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1.7 µm figure-9 Tm-doped ultrafast fiber laser
Optics Express
|October 15, 2022
Summary
Researchers developed a 1.7 µm ultrafast fiber laser for deep-tissue imaging. This robust ultrashort pulse laser source is ideal for advanced three-photon microscopy applications.
Area of Science:
- Optics and Photonics
- Biomedical Imaging
- Laser Physics
Background:
- Advancements in multiphoton microscopy rely heavily on ultrafast laser technology.
- 1.7 µm ultrashort pulse lasers offer reduced scattering and absorption for deeper tissue penetration in imaging.
Purpose of the Study:
- To report a passively mode-locked figure-9 thulium-doped fiber laser operating at 1.7 µm.
- To demonstrate a tunable ultrafast laser source for enhanced deep-tissue imaging.
Main Methods:
- Utilized a figure-9 configuration with a nonlinear amplifying loop mirror.
- Incorporated a nonreciprocal phase shifter (Faraday rotator and wave plates) for phase bias control.
- Achieved positive cavity dispersion for dissipative soliton generation.
Main Results:
- Successfully generated a 1.7 µm dissipative soliton with a 3-dB spectral bandwidth of 20 nm.
- Demonstrated flexible tuning of the mode-locked spectral bandwidth by adjusting phase bias.
- Confirmed the robustness of the figure-9 thulium-doped fiber laser design.
Conclusions:
- The developed 1.7 µm ultrafast fiber laser is a promising tool for three-photon deep-tissue imaging.
- This work paves the way for robust ultrashort pulse laser sources for advanced biomedical applications.
