Observation of <sup>4</sup>F<sub>3/2</sub>→<sup>4</sup>I<sub>15/2</sub> radiative transition in Nd<sup>3+</sup> ions in GaLaS glass using frequency‐resolved PL spectroscopy
Bibliographic record
Abstract
Abstract The photoluminescence (PL) emission band corresponding to 4 F 3/2 → 4 I 15/2 transition has been revealed using a double lock‐in technique and quadrature frequency resolved spectroscopy (QFRS) at room temperature in Nd 3+ in a GaLaS glass. The band is centred around 1840 nm and has a lifetime ∼77 μs, which seems to be the same for all four radiative transitions 4 F 3/2 → 4 I J ( J = 9/2, 11/2, 13/2 and 15/2). The branching ratios β J of the four above transitions have been estimated from the PL data and agree well with the results of Judd‐Ofelt (JO) analysis. In addition to the 1840 nm band, we have observed another PL band appearing around 1580 nm and having a dominant lifetime ∼3.8 μs. This band may be identified with the radiative transition from the doublet ( 4 F 5/2 , 2 H 9/2 ) to the 4 I 15/2 manifold. The short lifetime ∼3.8 μs may be caused by effective multiphonon relaxation from the doublet to the 4 F 3/2 manifold. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.004 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
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".