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Efficient diode-array-pumped Nd:YAG and Nd:Lu:YAG lasers.

T H Allik, W W Hovis, D P Caffey

|September 15, 2009

Summary

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Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) and Neodymium-doped Lutetium Yttrium Aluminum Garnet (Nd:Lu:YAG) lasers show record efficiencies. These high-performance laser materials were achieved using diode-array side-pump geometry.

Area of Science:

Laser Physics
Materials Science
Optics

Background:

Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) is a widely used solid-state laser medium.
Transverse pumping geometries can offer advantages in laser material excitation.

Purpose of the Study:

To investigate Nd:YAG and Nd:Lu:YAG as high-efficiency laser materials.
To evaluate their performance using a diode-array side-pump geometry.

Main Methods:

Utilized a diode-array side-pump geometry for excitation.
Fabricated and tested Nd:YAG and Nd:Lu:YAG laser rods.
Measured optical slope efficiencies.

Main Results:

Achieved optical slope efficiencies of 47.7% for Nd:YAG and 50.3% for Nd:Lu:YAG.

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Demonstrated higher efficiencies than previously reported for transversely pumped YAG.

Attributed increased performance to higher pump absorption and lower losses.

Conclusions:

Nd:YAG and Nd:Lu:YAG are highly efficient laser materials when side-pumped with diode arrays.
Nd:Lu:YAG shows slightly higher efficiency than Nd:YAG under these conditions.
Optimized pumping and material properties lead to enhanced laser performance.