Optical propeties of In 1-x GaxAs y P 1-y multiple quantum well heterostructure lasers
Bibliographic record
Abstract
Understanding the physics of Ini..GaAsPi multiple quantum well (MQW) nanostructures is essential for the development of new photonic devices such as lasers, amplifiers and modulators. In this work, optical and structural properties as well as vertical transport of three different heterostructures grown by metalorganic vapor phase epitaxy and emitting at 1 .33 tm and 1 .55 jim have been studied using continuous wave and time-resolved photoluminescence (cw-PL and TRPL) and high resolution x-ray diffraction (HRXRD). Cw-PL measurements show an anomalous PL characteristics for the structure with a thicker active layer which is discussed in terms of electron-acceptor transitions, donor-acceptor pairs, and constraint relaxation and related structural defects. The overall observed red shift with increasing temperature is interpreted as resulting from two opposite and competitive processes: band-gap shrinkage (dominant) and blue shi:ft caused by fluctuations in the QW layer thickness across the lateral sample direction. In the observed full width at half maximum, we identified a component of 8 meV as a contribution from longitudinal optical phonons. At high excitation densities, it is shown that carrier spillover and Auger recombination may be the major mechanisms limiting the quantum efficiency. For TRPL measurements, carrier cooling rates are discussed in terms of concurrent and opposite scattering mechanisms. It is found that the rise times of the QWs and the confinement region increase slightly (''2 ps) on decreasing the excitation wavelength. The observed difference is attributed to a higher initial carrier temperature associated with the shorter excitation wavelength. Comparable times of 4 ps are observed for the carrier transport and relaxation time within the confinement region and the carrier capture time in the quantum wells.
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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) | 0.001 | 0.001 |
| 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 | 0.000 |
| 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".