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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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1.21 W passively mode-locked Tm:LuAG laser.

T Feng, K Yang, J Zhao

|May 14, 2015

Summary

This study demonstrates the first watt-level passively mode-locked thulium-doped lutetium aluminum garnet (Tm:LuAG) laser. The ultrafast laser achieved 1.21 W average output power at 2022.9 nm.

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Area of Science:

Laser physics
Solid-state lasers
Ultrafast optics

Background:

Thulium-doped lasers are crucial for generating light in the 2-micrometer wavelength range.
Developing high-power ultrafast lasers is essential for various scientific and industrial applications.

Purpose of the Study:

To demonstrate a passively mode-locked Tm:LuAG bulk laser with watt-level output power.
To investigate the performance of Tm:LuAG crystals in ultrafast laser systems.

Main Methods:

Utilized a thulium-doped lutetium aluminum garnet (Tm:LuAG) crystal as the gain medium.
Employed an Indium Gallium Arsenide (InGaAs) semiconductor saturable absorber mirror (SESAM) for passive mode-locking.
Characterized the laser output power, pulse duration, and repetition rate.

Main Results:

Achieved a maximum average output power of 1.21 W at a wavelength of 2022.9 nm.
Obtained a pulse duration of 38 picoseconds (ps) at a repetition rate of 129.2 megahertz (MHz).
Successfully demonstrated watt-level output from a passively mode-locked Tm:LuAG laser.

Conclusions:

Tm:LuAG crystals are a promising material for high-power ultrafast laser development at 2 μm.
The demonstrated laser performance highlights the potential for advanced applications requiring 2-micrometer ultrashort pulses.