Ultra-high-intensity 1550-nm single junction pulsed laser diodes
Why this work is in the frame
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Bibliographic record
Abstract
New generation of eye safe military applications such as range finding, short range illumination and friend or foe identification have started to use the 1550nm wavelength region. This was encouraged by the advent of diode lasers efficient enough to approach the output power of shorter wavelength, 850nm and 905nm devices. This paper will review the actual performance and technologies of various commercially available 1550nm pulsed laser diodes. The performance and reliability of a new high brightness 1550nm semiconductor laser diode are disclosed and compared. Peak power of up to 35 Watts is achieved out of a single junction 350 micron stripe laser. Similarly, peak power in excess of 20W is achieved with a 180 micron stripe laser. This represents an optical power density of 11.1M W/cm<sup>2</sup>. Other key advantages of this new laser are a fast axis FWHM divergence of 25 degrees and less than a 10mRad divergence after fast axis collimation. The new diode technology will be explained in some detail covering aspects of design, fabrication and adaptation to meet its final target performances. A description of the optimization of chip dimensions and laser packaging is also undertaken. Finally, various ideas are offered to further improve the laser efficiency and power.
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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 | 0.001 |
| 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 it