Optical behavior of potassium ion-exchanged glass waveguides

Area of Science:

• Photonics
• Materials Science
• Optical Engineering

Background:

• Optical waveguides are fundamental components in integrated photonics.
• Ion-exchange is a common technique for fabricating optical waveguides in glass.
• Optimizing waveguide performance requires understanding ion concentration and diffusion effects.

Purpose of the Study:

• To fabricate optical waveguides using potassium ion-exchange in different glass substrates.
• To investigate the impact of potassium ion concentration on waveguide properties.
• To evaluate propagation loss and mode profiles for potential device applications.

Main Methods:

• Potassium ion-exchange process applied to Fisher Premium and Corning 0211 glass.
• Characterization of maximum index change and diffusion coefficients.
• Measurement of propagation loss in single-mode waveguides.
• Analysis of mode profiles and stress effects.

Main Results:

• Achieved a low propagation loss of 0.1 dB/cm in waveguides fabricated with Corning 0211 glass.
• Observed nearly symmetrical mode profiles using a one-step diffusion process.
• Determined variations in index change and diffusion coefficient with potassium ion concentration.

Conclusions:

• Corning 0211 glass is a suitable substrate for low-loss optical waveguide fabrication.
• The one-step diffusion process enables high-quality waveguide formation.
• The study suggests the potential for implementing wavelength-selective optical taps and combiners.