Advancing High-Power Hollow-Core Fiber Pulse Compression
Why this work is in the frame
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Bibliographic record
Abstract
Ultrafast laser science witnesses a transformative change due to the introduction of robust, high repetition rate Yb based solid state lasers. We prove the ability of hollow-core fiber (HCF) post compression to keep pace with the constantly raising average powers and pulse energies provided by state-of-the-art lasers. Over a wide range of input parameters, HCFs can provide high transmissions in the 80%–90% range with greater than 10-fold compression. First, we describe a double stage HCF setup that compresses 80 W, 2 mJ, 338 fs pulses centered at 1030 nm down to sub-two optical cycles (6 fs FWHM) with 56 W output power. This 56-fold pulse compression is paired with an overall throughput of 70% and very good long term stability (1.5% StDev over 8 hours). Next, power scaling to 300 W with variable pulse energy and repetition rate (from 100 kHz, 3 mJ to 25 kHz, 12 mJ) is presented. We compressed 1.3 ps pulses of down to 100 fs in a single HCF at 300 W level. Finally, we reveal the potential of utilizing the ultrabroadband HCF output as a spectroscopy platform that can provide various, simultaneous outputs covering a wavelength range from 430 nm up to 12 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>m.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| 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 it