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Area of Science:

Photonics and Optical Engineering
Materials Science
Nonlinear Optics

Background:

Micro-ring resonators are crucial for integrated photonics.
Tantalum pentoxide (Ta2O5) is a promising material for optical applications.
Nonlinear optical processes like four-wave mixing (FWM) are essential for wavelength generation.

Purpose of the Study:

To demonstrate efficient nonlinear wavelength generation using Ta2O5-based micro-ring resonators.
To investigate the four-wave mixing (FWM) process in Ta2O5 micro-ring cavities.
To estimate the nonlinear refractive index of Ta2O5.

Main Methods:

Fabrication of Ta2O5-based micro-ring resonators.
Characterization of resonator properties (quality factor, propagation loss, buildup factor).
Measurement of four-wave mixing (FWM) conversion efficiency under varying pump power.

Main Results:

Achieved an unloaded quality factor of 182,000 for the Ta2O5 micro-ring resonator.
Demonstrated a four-wave mixing (FWM) conversion efficiency of -30 dB with 6 mW pump power.
Estimated the nonlinear refractive index of Ta2O5 to be 1.4×10^-14 cm²/W at 1550 nm.

Conclusions:

Ta2O5-based micro-ring resonators facilitate efficient nonlinear wavelength generation.
The enhanced FWM process indicates potential for FWM-based optical parametric oscillation.
Ta2O5 is a viable material for advanced nonlinear photonic devices.