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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
Published on: November 22, 2019
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Watt-level efficient 2.3 µm thulium fluoride fiber laser.
Optics Letters
|October 15, 2020
Summary
This study presents an efficient mid-infrared thulium fiber laser using upconversion pumping. The laser demonstrates promising broadband emission for advanced femtosecond fiber oscillators.
Area of Science:
- Laser Physics
- Materials Science
Background:
- Mid-infrared lasers are crucial for various applications.
- Thulium (Tm) doped fiber lasers offer potential for generating specific wavelengths.
- Upconversion pumping schemes can enable novel laser functionalities.
Purpose of the Study:
- To develop an efficient mid-infrared thulium fiber laser.
- To investigate an upconversion pumping scheme for Tm fiber lasers.
- To assess the potential for femtosecond fiber oscillators at ~2.3 µm.
Main Methods:
- Utilized a heavily Tm3+-doped zirconium fluoride glass fiber.
- Employed a tunable Ytterbium (Yb) fiber laser for pumping at 1.05 µm.
- Operated the laser on the 3H4→3H5 transition in a quasi-continuous-wave regime.
Main Results:
- Achieved 1.24 W output power at 2269-2282 nm.
- Obtained a slope efficiency of 37%.
- Demonstrated a broadband 3H4→3H5 emission with a bandwidth of 173 nm.
Conclusions:
- The developed thulium fiber laser is efficient for mid-infrared generation.
- The broadband emission is highly suitable for femtosecond fiber oscillators.
- This work advances the development of compact and efficient mid-infrared laser sources.
