An optoacoustic transfer function for laser-ultrasonics: definition and its characterization for various lasers in the ablation regime
Why this work is in the frame
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Bibliographic record
Abstract
To maximize the signal-to-noise ratio of a laser-ultrasound system, one may choose to reduce the noise by using a better interferometer(and associated laser, optics, etc.), or to increase the signal by selecting a better generation laser. Given that interferometers have reached the detection limit of photon statistics, we focus our attention on ultrasound generation. To do so, we define an optoacoustic transfer function that describes the ultrasound generation efficiency of a pulsed laser on a specific material in a predetermined frequency bandwidth. On this basis, we compare the generation efficiency of various lasers on metals in the ablation regime. It is found that, at constant fluence, shorter pulses (ps) and shorter radiation wavelengths (UV) generate ultrasound more efficiently than longer pulses (ns) and longer radiation wavelengths (IR). It is also found that the generation efficiency is inversely proportional to frequency, as it should be if the generated ultrasonic pulse is a step function.
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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) | 0.001 | 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 it