Spectral dependence of optical nonlinearity in bulk GaAs, CdSe nanocrystals, and PbS nanocrystals
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Bibliographic record
Abstract
In this thesis we report, for the first time, measurements of the nonlinear refraction and absorption from the bandgap to half-bandgap region of bulk GaAs, CdSe nanocrystals and PbS nanocrystals using a tunable picosecond laser system. A good understanding of the spectral dependence of such coefficients is required to design all-optical switching components. The measured third-order refraction and two-photon absorption coefficients of GaAs match theoretical predictions well. Experimental values of the free-carrier refraction coefficient are also presented for the first time over a wide wavelength range. We validate previous conclusions that the two-photon absorption coefficient of semiconductor nanocrystals is comparable to that of bulk in the picosecond regime. Further, we present evidence that the same holds for the nonlinear refraction coefficient. Figure of merit calculations indicate that nanocrystals are usable over a wider portion of the bandgap to half-bandgap region than bulk.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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