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Resonantly pumped high efficiency Ho:YAG laser.

Ying-Jie Shen¹, Bao-Quan Yao, Xiao-Ming Duan

¹National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, 92 West Dazhi Street, HeiLongjiang, Nan Gang District, Harbin 15001, China.

|December 5, 2012

Summary

This study demonstrates highly efficient continuous-wave (CW) and Q-switched operation of Holmium-doped Yttrium Aluminum Garnet (Ho:YAG) lasers. These lasers achieved a maximum slope efficiency of 74.8% and 58.7 W output power.

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Area of Science:

Laser Physics
Materials Science

Background:

Holmium-doped Yttrium Aluminum Garnet (Ho:YAG) lasers are crucial for various applications requiring specific wavelengths.
Efficient pumping methods are essential for optimizing laser performance and output power.

Purpose of the Study:

To investigate the performance of Ho:YAG lasers under resonant dual-end-pumping.
To achieve high efficiency and output power in both continuous-wave (CW) and Q-switched modes.

Main Methods:

Utilized two diode-pumped Thulium-doped Yttrium Lithium Fluoride (Tm:YLF) lasers operating at 1908 nm for resonant dual-end-pumping.
Characterized the laser output in terms of slope efficiency, output power, optical-to-optical conversion efficiency, pulse energy, pulse width, and peak power.

Main Results:

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Achieved a maximum slope efficiency of 74.8% in CW operation.
Obtained a maximum output power of 58.7 W at 83.2 W incident pump power, with an optical-to-optical conversion efficiency of 70.6%.
Reached a maximum pulse energy of 2.94 mJ with a 31 ns full width at half maximum (FWHM) pulse width, resulting in a peak power of approximately 94.7 kW.

Conclusions:

Resonant dual-end-pumping of Ho:YAG lasers with Tm:YLF lasers is a highly effective method for achieving high efficiency and output power.
The demonstrated performance metrics highlight the potential of these lasers for demanding applications.