Sub-hertz-linewidth hybrid-integrated laser for isolator-free silicon photonics
Why this work is in the frame
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Bibliographic record
Abstract
This work presents a hybrid-integrated external-cavity laser with a 0.45 Hz Lorentzian linewidth and exceptional feedback tolerance of up to −8.1dB, enabling isolator-free photonic integrated circuits. Unlike current high-Q locking configurations, our approach leverages a broadband external cavity, effectively mitigating thermorefractive noise and mode-hopping while ensuring stable operation. Through a detailed analysis of noise suppression in low-Q locking configurations, we demonstrate that extending the external cavity to increase the effective photon lifetime achieves noise suppression comparable to high-Q locking. This relaxes the stringent Q-factor requirements for self-injection locking, enabling chip-scale lasers with coherence surpassing bulky fiber lasers while maintaining compatibility with broadband external cavities. The demonstrated ultra-high coherence and strong feedback insensitivity make this laser an ideal candidate for large-scale heterogeneous photonic integration, with transformative applications in optical and quantum computing, precision sensing, and metrology.
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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) | 0.000 | 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