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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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High-efficiency, room-temperature nanosecond Yb:YAG laser.

M Siebold¹, M Loeser, U Schramm

¹Research Center Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany.

|December 10, 2009

Summary

Researchers boosted diode-pumped Ytterbium (Yb3+)-doped laser amplifier efficiency using multi-pass beam technology. This method achieves high energy ns-pulse output at room temperature, overcoming limitations of traditional methods.

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Area of Science:

Laser Physics
Materials Science

Background:

Ytterbium (Yb3+)-doped gain media are suitable for high-energy, nanosecond (ns)-pulse diode-pumped laser amplifiers.
Achieving high optical-to-optical conversion efficiencies at room temperature requires impractical fluences or complex cryogenic cooling.
Multi-passing pump and extraction beams offers a potential solution to enhance efficiency at room temperature.

Purpose of the Study:

To investigate the effectiveness of multi-passing pump and extraction beams in Yb:YAG laser amplifiers.
To demonstrate high-energy ns-pulse output and high efficiency at room temperature.

Main Methods:

Numerical simulations of multi-pass beam propagation in Yb:YAG.
Experimental setup of a diode-pumped Yb:YAG amplifier utilizing multi-pass configurations.

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Measurement of output energy and optical-to-optical efficiency.

Main Results:

Demonstrated ns-pulse output from a diode-pumped Yb:YAG amplifier.
Achieved a pulse energy of 566 mJ.
Obtained an optical-to-optical efficiency of 20%.

Conclusions:

Multi-passing pump and extraction beams significantly enhances efficiency in Yb:YAG laser amplifiers at room temperature.
This approach nearly doubles the efficiency compared to single-pass systems at this energy level.
The multi-pass technique provides a practical alternative to cryogenic cooling for high-efficiency laser operation.