Optical noise reduction in a femtosecond Ti:sapphire laser
Bibliographic record
Abstract
It has been observed that the optical noise of a Ti:sapphire laser is related to the optical noise of the laser used for its optical pumping. Argon ion lasers are largely used as optical pump for solid-state lasers, such as Ti:sapphire lasers. The intensity noise of Argon laser is transferred to the beam (or pulses) emitted by the pumped laser. In this paper, we report on the optical noise reduction of a Ti:sapphire laser, operated in continuous-wave (cw) and mode-locked regimes. This effect is achieved through the optical noise reduction of the pump laser by coupling it to a passive external cavity ended by a dielectric mirror. In the mode-locked regime, the noise reduction of the low-frequency noise components, as averaged over the interval from 100 kHz to 800 kHz, is larger than 20 dB and the maximum noise reduction is larger than 34 dB. We have also compared the noise level of the Ti:sapphire laser to the noise measured when it is pumped by a solid-state laser (diode-pumped, intracavity frequency-doubled, Nd:Vanadate laser).
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".