, thus ensuring a robust all-fiber laser architecture. To the best of our knowledge, this represents the highest reported output power near 920 nm achieved in a single-mode step-index neodymium-doped silica fiber. The experimental results confirm the effectiveness of both the fiber design and the CTFBGs.
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".