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Updated: Jul 8, 2026
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Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
Published on: April 25, 2019
Summary
This study showcases tunable femtosecond pulses from a diode-pumped chromium-doped lithium strontium aluminum fluoride (Cr:LiSAF) laser, achieving over 50 nm wavelength tunability. Soliton mode-locking, stabilized by a semiconductor saturable-absorber mirror, enables this performance.
Area of Science:
- Laser Physics
- Quantum Optics
- Materials Science
Background:
- Femtosecond lasers are crucial for ultrafast science.
- Wavelength tunability enhances laser applications.
- Cr:LiSAF is a promising gain medium for tunable lasers.
Purpose of the Study:
- Demonstrate wavelength tunability of femtosecond pulses from a diode-pumped Cr:LiSAF laser.
- Investigate the mode-locking mechanism and its limitations.
- Characterize the output pulse properties.
Main Methods:
- Utilized a diode-pumped Cr:LiSAF laser.
- Employed a broadband semiconductor saturable-absorber mirror for mode-locking.
- Analyzed pulse duration, output power, and wavelength range.
Main Results:
- Achieved wavelength tunability over 50 nm.
- Obtained 45-fs pulses at 105-mW average output power.
- Reached a maximum mode-locked average output power of 125 mW with 60-fs pulses.
Conclusions:
- Soliton mode-locking initiated by the saturable-absorber mirror explains the laser's performance.
- The bandwidth of Bragg mirrors limits the achievable tunability.
- The diode-pumped Cr:LiSAF laser offers versatile femtosecond pulse generation.
