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Efficient, low threshold, cryogenic Ho:YAG laser.

Miftar Ganija, Nikita Simakov, Alexander Hemming

|July 14, 2016

Summary

Researchers developed an efficient, conduction-cooled Ho:YAG slab laser operating at liquid nitrogen temperatures. This laser achieved a record-low threshold intensity, demonstrating excellent performance for advanced optical applications.

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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.
Efficient cooling is essential for optimizing Ho:YAG laser performance.

Purpose of the Study:

To develop an efficient, liquid-nitrogen conduction-cooled Ho:YAG slab laser.
To characterize the 1900-1911 nm absorption band of Ho:YAG at 77 K.
To demonstrate stress-free mounting techniques for Ho:YAG slabs.

Main Methods:

Development of a liquid-nitrogen conduction-cooled Ho:YAG slab laser system.
Detailed spectroscopic measurements of the Ho:YAG absorption band at 77 K.
Evaluation of laser performance metrics including mode volume, slope efficiency, and threshold.

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Main Results:

Demonstrated a stress-free conduction-cooled mounting method for the Ho:YAG slab.
Achieved a large mode volume of 42 mm³.
Obtained a slope efficiency of 75% and a threshold of 0.84 W.
Reported the lowest threshold intensity for a Ho:YAG laser to date.

Conclusions:

The developed Ho:YAG slab laser offers high efficiency and good beam quality.
Liquid-nitrogen conduction cooling is an effective method for Ho:YAG laser operation.
The achieved low threshold intensity opens possibilities for more compact and efficient laser systems.