Focused ion beam and transmission electron microscopy method for root cause analysis of InP ridge laser devices
Bibliographic record
Abstract
To remain competitive in industry, the continual assessment of product reliability is critical. This article discusses the focused ion beam preparation of transmission electron microscopy (TEM) specimens from InP ridge laser devices for observation and analysis of a wide range of microstructural and chemical phenomena (root cause) in reliability-tested lasers. A method is described that enables routine sectioning of ridge lasers mounted ridge up or down and/or beneath solder. The laser devices provided for reliability studies were fully wire bonded on ceramic carriers. Given the geometry, several specimens could be acquired from a single device. Here, it was imperative to thin the metal, dielectric and semiconductor layers in one specimen where the active region of the device was 1 to 3 μm below the metal contact. The structure and morphology of the devices were studied using analytical TEM with energy dispersive x-ray spectroscopy.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| 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 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".