Non-resonant lasing in a deep-hole scattering cavity

Area of Science:

• Photonics and Laser Technology
• Materials Science
• Optical Engineering

Background:

• Random lasers offer unique spectral capabilities where conventional lasers are impractical.
• Challenges include high power thresholds, low efficiency, and poor light collection.
• Porous gain materials and novel cavity designs are explored to address these limitations.

Purpose of the Study:

• To demonstrate a power-efficient, easily fabricated non-resonant laser.
• To overcome the limitations of traditional random lasers.
• To enhance laser performance using a porous Nd:YAG ceramic with a deep-hole cavity.

Main Methods:

• Fabrication of a non-resonant laser cavity using a deep hole within a porous gain material.
• Utilizing diffuse reflections from the inner cavity surface for non-resonant feedback.
• Employing porous Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) ceramic as the gain medium.

Main Results:

• Successful demonstration of laser action in a counterintuitive cavity design.
• Achieved significant improvements in slope efficiency and reduced threshold power.
• Enhanced directionality of the emitted laser light was observed.
• The deep-hole cavity on porous Nd:YAG ceramic facilitated power-efficient operation.

Conclusions:

• The developed deep-hole cavity in porous gain materials offers a viable solution for power-efficient, easy-to-fabricate random lasers.
• This approach effectively overcomes key limitations of conventional random lasers.
• The use of porous Nd:YAG ceramic further enhances laser performance, paving the way for practical applications in specialized spectral regimes.