Dose-dependent optical properties and laser damage of helium-implanted sapphire
Why this work is in the frame
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Bibliographic record
Abstract
A series of single crystalline Al 2 O 3 samples are implanted with He + ions at different nominal fluences up to 1 × 10 18 ions/cm 2 at room temperature. The microstructure evolution and optical properties as well as laser-induced damage threshold are investigated. Optical microscopic images show that the density and amount of defects increase with increasing implantation fluence. In addition, atomic force microscopic images indicate that the surface morphologies have changed distinctly when the fluence reaches 5 × 10 17 ions/cm 2 and above. After helium implantation, broad purple and green–yellow absorption bands as well as an obvious photoluminescence band at 330 nm are observed, respectively. With the increase of implantation fluence, the intensities of absorption bands increase greatly, whereas the intensity of the photoluminescence band decreases and tends to saturation. The original strong infrared band shifts and broadens with increasing implantation fluence. The mechanism for the shift and broadening of the infrared band is discussed. After laser irradiation, it is found that the implantation fluence has great effect on the laser-induced damage threshold, which decreases significantly from 5.43 J/cm 2 to 4.62, 3.71, 2.64, and 1.80 J/cm 2 with increasing implantation fluence. A mechanism for the degradation of laser damage resistance is presented.
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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 it