Investigation of ultrafast laser photonic material interactions: challenges for directly written glass photonics

TL;DR

This paper reviews the challenges in femtosecond laser direct-write fabrication of photonic devices in glass, focusing on material properties and laser parameters affecting device performance.

Contribution

It provides an analysis of the material and laser parameter challenges in femtosecond laser micromachining of glass for photonic device fabrication.

Findings

Fused silica and phosphate glass have different suitability for various photonic applications.

Material properties critically influence waveguide quality and device performance.

Laser parameters must be optimized for different glass types to improve fabrication outcomes.

Abstract

Currently, direct-write waveguide fabrication is probably the most widely studied application of femtosecond laser micromachining in transparent dielectrics. Devices such as buried waveguides, power splitters, couplers, gratings and optical amplifiers have all been demonstrated. Waveguide properties depend critically on the sample material properties and writing laser characteristics. In this paper we discuss the challenges facing researchers using the femtosecond laser direct-write technique with specific emphasis being placed on the suitability of fused silica and phosphate glass as device hosts for different applications.