Ultrahigh-Order Wave Mixing in Noncollinear High Harmonic Generation
Why this work is in the frame
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Bibliographic record
Abstract
We show that noncollinear high harmonic generation (HHG) can be fully understood in terms of nonlinear optical wave mixing. We demonstrate this by superposing on the fundamental ${\ensuremath{\omega}}_{1}$ field its second harmonic ${\ensuremath{\omega}}_{2}$ of variable intensity in a noncollinear geometry. It allows us to identify, by momentum conservation, each field's contribution (${n}_{1},{n}_{2}$) to the extreme ultraviolet emission at frequency $\ensuremath{\Omega}={n}_{1}{\ensuremath{\omega}}_{1}+{n}_{2}{\ensuremath{\omega}}_{2}$. We observe that the photon ($\ensuremath{\Omega}$) yield follows an ${n}_{2}$ power law on the ${\ensuremath{\omega}}_{2}$ intensity, before saturation. It demonstrates that, although HHG is a highly nonperturbative process, a perturbation theory can still be developed around it.
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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