Publication

Laser-based in situ monitoring of femtosecond-laser in-bulk processing of glass

Yves Bellouard
2026

Abstract

Non-ablative femtosecond laser processing of transparent substrates involves cumulative, multi-timescale dynamics that hinder precise control of induced structural modifications. Here, we demonstrate a feedback-compatible diagnostic based on mid-infrared transmission monitoring using a continuous-wave QCL emitting at 4.46 µm. This approach enables in situ observation of structural dynamics induced by femtosecond laser irradiation at repetition rates up to 250 kHz. The technique shows sensitivity to key transient phenomena, including melting, crack formation, and bubble nucleation in glass substrates, as well as to mechanical instabilities affecting laser processing stability. This offers a robust approach towards improved control and optimization in femtosecond laser micromachining of transparent materials.

Official source

https://infoscience.epfl.ch/entities/publication/bc89b4a4-5830-4a6c-a549-3ea8be4a6180

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Yves Bellouard
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bc89b4a4-5830-4a6c-a549-3ea8be4a6180

About this result

Related concepts (32)

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light that is coherent.

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