Optimization of plasma effect in laser drilling of high aspect ratio microvias

Tokarev, V. N.; Cheshev, E. A.; Bezotosnyĭ, V V; Khomich, V. Yu.; Mikolutskiy, S. I.; Vasil’yeva, N V

doi:10.1088/1054-660x/25/5/056003

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…As can be easily shown, for the assumed Gaussian distribution of w the r1/2 radius relates with the previously introduced rf = r1/e as r1/2 = (ln2) 1/2 rf ≅ 0.83rf. The model follows up a concept of an indirect action of laser radiation on the material [40,41] that has been successfully applied to the deep (high-aspect-ratio) drilling of opaque materials. That is, the incident laser energy is at first transformed into the plasma energy (in the given case, the filament plasma) with a conversion coefficient (absorptivity) AL-P.…”

Section: = (mentioning

confidence: 99%

A Strategy for Achieving Smooth Filamentation Cutting of Transparent Materials with Ultrafast Lasers

Tokarev

Mel’nikov

2021

Applied Sciences

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A strategy is proposed for achieving a practically important mode of laser processing—a so-called “smooth” laser filamentation cutting (LFC) of transparent materials by a moving beam of a pulse-periodic pico- or subpicosecond laser. With such cutting, the surface of the sidewalls of the cuts have a significantly improved smoothness, and, as a result, the laser-cut plates have increased resistance to damage and cracking due to mechanical impacts during their subsequent use. According to the proposed analytical model, for the case when each filament is formed only by a single laser pulse, the strategy of such cutting is defined by a set of necessary conditions, whose implementation requires, in turn, a certain selection and matching with each other of irradiation parameters (pulse duration and energy, repetition rate, pitch of filaments following) and of material parameters—thermal, optical and mechanical strength constants. The model shows good agreement with experiments on sapphire and tempered glass. Besides, LFC modes are also predicted that provide very high cutting speeds of the order of 1–25 m/s or more, or allow cutting with an extremely low average laser power, but still at a speed acceptable for practical applications.

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Section: = (mentioning

confidence: 99%

A Strategy for Achieving Smooth Filamentation Cutting of Transparent Materials with Ultrafast Lasers

Tokarev

Mel’nikov

2021

Applied Sciences

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Section: Interaction Of Laser Radiation With Mattermentioning

confidence: 99%

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

McKenna¹

2016

Laser Phys. Lett.

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The International Year of Light 2015 was a landmark for the laser and optics community pointing the way to a bright future for humanity and the environment. It is with great satisfaction that Laser Physics and Laser Physics Letters have published many notable articles that have contributed to the development of light-based technologies and breakthroughs in photonics. In recognition of their high quality, we present a selection of some of the most popular articles published by Laser Physics and Laser Physics Letters throughout 2015, all of which are believed to have the potential to make a high impact on future research directions. Those chosen are recognised for their high-interest with readers and importance in the field, providing a snapshot of the broad subject coverage and international make-up of both journals.Starting this year, we will be recognising and announcing annual highlights of a previous year for both journals. We hope that you find these highlights useful and look forward to publishing more cutting-edge work in the year ahead.Summary of the highlights articles: Physics of lasers• • Experimental investigation of the light shift effect in an optical-magnetic double resonance system-an experimental scheme for studying the light shift effect in an optical magnetic double resonance system by using 4 He atoms is demonstrated [3]. • Enhanced random lasing from a colloidal CdSe quantum dot-Rh6G system-randomlaser action in a system where optical amplification is provided by colloidal CdSe quantum dots triggered by the emission from Rhodamine 6 G is reported [4].• Ultra-short pulse generation in the hybridly mode-locked erbium-doped all-fiber ring laser with a distributed polarizer-ultra-short pulse generation in a dispersion-managed erbium-doped all-fiber ring laser hybridly mode-locked with boron nitride-doped singlewalled carbon nanotubes, in co-action with a nonlinear polarization evolution in the ring cavity with a distributed polarizer, is reported for the first time [5].• Analysis of pump excited state absorption and its impact on laser efficiency-a model to quantify the effect of excited state absorption at the pump wavelength on laser efficiency, threshold and heating is developed [6]. Fibre optics and fibre lasers• 80 fs passively mode-locked Er-doped fiber laser-an Er-doped laser that has an all-fiber design, including the dispersion compensation and external compression stages, forming a robust and compact device, is reported [7].• Bound-state fiber laser mode-locked by a graphene-nanotube saturable absorbermultiple bound states in a linear-cavity fiber laser mode-locked by a mixture of graphene and single-walled carbon nanotubes is experimentally observed [8]. Jarlath McKenna Publisher, Laser Physics and Laser Physics Letters Introducing the Laser Physics and Laser Physics Letters highlights of 2015Laser Physics Letters

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“…• Optimization of plasma effect in laser drilling of high aspect ratio microvias-a simple theoretical model of heating side walls by a laser plasma, in the laser drilling of high aspect ratio microvias in metals and semiconductors, is proposed [58]. • A trace gas sensor using near infrared distributed feedback laser at 1654 nm-a costeffective compact instrument for high-stable and sensitive detection of methane based on the tunable diode laser absorption spectroscopy technique is experimentally demonstrated [59].…”

Section: Interaction Of Laser Radiation With Mattermentioning

confidence: 99%

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

McKenna¹

2016

Laser Phys.

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Optimization of plasma effect in laser drilling of high aspect ratio microvias

Cited by 9 publications

References 26 publications

A Strategy for Achieving Smooth Filamentation Cutting of Transparent Materials with Ultrafast Lasers

A Strategy for Achieving Smooth Filamentation Cutting of Transparent Materials with Ultrafast Lasers

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

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