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17 March 2023 Laser written waveguides with engineered cross-section
Patrick S. Salter, Bangshan Sun, Zhi Kai Pong, Martin J. Booth
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Proceedings Volume PC12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII; PC124110N (2023) https://doi.org/10.1117/12.2655961
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
Femtosecond laser processing is used for writing waveguides with controllable cross-section in glass substrates. Fabricating in the heating regime with high scanning speed, we find that accurate control of the spherical aberration in the laser focus, implemented with a liquid crystal spatial light modulator, is crucial for generating precise modifications at high resolution. These laser written modifications could then be nested tightly together in a 2D multiscan approach to form waveguides with carefully controlled cross-section. We furthermore show how the cross-section can then be modified along the length of the waveguide to create a variety of mode converters.
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Patrick S. Salter, Bangshan Sun, Zhi Kai Pong, and Martin J. Booth "Laser written waveguides with engineered cross-section", Proc. SPIE PC12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII, PC124110N (17 March 2023); https://doi.org/10.1117/12.2655961
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KEYWORDS
Waveguides
Control systems
Femtosecond phenomena
Ferroelectric materials
Glasses
Light wave propagation
Liquid crystals
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