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Supercontinuum-based three-color three-pulse time-resolved coherent anti-Stokes Raman scattering
Optics Express
|September 15, 2015
Summary
We developed a compact three-color femtosecond laser system using photonic crystal fiber (PCF). This advanced laser enables highly sensitive, background-free measurements, pushing the boundaries of signal detection.
Area of Science:
- Optics and Photonics
- Laser Physics
- Spectroscopy
Background:
- Femtosecond laser systems are crucial for time-resolved measurements.
- Photonic crystal fibers offer unique light manipulation properties.
- Achieving multi-color, high-repetition-rate laser sources is challenging.
Purpose of the Study:
- To demonstrate a compact, three-color femtosecond laser system using PCF.
- To enable background-free time-resolved four-wave mixing measurements.
- To characterize the generated multi-color pulses and validate system performance.
Main Methods:
- Utilizing a photonic crystal fiber (PCF) as the gain medium and wavelength-selective element.
- Operating the system at a 76 MHz repetition rate, dictated by the pump laser.
- Characterizing the output pulses for near transform-limited properties.
- Performing time-resolved coherent anti-Stokes Raman scattering (TRCARS) spectroscopy.
Main Results:
- A compact three-color femtosecond laser system was successfully implemented.
- The system operates at 76 MHz, limited by the pump laser repetition rate.
- Near transform-limited multi-color pulses were extracted from the PCF.
- TRCARS measurements in bipyridyl ethylene and styrene validated the system's capability.
Conclusions:
- Photonic crystal fiber is a viable platform for compact, multi-color femtosecond laser systems.
- The demonstrated system achieves high signal detectivity for time-resolved measurements.
- The system provides a robust tool for advanced spectroscopic investigations.
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