Non-resonant power-efficient directional Nd:YAG ceramic laser using a scattering cavity

Area of Science:

• Optics and Photonics
• Materials Science
• Laser Physics

Background:

• Non-resonant lasers offer stable narrowband light but suffer from low power efficiency and omnidirectional emission.
• Their ability to use diverse gain materials (powders, films, ceramics) is hindered by practical application limitations.
• Existing non-resonant laser technologies lack efficient light confinement and directional output.

Purpose of the Study:

• To develop an effective light trap design to overcome the limitations of non-resonant lasers.
• To enhance the power efficiency and directional emission of non-resonant lasers.
• To provide a theoretical framework for understanding the performance of the proposed laser system.

Main Methods:

• A light trap design based on a spherical scattering cavity with a small entrance was proposed.
• A porous Neodymium-doped Yttrium Aluminum Garnet (Nd³⁺:YAG) ceramic was used as the gain medium.
• A theoretical model was developed to analyze the laser's operational characteristics.

Main Results:

• Directional laser emission was achieved using the proposed light trap design.
• Significant enhancements in slope efficiency were observed.
• The laser linewidth was narrowed down to 32 picometers (pm).

Conclusions:

• The developed light trap design effectively addresses the low power efficiency and omnidirectional emission issues in non-resonant lasers.
• The use of porous Nd³⁺:YAG ceramic within the spherical cavity leads to improved laser performance.
• The theoretical model provides valuable insights for predicting and optimizing non-resonant laser operation.