Correlation of plasma ion densities and phase matching with the intensities of strong single high-order harmonics
Bibliographic record
Abstract
We studied the correlation between the intensity of the strong quasi-monochromatic harmonics (13th harmonic of indium and 17th harmonic of tin) of an 800 nm laser pulse and the characteristics of the plasma in which the harmonics were generated. By varying the intensity of the prepulse that produces the plasma from a solid target, we found an optimum plasma condition under which the intensity of the strong harmonics reached maximum. Fluid simulations suggest that this behaviour is correlated to the maximum density of singly charged ions, which are thought to be responsible for the generation of the strong single harmonics via specific plasma resonances. This result is consistent with the model recently proposed by Milošević (2007 J. Phys. B: At. Mol. Opt. Phys. 40 3367). We also examined the alternative mechanism of phase matching between the harmonics and the pump laser to explain the role of plasma resonances in the enhancement effect. An optimum plasma condition is found as in the experiments although the relation between the strong single harmonic intensity and the singly charged ion density is not straightforward. The ac Stark broadening of the plasma resonances appears to be a critical parameter for phase matching to occur.
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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".