Thin-rod Yb:YAG amplifiers for high average and peak power lasers

Area of Science:

• Laser Physics
• Optics and Photonics
• Materials Science

Background:

• High-power ultrafast laser systems are crucial for scientific research and industrial applications.
• Traditional laser amplifier designs face limitations in power scaling and beam quality.
• Yb:YAG gain media offer advantages for high-power laser development due to their favorable spectroscopic properties.

Purpose of the Study:

• To propose and develop a high-power thin-rod Yb:YAG laser amplifier concept.
• To investigate the principle of amplifier parameter variation for efficient signal gain across different power levels.
• To experimentally validate the performance of novel thin-rod gain modules.

Main Methods:

• Conceptualization of a thin-rod Yb:YAG laser amplifier architecture.
• Development of a theoretical framework for optimizing amplifier parameters.
• Experimental implementation and characterization of three distinct thin-rod gain module designs.
• Measurement of small and strong signal gains.

Main Results:

• Successful implementation of three thin-rod gain module prototypes.
• Experimental demonstration of efficient signal gain achievable through parameter variation.
• Creation of an ultrafast laser system based on the developed modules.
• Attainment of high average power (28 W) and high pulse energy (2.5 mJ) from the laser system.

Conclusions:

• The thin-rod Yb:YAG laser amplifier design is effective for achieving high average power and pulse energy.
• The developed gain modules enable efficient signal amplification suitable for ultrafast laser applications.
• This work presents a viable pathway for developing next-generation high-power ultrafast laser sources.