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Megawatt peak power tunable femtosecond source based on self-phase modulation enabled spectral selection
Optics Express
|February 7, 2018
Summary
Researchers developed a widely tunable femtosecond laser source using optical fibers. This new fiber laser source achieves over 400 nm wavelength tuning and high pulse energy for deep-tissue imaging applications.
Area of Science:
- Nonlinear optics
- Fiber optics
- Ultrafast lasers
Background:
- Tunable femtosecond sources are crucial for various applications, including deep-tissue imaging.
- Existing methods often rely on complex setups or have limited tuning ranges.
Purpose of the Study:
- To investigate the feasibility of a widely tunable femtosecond source using negative group-velocity dispersion (GVD) fiber.
- To achieve high pulse energy and broad wavelength tunability for advanced imaging.
Main Methods:
- Numerical and experimental investigation of self-phase modulation (SPM) dominated spectral broadening in negative GVD fibers.
- Optical filtering of spectral lobes to generate femtosecond pulses.
- Utilizing an ultrafast Er-fiber laser and dispersion-shifted fiber.
Main Results:
- Demonstrated a tunable source with >400 nm wavelength tuning range.
- Achieved ~100-fs pulses tunable between 1.3 µm and 1.7 µm with ~16-nJ pulse energy.
- Scaled energy to >100-nJ pulses with MW peak power by optimizing input energy and fiber length.
Conclusions:
- The developed fiber-based source offers a powerful and tunable femtosecond output.
- The source covers biological transmission windows (2nd and 3rd) and is suitable for multiphoton deep-tissue imaging.
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