Applying Fourier transform spectroscopy to ultrafast measurements
Bibliographic record
Abstract
This research involves understanding the effects of ultrashort laser pulses, which are generally of the order of femtoseconds (1 fs = 10-15 s) or attoseconds (1 as = 10-18 s), on a material and modeling light-material interaction. Attosecond time resolution is necessary to measure electron wave packet motion, with shorter pulses being important because they give us better temporal resolution. Ultrashort pulses can resolve electron motion and electronic transport properties, which have applications in telecommunications, quantum materials, and protein folding. We aim to create ultrashort laser pulses to excite and measure the electron wave packet motion in a femtosecond (or attosecond) time scale. We perform the measurement with an experimental setup similar to Fourier transform infrared spectroscopy (FTIR), a well-developed high-resolution spectroscopic technique. FTIR can measure weak absorption bands in materials; we will combine this idea with ultrashort laser pulses to measure transient absorption properties. We introduce a semiconductor material (or a metal) in to one arm of the Michelson Interferometer to measure the electronic motion inside or off the surface of the material. Measuring and controlling electronic properties at these timescales (which is 6 orders of magnitude faster than what is currently possible) is a crucial step in developing next generation technologies. This research involves understanding the effects of ultrashort laser pulses, which are generally of the order of femtoseconds (1 fs = 10-15 s) or attoseconds (1 as = 10-18 s), on a material and modeling light-material interaction. Attosecond time resolution is necessary to measure electron wave packet motion, with shorter pulses being important because they give us better temporal resolution. Ultrashort pulses can resolve electron motion and electronic transport properties, which have applications in telecommunications, quantum materials, and protein folding. We aim to create ultrashort laser pulses to excite and measure the electron wave packet motion in a femtosecond (or attosecond) time scale. We perform the measurement with an experimental setup similar to Fourier transform infrared spectroscopy (FTIR), a well-developed high-resolution spectroscopic technique. FTIR can measure weak absorption bands in materials; we will combine this idea with ultrashort laser pulses to measure transient absorption properties. We introduce a semiconductor material (or a metal) in to one arm of the Michelson Interferometer to measure the electronic motion inside or off the surface of the material. Measuring and controlling electronic properties at these timescales (which is 6 orders of magnitude faster than what is currently possible) is a crucial step in developing next generation technologies.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.004 | 0.002 |
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".