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Ultrafast time-resolved fluorescence by two photon absorption excitation
1Department of Chemistry, Pohang University of Science and Technology, Pohang, S. Korea.
Optics Express
|December 10, 2008
Summary
This study presents a new time-resolved fluorescence apparatus achieving 33 fs instrument response using advanced optical techniques. The system demonstrates high time-resolution for studying ultrafast fluorescence dynamics.
Area of Science:
- Spectroscopy
- Ultrafast Optics
- Physical Chemistry
Background:
- Time-resolved fluorescence spectroscopy is crucial for studying fast dynamic processes.
- Achieving high temporal resolution is essential for detailed analysis of excited-state dynamics.
- Existing methods may face limitations in time-resolution or spectral range.
Purpose of the Study:
- To develop and characterize a novel time-resolved fluorescence apparatus.
- To achieve near-perfect time-resolution for fluorescence measurements.
- To investigate the influence of crystal thickness on time-resolution.
Main Methods:
- Utilizing fluorescence upconversion by noncollinear sum frequency generation.
- Employing two-photon absorption for excitation with 20 fs pulses.
- Employing a 100 microm thick mixing crystal for initial characterization.
- Conducting experiments and numerical simulations.
Main Results:
- Achieved an instrument response of 33 fs (Full Width at Half Maximum).
- Demonstrated high time-resolution across the entire fluorescence wavelength range.
- Showed that 40 fs time-resolution is attainable with a 580 microm thick crystal for wavelengths >500 nm.
Conclusions:
- The developed apparatus offers exceptional time-resolution for fluorescence studies.
- The system is robust and effective even with thicker crystals and longer wavelengths.
- This advancement enables more precise investigations into ultrafast photophysical processes.
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