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Coupling method for laser-diode-array end-pumped solid-state amplifiers.

Deng Qinghua¹, Peng Hansheng, Sui Zhan

¹Laser Fusion Research Center, Chinese Academy of Engineering Physics, Mianyang, Sichuan, DC 621900, China. dqhaj@yahoo.com.cn

|January 6, 2009

Summary

A novel coupling method enhances high-power laser-diode-array (LDA) end-pumped amplifiers. This technique achieves high coupling efficiency and a uniform pumping field simultaneously.

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Area of Science:

Optics and Photonics
Laser Technology
Optical Engineering

Background:

High-power laser-diode-arrays (LDAs) are crucial for advanced laser systems.
Efficiently coupling light from LDAs into amplifiers remains a challenge.
Existing methods often struggle to balance coupling efficiency and beam uniformity.

Purpose of the Study:

To introduce and validate a new coupling method for high-power laser-diode-array end-pumped large-aperture amplifiers.
To achieve simultaneous high coupling efficiency and a uniform pumping field.

Main Methods:

Proposed a novel coupling configuration using a spherical distribution of LDA stacks.
Incorporated a hollow duct following the distributed LDA stacks.
Conducted comprehensive numerical simulations to model the optical performance.
Performed experimental validation to verify simulation results.

Main Results:

The proposed method demonstrates high coupling efficiency.
A highly uniform pumping field within the amplifier is achieved.
Numerical simulations and experimental results show strong agreement.

Conclusions:

The new spherical distribution and hollow duct coupling method is effective for high-power LDA end-pumped amplifiers.
This approach successfully overcomes limitations of previous coupling techniques.
It offers a viable solution for improving amplifier performance and beam quality.