Publication

Tailoring glass properties and microstructure with sub-100 femtosecond pulses

Yves Bellouard
2026

Abstract

Sub-100 fs pulses are desirable for various applications in glass micromachining and there exist several devices for retrospective pulse compression. The physical process behind the compression mechanism influences the pulse characteristics, in particular its temporal shape and the broadened spectrum. We investigate the impact of two compression methods on fused silica micromachining: Optical parametric amplification generates a tuneable almost Gaussian-shaped spectrum with low conversion efficiency. Self-phase modulation within a multi-pass cell broadens the spectrum with oscillations around the initial wavelength with almost no losses for the pulse compression.

Official source

https://infoscience.epfl.ch/entities/publication/f90bffa1-9c1a-4d86-ace2-96d61d41a7e9

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Yves Bellouard
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f90bffa1-9c1a-4d86-ace2-96d61d41a7e9

About this result

Related concepts (32)

Lossy compression

In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size for storing, handling, and transmitting content. The different versions of the photo of the cat on this page show how higher degrees of approximation create coarser images as more details are removed. This is opposed to lossless data compression (reversible data compression) which does not degrade the data.

Data compression

In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces bits by removing unnecessary or less important information.

Mode locking

Mode locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds (10−12 s) or femtoseconds (10−15 s). A laser operated in this way is sometimes referred to as a femtosecond laser, for example, in modern refractive surgery. The basis of the technique is to induce a fixed phase relationship between the longitudinal modes of the laser's resonant cavity. Constructive interference between these modes can cause the laser light to be produced as a train of pulses.

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Tailoring glass properties and microstructure with sub-100 femtosecond pulses

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