Polarization enhancement in Nd:YAG microchip laser with Meta-Mirror output coupler

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• High polarization contrast is crucial for many laser applications.
• Existing methods for enhancing polarization in lasers face limitations, especially at high pump powers.
• Nd:YAG microchip lasers offer compact and efficient laser sources but can benefit from improved polarization control.

Purpose of the Study:

• To introduce a novel polarizing Meta-Mirror design.
• To investigate the effectiveness of the Meta-Mirror in enhancing the polarization contrast ratio of an Nd:YAG microchip laser.
• To evaluate the impact of the Meta-Mirror on other laser parameters such as beam quality, output power, and brightness.

Main Methods:

• Design and fabrication of a polarizing Meta-Mirror.
• Integration of the Meta-Mirror into an Nd:YAG microchip laser system.
• Experimental characterization of the laser's polarization contrast ratio under varying pump powers and polarization directions.
• Assessment of beam quality, output power, and brightness.

Main Results:

• The polarizing Meta-Mirror significantly improved the laser's polarization contrast ratio, particularly at high pump powers.
• The Meta-Mirror demonstrated low sensitivity to changes in the pump polarization direction.
• The integrated system showed enhancements in beam quality, output power, and overall beam brightness.
• The novel design proved effective in a practical laser system.

Conclusions:

• The developed polarizing Meta-Mirror is a highly effective component for enhancing laser polarization contrast.
• This technology offers a robust solution for improving Nd:YAG microchip laser performance.
• The Meta-Mirror's benefits extend beyond polarization, improving overall laser beam characteristics.