High peak power diode-pumped Nd:YAG laser with Brillouin phase conjugation/pulse compression mirror
Bibliographic record
Abstract
Summary form only given. We studied a Nd:YAG laser experimental setup with phase conjugation/pulse compression SBS mirror presented. The pulses of a master oscillator (MO) with duration of 3.2 ns were directed to the first amplifier and further to the SBS cell consisting of stainless steel or glass casings filled with highly purified liquid tetrachlorides such as SiCl/sub 4/, SnCl/sub 4/, and GeCl/sub 4/. In order to optimize the SBS geometry we took into account the necessity of suppressing forward and backward SRS, self-focusing, optical breakdowns. We have observed that frequency of laser optical breakdowns on microparticles grows nonlinearly with increase of pulse repetition rate above a certain level depending on the polishing quality of the internal surface of SBS casing. Such negative effects became important due to the relative low polishing quality above. By replacing stainless steel with a glass casing with better polishing but filled with the same liquid, we could reach stable SBS with repetition rate up to I kHz while the convection flow was relatively low. For a stainless steel SBS casing filled with SiCl/sub 4/ at 100 Hz we were able to achieve 30% reflectivity. for 4-fold exceeding the SBS threshold; the reflected pulse duration was 350 ps, and the pulse-to-pulse duration stability was 20%. Further, the pulse was amplified in a double-pass amplifier up to 5 mJ and directed to a power amplifier (PA), consisting of a 7 mm /spl times/ 12 mm Nd:YAG rod.
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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 | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
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".