Polarized micro-Raman studies of femtosecond laser written stress-induced optical waveguides in diamond

TL;DR

This study uses polarized Raman spectroscopy to analyze stress-induced optical waveguides in diamond created by femtosecond laser writing, revealing the stress origin of refractive index changes and guiding mechanisms.

Contribution

It introduces a novel application of polarized Raman spectroscopy to understand and optimize femtosecond laser written waveguides in diamond.

Findings

Stress in waveguides correlates with refractive index modulation.

Waveguide guiding is polarization sensitive due to stress distribution.

Technique enables better design of diamond optical devices.

Abstract

Understanding the physical mechanisms of the refractive index modulation induced by femtosecond laser writing is crucial for tailoring the properties of the resulting optical waveguides. In this work we apply polarized Raman spectroscopy to study the origin of stress-induced waveguides in diamond, produced by femtosecond laser writing. The change in the refractive index induced by the femtosecond laser in the crystal is derived from the measured stress in the waveguides. The results help to explain the waveguide polarization sensitive guiding mechanism, as well as providing a technique for their optimization.