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Qiang Hao¹, Wenxue Li, Haifeng Pan

¹State Key Laboratory of Precision Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China.

|November 13, 2009

Summary

Researchers achieved 40 W of continuous-wave (CW) power from a Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) ceramic laser. This high-power laser, end-pumped by a diode laser, represents a significant advancement in ceramic laser technology.

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Area of Science:

Laser Physics
Materials Science

Background:

Continuous-wave (CW) lasers are crucial for various scientific and industrial applications.
Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) ceramics offer advantages for high-power laser development.
Efficient pumping methods are key to achieving high laser output power.

Purpose of the Study:

To investigate the performance of a CW polycrystalline Yb:YAG ceramic laser.
To compare laser performance at different Yb(3+) ion concentrations.
To achieve high output power in an end-pumped Yb:YAG ceramic laser system.

Main Methods:

A fiber-pigtailed laser diode at 968 nm was used as the pump source.
A conventional end-pump laser cavity with two flat mirrors and varying output couplers was employed.

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The Yb:YAG ceramic laser performance was evaluated across different Yb(3+) ion concentrations.

Main Results:

A maximum CW laser output power of 40 W was achieved with a 5 mol% Yb concentration.
The laser system exhibited an M(2) factor of 5.8 under 120 W incident pump power.
This represents the highest reported output power for an end-pumped bulk Yb:YAG ceramic laser.

Conclusions:

Polycrystalline Yb:YAG ceramic is a viable material for high-power CW laser generation.
Optimizing Yb(3+) ion concentration is critical for maximizing laser output.
The developed end-pumped laser system demonstrates a new benchmark in high-power ceramic laser technology.