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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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High efficiency active Q-switched laser operation with a large size rectangular core crystalline waveguide.

YongLing Hui, Qi Liu, Xing Hu

|March 17, 2021

Summary

This summary is machine-generated.

Researchers achieved high-efficiency pulsed output from a large rectangular core crystalline waveguide laser. This Q-switched laser design suppresses unwanted amplified spontaneous emission (ASE) and parasitic oscillations for broader applications.

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Area of Science:

Optics and Photonics
Laser Technology
Materials Science

Background:

Crystalline waveguides offer advantages for high-power laser development.
Q-switching is a key technique for generating high-energy laser pulses.
Suppressing amplified spontaneous emission (ASE) and parasitic oscillations is crucial for laser efficiency.

Purpose of the Study:

To experimentally demonstrate high-efficiency pulse output from a large-size rectangular core crystalline waveguide laser.
To design and fabricate a Yb:YAG/Er:YAG/V:YAG crystalline waveguide laser.
To investigate a design method for suppressing ASE and parasitic oscillations.

Main Methods:

Fabrication of a multi-layered crystalline waveguide with Yb:YAG core, Er:YAG cladding, and V:YAG outer layer.
End-pumped configuration using a continuous diode laser.
Active Q-switching technique applied to the crystalline waveguide laser.

Main Results:

Achieved high output pulse energy of 1.75mJ at 10kHz repetition rate.
Obtained a pulse width of 9.9ns, resulting in a peak power of 175kW.
Demonstrated a high optical-to-optical efficiency of 26% with excellent beam quality (M² < 1.15).

Conclusions:

The developed crystalline waveguide laser exhibits high efficiency and excellent performance.
The design strategy effectively suppresses amplified spontaneous emission (ASE) and parasitic oscillations.
This approach is applicable to various crystalline waveguide Q-switched and mode-locked lasers.