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All-solid-state high-power conduction-cooled Nd:YLF rod laser.

Y Hirano, T Yanagisawa, S Ueno

|December 11, 2007

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A new conduction-cooled laser design achieves high average power using an efficient side-pumping scheme and heat pipes. This development demonstrates a maximum output power of 72 W with excellent optical efficiency.

Area of Science:

Laser physics
Materials science
Thermal management

Background:

Developing high-average-power lasers is crucial for various scientific and industrial applications.
Efficient heat removal is a key challenge in high-power laser design.
Conduction-cooling offers advantages over traditional methods for laser systems.

Purpose of the Study:

To develop a high-average-power, conduction-cooled diode-pumped laser.
To implement and evaluate a novel side-pumping scheme with a prismatic pump-light confinement cavity.
To improve thermal management and pumping efficiency in Nd:YLF rod lasers.

Main Methods:

Utilized a novel conduction-cooled side-pumping scheme with a solid prismatic pump-light confinement cavity.
Employed a transparent, high-thermal-conductivity magnesium fluoride (MgF2) prism for efficient pumping and heat spreading.

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Integrated heat pipes for effective heat removal from the laser system.

Main Results:

Achieved a pumping efficiency of 85% and a thermal resistance of 0.20 °C/W for the pump cavity.
Demonstrated a maximum average output power of 72 W.
Obtained a high optical slope efficiency of 49%.

Conclusions:

The developed conduction-cooled diode-pumped Nd:YLF rod laser system is highly effective for generating high average power.
The novel side-pumping scheme with a MgF2 prism significantly enhances pumping efficiency and thermal management.
The integration of heat pipes further optimizes heat removal, enabling robust high-power laser operation.