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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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SESAM mode-locked Tm:Y₂O₃ ceramic laser.

Ning Zhang, Shande Liu, Zhanxin Wang

|October 27, 2022

Summary

This summary is machine-generated.

Researchers developed a tunable, ultrafast laser using thulium-doped yttrium oxide (Tm:Y₂O₃) ceramics. This novel femtosecond laser operates at 2 µm, demonstrating potential for advanced optical applications.

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Area of Science:

Laser physics
Materials science
Optical engineering

Background:

Thulium-doped materials are crucial for 2-micron lasers.
Yttrium oxide ceramics offer excellent thermal and mechanical properties.
Passively mode-locked lasers generate ultrashort pulses.

Purpose of the Study:

To demonstrate a widely tunable, passively mode-locked Tm:Y₂O₃ ceramic laser.
To investigate the laser performance in the femtosecond regime.
To assess Tm:Y₂O₃ ceramics as a gain medium for ultrafast lasers.

Main Methods:

In-band pumping of Tm:Y₂O₃ ceramic with a 1627-nm Raman fiber laser.
Utilizing a SESAM (Semiconductor Saturable Absorber Mirror) for mode-locking.
Characterizing laser output: tuning range, pulse duration, average power, and efficiency.

Main Results:

Achieved a wide tuning range of 318 nm (1833–2151 nm) in continuous-wave (CW) operation.
Generated Fourier-transform-limited pulses as short as 75 fs at ~2.06 µm.
Obtained 0.59 W average power for 178 fs pulses with 29% laser efficiency.

Conclusions:

This work presents the first mode-locked Tm:Y₂O₃ laser in the femtosecond regime.
Tm:Y₂O₃ transparent ceramics are a promising gain material for 2-micron ultrafast lasers.
The demonstrated laser performance highlights the potential for various applications requiring ultrashort pulses at 2 µm.