Gain functionalization of silica microresonators.

Area of Science:

• Materials Science
• Optical Engineering
• Photonics

Background:

• Silica microspheres are fundamental components in various optical devices.
• Developing micro-scale lasers with low thresholds is crucial for miniaturized photonic systems.
• Solgel films offer versatile platforms for material functionalization.

Purpose of the Study:

• To engineer low-threshold microactivity lasers utilizing erbium-doped solgel films on silica microspheres.
• To explore the potential of diverse dopants for extending the operational wavelength range.
• To investigate the influence of doping concentration and film thickness on laser dynamics.

Main Methods:

• Application of erbium-doped solgel films onto the surface of silica microspheres.
• Systematic variation of dopant types and concentrations.
• Controlled adjustment of solgel layer thickness.

Main Results:

• Successful fabrication of low-threshold microactivity lasers.
• Demonstrated tunability of laser output across a wider wavelength spectrum through different dopants.
• Achieved both continuous-wave and pulsating laser operation modes by optimizing film parameters.

Conclusions:

• Erbium-doped solgel films provide an effective method for gain functionalization of silica microsphere lasers.
• The developed micro-lasers exhibit versatile performance characteristics, including low thresholds and tunable operation.
• This approach offers a promising pathway for creating advanced, miniaturized laser devices with tailored functionalities.