Absorption Properties of Neodymium-Doped Laser Crystals for Low Quantum Defect Pumping
Bibliographic record
Abstract
We report on the absorption coefficients of several popular Neodymium-doped laser crystals at wavelengths longer than 870 nm. In this study, high-resolution absorption spectra of Nd:YVO4, Nd:GdVO4, Nd:YAG, Nd:YLF, and the composite Nd:YVO4/Nd:GdVO4crystals were measured in the 870-920 nm range to identify suitable wavelengths for excitation. Such wavelengths correspond to the lowest quantum defects in these crystals. According to the obtained absorption spectra, the most appropriate pumping wavelengths of the individual Nd:YVO4and Nd:GdVO4crystals are 914 and 912 nm, respectively. At the same time the composite Nd:YVO4/Nd:GdVO4crystal provides a broad absorption spectrum approximately between 910 and 916 nm. Moreover, the absorption spectra of Nd:YAG and Nd:YLF crystals reveal that laser diodes at 946 nm and 908 nm can be the best choice to excite these two widely used gain media.
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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".