Near-field modification of femtosecond laser beam to enhance single-shot pulse filamentation in glass medium

Characterization of refractive index change and fabrication of long period gratings in pure silica fiber by femtosecond laser radiation

“…Filamentary propagation of femtosecond pulses provides the opportunity to write index change only in the filament region. Tuning laser parameters, it is possible to control the width and length of filament [28], which offers a unique way to better control index modification in the core of fiber. The width and the length of the filamentary voids found in this study were about 1 mm and 10 mm, respectively.…”

Formation of micro/nano-metric holes/voids in Al<inf>2</inf>O<inf>3</inf>-coated boro-aluminosilicate glass by single pulse femtosecond laser irradiation

“…Depending on the application area, researchers have proposed the formation of a large variety of micro/nanostructures on the surface of and inside both the transparent and non-transparent materials [11][12][13][14][15][16][17][18][19]. Formation of micro/nanoholes or voids in transparent materials including glasses has attracted many researchers due to their wide range application area [14][15][16][17][18].…”

“…Compared to other patterning technologies, laser sources have shown greater promise for micro/nano-patterning of materials due to their simplicity, high precision, and high throughput. Among various laser sources, femtosecond lasers are widely accepted by the researchers as well as the micro/nano-machining industry because of their non-linear properties and debris free patterning that influence the precise formation of micro/nanoscale structures in various materials [10][11][12][13][14][15][16][17][18][19].…”

“…High precision, easy processing steps, and processing time are the important parameters for selecting the patterning technology. Currently, there are several established patterning technologies for micro/nano-structuring of materials: nanoimprint lithography [1], electron beam lithography [2], ion beam lithography [3], photo lithography [4], X-ray lithography [5], physical vapour deposition [6], chemical vapour deposition [7], and laser processing technologies [8][9][10][11][12][13][14][15][16][17][18]. Compared to other patterning technologies, laser sources have shown greater promise for micro/nano-patterning of materials due to their simplicity, high precision, and high throughput.…”

Extremely high-aspect-ratio ultrafast Bessel beam generation and stealth dicing of multi-millimeter thick glass

“…The high stability of the Bessel beams and the confinement of the intense laser-matter interaction makes it possible to create with a single laser pulse a nanochannel with a diameter typically ranging between 200 and 800 nm [5] and has led to a number of advances in terms of materials processing via bulk excitation [9,10]. Stealth dicing using Bessel beams or filaments is now widely used for glass and sapphire separation [11][12][13][14]. Until here, stealth dicing has been limited to thicknesses of typically sub-mm.…”