Wavelength tunable GHz repetition rate picosecond pulse generator using an SBS frequency comb
Bibliographic record
Abstract
We have developed a new system to generate GHz repetition rate tunable pulses in the picosecond regime at any wavelength by using self-phase-locked stimulated Brillouin scattering (SBS). The phase-locked comb at any required wavelength is generated using a single length of fiber in a ring cavity, seeded by an amplified single frequency CW pump laser. We demonstrate a coherent phase relationship between multiple cascaded Stokes waves in the cavity, which directly leads to a highly stable pulse regime. This scheme does not require the matching of frequency components to the cavity, as the frequency components are generated by SBS and not oscillating modes. The coherent pulses in the time domain are in the order of ~10 ps. The nature of the fiber leads to a stable SBS frequency shift, which is directly correlated to the repetition frequency and which is in the order of tens of GHz. Since the process is governed by SBS, it is self-starting and has a linear dependence with temperature (1 MHz/°C), which could be used for fine adjustments. Such a laser is therefore suitable for high-speed optical clocks and optical communication system, amongst other applications. This system allows the ultra-short pulses to be generated at any wavelength by simply tuning the wavelength of the seed laser. The pump power allows the pulse width to be tuned in steps, by generating additional Stokes orders. The repetition rate is altered by the choice of fiber cavity or by the choice of the orders of the SBS shifted frequencies.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 source (direct Gemma or distilled Codex), 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".