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Updated: Dec 22, 2025
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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices
Published on: July 11, 2025
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Summary
This study demonstrates the first Q-switched operation of a Terbium (Tb3+)-laser. Utilizing a Tb:LiYF4 gain medium and graphene, researchers achieved efficient pulsed laser output at 544 nm.
Area of Science:
- Laser Physics
- Materials Science
- Optoelectronics
Background:
- Terbium (Tb3+)-doped materials are explored for laser applications.
- Passive Q-switching is a technique to generate high-power laser pulses.
- Graphene is investigated as a saturable absorber for lasers.
Purpose of the Study:
- To report the first Q-switched operation of a Tb3+-laser.
- To investigate the performance of a Tb:LiYF4 gain medium with a graphene saturable absorber.
- To characterize the output parameters of the Q-switched laser.
Main Methods:
- A 15% Tb:LiYF4 crystal was used as the gain medium.
- A single-layer graphene film served as the saturable absorber for passive Q-switching.
- The laser cavity was configured for Q-switched operation at 544 nm.
Main Results:
- Achieved an average output power of 744 mW at 544 nm.
- Obtained a slope efficiency of 41%.
- Generated pulses with a width of 2.9 µs at a repetition rate of 38.7 kHz, yielding a pulse energy of 19.2 µJ and peak power of 6.6 W.
Conclusions:
- Successfully demonstrated the first Q-switched Tb3+-laser.
- The combination of Tb:LiYF4 and graphene is effective for passive Q-switching.
- The results show potential for applications requiring pulsed green laser light.
