Laser-written scalable sapphire integrated photonics platform
Abstract
In this paper, we demonstrate the integration of photonic devices on sapphire substrates using multi-layer depressed cladding waveguides at both 780 nm and 1550 nm. The devices are up to 10-cm long and written at depths down to 400 um. The propagation losses for single-mode guiding are ~ 0.6 dB/cm at 780 nm and ~ 0.7 dB/cm at 1550 nm. A number of structures have been fabricated with simultaneous single-mode and polarization independent operation: evanescently coupled waveguide arrays, Y-branch splitters, Mach-Zehnder interferometers, and a 2x2 directional-coupler. All the devices were fabricated using adaptive optics-assisted femtosecond laser direct writing with a customized laser writing algorithm. This work enables the integration of single-mode sapphire photonics devices in a scalable manner, enabling many applications in communications, imaging, computing, and sensing.
Cite
@article{arxiv.2409.13110,
title = {Laser-written scalable sapphire integrated photonics platform},
author = {Mohan Wang and Patrick S. Salter and Frank P. Payne and Tongyu Liu and Martin J. Booth and Julian A. J. Fells},
journal= {arXiv preprint arXiv:2409.13110},
year = {2024}
}