High-power femtosecond infrared laser source based on noncollinear optical parametric chirped pulse amplification
Bibliographic record
Abstract
The optical parametric chirped pulse amplication (OPCPA) concept has been extended to the infrared range, providing a new approach, to our knowledge, to high-power femtosecond pulses in the 1.5 μm range. This amplifier is based on 1.05 μm pumping of bulk KTiOAsO4 with broadband phase matching in a noncollinear geometry. The output pulse energy of 1 mJ was generated with 50 nm of bandwidth by 3.8 mJ of pump energy from a 100 ps, 1 kHz Nd:YLF amplified laser. Total gain of 108 was achieved in three stages with 32% conversion of the pump energy in the final amplifier stage. Amplified pulses were compressed to 130 fs with peak intensities of 3.85 GW.
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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 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| 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 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".