Nondestructive interferometric determination of χ^(2)(z) spatial distribution induced in thermally poled silica glasses
Bibliographic record
Abstract
A new nondestructive characterization technique, based on a modified Maker fringe measurement, is reported that allows the complete determination of complex spatial distributions of the nonlinear χ(2)(z) coefficient in planar samples. Each sample under test was stacked together with a phase reference quartz plate to retrieve both amplitude and phase of the optical second-harmonic signal. The added phase information permits the precise determination of the location of the optically nonlinear region within the sample. Hemicylindrical lenses are used to obtain greater internal propagation angles, with an important increase in the information about the nonlinearity distribution. The technique is demonstrated for two Infrasil glass plates thermally poled in vacuum under the same temperature, voltage, and duration conditions. Very different distributions were obtained for these samples, one nonlinear layer being buried 4 μm under the anodic surface while the other was not, the latter exhibiting maximum χ(2) three times larger than the former. This difference in the χ(2)(z) distribution is explained in terms of charge injection during the poling process.
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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 | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".