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Fast, long-scan-range pump-probe measurement based on asynchronous sampling using a dual-wavelength mode-locked fiber
Xin Zhao1, Zheng Zheng, Lei Liu
1School of Electronic and Information Engineering, Beihang University, 37 Xueyuan Rd, Beijing 100191, China.
Optics Express
|November 29, 2012
Summary
A novel pump-probe technique uses a single dual-wavelength fiber laser for fast, long-range scans. This simplified asynchronous sampling method achieves picosecond steps at millisecond speeds.
Area of Science:
- Optics and Photonics
- Ultrafast Spectroscopy
Background:
- Pump-probe spectroscopy is crucial for studying ultrafast dynamics.
- Traditional asynchronous sampling requires two synchronized lasers, complicating setups.
Purpose of the Study:
- To demonstrate a simplified, fast, and long-scan-range pump-probe scheme.
- To reduce system complexity by using a single laser source.
Main Methods:
- Experimental demonstration of a pump-probe scheme using a dual-wavelength passively mode-locked fiber laser.
- Utilizing inherent repetition frequency differences from intracavity dispersion for asynchronous sampling.
Main Results:
- Achieved a tens-of-nanoseconds delay range with picosecond scan steps.
- Enabled millisecond scan speeds.
- Significantly simplified the experimental setup compared to traditional methods.
Conclusions:
- The proposed scheme offers a simpler and more efficient approach to ultrafast pump-probe spectroscopy.
- This method is suitable for applications requiring fast, long-range delay scans.
