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Frequency-doubled Q-switched 4 × 4 multicore fiber laser system
Optics Letters
|April 14, 2023
Summary
A Q-switched Yb-doped multicore fiber laser achieved 52% second harmonic generation efficiency using lithium triborate. This fiber laser architecture offers high energy capacity and may replace bulk systems for pumping high-energy lasers.
Area of Science:
- Lasers and Photonics
- Nonlinear Optics
- Fiber Optics
Background:
- High-energy lasers are crucial for scientific research and industrial applications.
- Conventional bulk solid-state lasers face limitations in energy scaling and efficiency.
- Fiber laser technology offers advantages in beam quality, thermal management, and scalability.
Purpose of the Study:
- To demonstrate frequency doubling of a Q-switched Yb-doped multicore fiber (MCF) laser.
- To achieve high second harmonic generation (SHG) efficiency and pulse energy.
- To evaluate the potential of MCF lasers as pump sources for high-energy systems.
Main Methods:
- Utilized a Q-switched Yb-doped 4x4 MCF laser system.
- Employed type I non-critically phase-matched lithium triborate (LBO) for frequency doubling.
- Operated the system at a 1 kHz repetition rate.
Main Results:
- Achieved a maximum SHG efficiency of 52%.
- Obtained a total SHG pulse energy of up to 17 mJ.
- Demonstrated the high energy capacity enabled by the dense parallel arrangement of amplifying cores.
Conclusions:
- The frequency-doubled MCF laser architecture is efficient and scalable.
- This system offers a promising alternative to bulk solid-state lasers for pumping high-energy Ti:Sapphire lasers.
- MCF lasers are suitable for high-repetition-rate and high-average-power applications.
