Retroactive correction for white-light dispersion as an edge-detection problem in ultrafast spectroscopies
Broadband pump-probe spectroscopy is one of the most popular implementations of femtosecond time-resolved spectroscopy, due to its well-established routines of construction, operation, and data post-processing. Compensation for dispersion of broadband probe pulses covering both near-UV and visible s...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
August 8, 2024
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| In: |
Applied optics
Year: 2024, Volume: 63, Issue: 22, Pages: 6046-6051 |
| ISSN: | 2155-3165 |
| DOI: | 10.1364/AO.532878 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1364/AO.532878 Verlag, lizenzpflichtig, Volltext: https://opg.optica.org/ao/abstract.cfm?uri=ao-63-22-6046 
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| Author Notes: | Oskar Kefer, Tiago Buckup, Pavel V. Kolesnichenko |
| Summary: | Broadband pump-probe spectroscopy is one of the most popular implementations of femtosecond time-resolved spectroscopy, due to its well-established routines of construction, operation, and data post-processing. Compensation for dispersion of broadband probe pulses covering both near-UV and visible spectral range is not trivial. In such cases, retroactive numerical correction schemes are widely employed. For example, for samples in solution, this is achieved by a separate measurement of the coherent artifact. However, when a reference sample is unavailable, as is the case for most solid-state materials, retroactive characterization of the broadband probe dispersion using a similar approach can be challenging if not impossible. Here, we overcome this limitation by conceptualizing the onset of pump-probe signal as an edge and apply multi-pass wavelet convolution to broadband pump-probe spectra. This reveals prominent white-light dispersion akin to separate measurements of the coherent artifact, but free from contributions of cross-phase modulation. We demonstrate the high sensitivity of the approach, rendering it robust even to cases with small signal-to-noise ratios. We believe that the approach has great potential to be adopted in various laboratories and related industries as part of an automated dispersion-correction routine. |
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| Item Description: | Gesehen am 18.09.2024 |
| Physical Description: | Online Resource |
| ISSN: | 2155-3165 |
| DOI: | 10.1364/AO.532878 |