Laser micromachining of transparent glasses and aluminum with ps-pulse bursts at 1054 nm

Herman, Peter R.; Lapczyna, Markus; Tan, Hong; Kerachian, Y.; Marjoribanks, R. S.

doi:10.1109/cleo.2000.907417

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…(1) tiny but non-negligible heat left by single ultrashort-pulse lasers will not have dissipated, creating the option for accumulating a desirable amount of residual heat, and (2) ionized atoms comprising the plasma may not have fully recombined, meaning that an opportunity is created for simmering the conditions which control plasmamediated absorption. We introduced burst-mode ultrashort-pulse laser processing as a new mode of fluence-delivery around 1999, [21][22][23][24] using amplified trains of 1 ps pulses derived from a feedback-controlled Nd:glass oscillator [25].…”

Section: Physics Relationships Of Burst-mode Ultrashort-pulse Materia...mentioning

confidence: 99%

Ultrashort-pulse burst-mode materials processing and laser surgery

S. Marjoribanks,

Tang,

Dzelzainis

et al. 2024

Pulsed Laser Processing of Materials

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Laser processing of materials and biological tissues has evolved in stages, ever since the earliest use of the laser for gross deposition of heat and for ablation. For instance, wavelength specificity was an early development that facilitated the treatment of certain biological tissues, while leaving others relatively unaffected. Ultrashort-pulse material ablation escapes the usual paradigm of heat diffusion because of the comparisons of scales: A rarefaction wave can cut through the thin layer of femtosecond-laser-heated material and carry away the absorbed energy before much heat can diffuse into the substrate. Burst-mode femtosecond laser ablation brings yet another paradigm, in which the laser fluence is divided over two disparate timescales: the ultrashort duration of a pulse and the microsecond-scale duration of a burst. This division of timescales opens new avenues for control, because much of the governing physics is about the comparison of timescales—for instance, the timescale of thermalization of heated electrons into the substrate lattice or the timescale of hydrodynamic ablation. Applications to fused silica, to in vitro cell-cultures prepared in hydrogels, and to ex vivo articular cartilage help to show what is different in the science of ultrashort-pulse burst-mode laser processing.

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Section: Physics Relationships Of Burst-mode Ultrashort-pulse Materia...mentioning

confidence: 99%

Ultrashort-pulse burst-mode materials processing and laser surgery

S. Marjoribanks,

Tang,

Dzelzainis

et al. 2024

Pulsed Laser Processing of Materials

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“…In metals burst trains are also advantageous for hole drilling. A single burst train of 400 picosecond pulses with a pulse-to-pulse separation of t = 7.5ns created clean through-holes in 200-µm thick aluminum foil [18]. High repetition rates support the hydrodynamic expansion of the ablation plume away from the hole.…”

Section: Introductionmentioning

confidence: 96%

Time dynamics of burst-train filamentation assisted femtosecond laser machining in glasses

Esser¹,

Rezaei²,

Li³

et al. 2011

Opt. Express

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Bursts of femtosecond laser pulses with a repetition rate of f = 38.5MHz were created using a purpose-built optical resonator. Single Ti:Sapphire laser pulses, trapped inside a resonator and released into controllable burst profiles by computer generated trigger delays to a fast Pockels cell switch, drove filamentation-assisted laser machining of high aspect ratio holes deep into transparent glasses. The time dynamics of the hole formation and ablation plume physics on 2-ns to 400-ms time scales were examined in time-resolved side-view images recorded with an intensified-CCD camera during the laser machining process. Transient effects of photoluminescence and ablation plume emissions confirm the build-up of heat accumulation effects during the burst train, the formation of laser-generated filaments and plume-shielding effects inside the deeply etched vias. The small time interval between the pulses in the present burst train enabled a more gentle modification in the laser interaction volume that mitigated shock-induced microcracks compared with single pulses.

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Laser micromachining of transparent glasses and aluminum with ps-pulse bursts at 1054 nm

Cited by 2 publications

References 1 publication

Ultrashort-pulse burst-mode materials processing and laser surgery

Ultrashort-pulse burst-mode materials processing and laser surgery

Time dynamics of burst-train filamentation assisted femtosecond laser machining in glasses

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