Total-reflection active-mirror laser with cryogenic Yb:YAG ceramics.

Area of Science:

• Materials Science
• Laser Physics
• Optics

Background:

• High-power lasers are crucial for various scientific and industrial applications.
• Conventional laser designs often face limitations due to thermal effects and material degradation.
• Developing robust and efficient laser materials is essential for advancing laser technology.

Purpose of the Study:

• To demonstrate efficient high-power laser operation using a novel cryogenic Ytterbium-doped Yttrium Aluminum Garnet (Yb:YAG) composite ceramic.
• To investigate the performance of the Yb:YAG composite ceramic under high pump density conditions.
• To evaluate the efficiency and output power of the laser system.

Main Methods:

• Utilized a cryogenic Yb:YAG composite ceramic in a total-reflection active-mirror arrangement.
• Cooled the composite ceramic directly with liquid nitrogen, eliminating the need for high-reflection coatings.
• Operated the laser system at high pump densities (up to 67 kW/cm³).

Main Results:

• Achieved efficient high-power laser operation with the cryogenic Yb:YAG composite ceramic.
• Demonstrated four-level laser operation even at high pump densities.
• Obtained a continuous wave (cw) output power of 273 W.
• Recorded an optical efficiency of 65% and a slope efficiency of 72%.

Conclusions:

• The cryogenic Yb:YAG composite ceramic enables efficient high-power laser operation.
• The material's performance under high pump density highlights its potential for demanding applications.
• This approach offers a promising pathway for developing next-generation high-power laser systems.