Spatiotemporal couplings in spectrally multiplexed optical parametric amplifications
Bibliographic record
Abstract
Ultrashort laser pulses with high peak intensity and good spatiotemporal characteristic are essential for attosecond pulse generation, laser-plasma acceleration and other strong-field physics research. The spectrally multiplexed optical parametric amplification (OPA) is one of the key approaches to generate pulses with high peak intensity and ultrashort pulse duration. To investigate the spatiotemporal characteristic of these ultrashort intense pulses, we present a numerical simulation of spectrally multiplexed noncollinear optical parametric amplification (NOPA) system. The spatiotemporal couplings (STCs) are caused by the inhomogeneous signal gain in spatial domain. When longer crystal is employed to achieve higher gain level, the difference of optical parametric phase (OPP) at distinct beam positions increases, leading to stronger STCs. At the same gain level, STCs in spectrally multiplexed NOPA can be effectively suppressed by adopting flat-top pump profile, where the Strehl Ratio (SR) of amplified signal is higher than that using Gaussian pump profile.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".