Second-harmonic generation in a high-index doped silica micro-ring resonator

Area of Science:

• Photonics
• Materials Science
• Nonlinear Optics

Background:

• Integrated optical platforms require efficient light sources.
• Generating visible light from infrared sources is crucial for many applications.
• Micro-ring resonators offer compact and efficient photonic devices.

Purpose of the Study:

• To report the first observation of second-harmonic generation (SHG) in a high-index doped silica micro-ring resonator.
• To demonstrate a new method for efficient infrared-to-visible light conversion.
• To explore the potential of this technology for visible-light integrated optical platforms.

Main Methods:

• Fabrication of a high-index doped silica micro-ring resonator.
• Observation and characterization of second-harmonic generation (SHG).
• Utilizing a pumping wavelength sweep method for phase-matching.

Main Results:

• Demonstrated SHG in the micro-ring resonator due to symmetry-breaking-induced nonlinear susceptibility (χ(2)).
• Observed a quadratic dependence of generated SH power on the fundamental pump power.
• Achieved efficient phase-matching for maximum SHG conversion efficiency.

Conclusions:

• This work presents a novel approach for visible light generation using integrated photonics.
• The developed micro-ring resonator technology offers a new pathway for infrared-to-visible light conversion.
• This advancement is significant for the development of visible-light integrated optical platforms.