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Breaking Barriers in Ultrafast Spectroscopy and Imaging Using 100 kHz Amplified Yb-Laser Systems
Paul M Donaldson1, Greg M Greetham1, Chris T Middleton2
1Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX11 0QX, United Kingdom.
Accounts of Chemical Research
|July 10, 2023
Summary
New Ytterbium-based lasers enable ultrafast spectroscopy and imaging advancements. These high-repetition-rate systems offer improved performance, expanding applications in chemistry and materials science.
Area of Science:
- Ultrafast spectroscopy and imaging
- Materials science
- Energy science
- Biological sciences
- Chemical sciences
Background:
- Ultrafast spectroscopy and imaging are crucial tools across diverse scientific disciplines.
- Previous generations of ultrafast spectrometers, like those based on Ti:sapphire lasers, enabled significant advancements.
- The commercialization of these technologies broadened their accessibility to researchers outside specialized fields.
Purpose of the Study:
- To highlight the transformative impact of new Ytterbium (Yb)-based lasers on ultrafast spectroscopy and imaging.
- To demonstrate how these advanced laser systems are enabling novel experiments and enhancing existing techniques.
- To showcase the shift towards higher repetition rates (100 kHz) and its implications for nonlinear spectroscopy and microscopy.
Main Methods:
- Utilizing amplified Yb-based laser systems operating at 100 kHz repetition rates.
- Employing spectrometers with shot-to-shot pulse shaping and detection capabilities.
- Leveraging parametric conversion and supercontinuum generation for optimized light pulses.
- Applying time-resolved infrared (TRIR) and two-dimensional infrared (2D IR) spectroscopy.
- Conducting two-dimensional visible (2D Vis) spectroscopy and imaging, and 2D IR imaging.
Main Results:
- Yb-based lasers offer improved compactness, efficiency, higher repetition rates, and better noise characteristics compared to Ti:sapphire systems.
- Enhanced signal-to-noise ratios and temporal spans in TRIR and 2D IR spectroscopy enable dynamical measurements from femtoseconds to seconds.
- High repetition rates facilitate spatial mapping of 2D spectra and high signal-to-noise data in 2D Vis and 2D IR imaging.
- Applications demonstrated in photovoltaic materials and spectroelectrochemistry showcase the technology's potential.
Conclusions:
- The shift to 100 kHz Yb-based laser systems represents a transformative step in nonlinear spectroscopy and imaging.
- These advancements lower technical barriers and widen the applicability of ultrafast techniques across photochemistry, photocatalysis, and photobiology.
- The technology is poised to significantly impact a broad range of scientific communities, mirroring the expansion seen with Ti:sapphire lasers.
