Ultrashort Pulse Laser Technology

Nolte, Stefan; Schrempel, Frank; Dausinger, Friedrich

doi:10.1007/978-3-319-17659-8

Cited by 32 publications

(5 citation statements)

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“…In contrast, picosecond pulsed laser systems were already considered for industrial applications, as is evidenced by the first implementation of picosecond pulsed lasers in serial production by Bosch in 2007 [17,18]. Prompted by these developments and improvements in laser sources [19], the USP glass welding process was demonstrated to also work with pulses of 10 ps duration in 2007 [20]. Since then, the breadth and depth of the ongoing research on USP glass welding has incorporated a multitude of glass and material types, as well as a variety of beam focusing configurations and irradiation strategies, which will be discussed in greater detail in section 4.…”

Section: Development Of Usp Based Glass Weldingmentioning

confidence: 99%

A review on glass welding by ultra-short laser pulses

Cvecek

Dehmel

Miyamoto

et al. 2019

Int. J. Extrem. Manuf.

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Glass welding by ultra-short pulsed (USP) lasers is a piece of technology that offers high strength joints with hermetic sealing. The joints are typically formed in glass that is transparent to the laser by exploiting nonlinear absorption effects that occur under extreme conditions. Though the temperature reached during the process is on the order of a few 1000 °C, the heat affected zone (HAZ) is confined to only tens of micrometers. It is this controlled confinement of the HAZ during the joining process that makes this technology so appealing to a multitude of applications because it allows the foregoing of a subsequent tempering step that is typically essential in other glass joining techniques, thus making it possible to effectively join highly heat sensitive components. In this work, we give an overview on the process, development and applications of glass welding by USP lasers.

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Section: Development Of Usp Based Glass Weldingmentioning

confidence: 99%

A review on glass welding by ultra-short laser pulses

Cvecek

Dehmel

Miyamoto

et al. 2019

Int. J. Extrem. Manuf.

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show abstract

“…These structures can change the wettability characteristics of the material surface, as well as optical and tribological properties. Heat accumulation, caused by very high pulse repetition frequencies, has been avoided as far as possible during the generation of LIPPS [11,12].…”

Section: Introductionmentioning

confidence: 99%

Surface treatment on cobalt and titanium alloys using picosecond laser pulses in burst mode

2020

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The authors report on the results of surface treatment experiments using a solid-state amplified laser source emitting laser pulses with a pulse duration of 10 ps. The laser source allows the generation of pulse trains (bursts) with an intra-burst pulse repetition rate of 80 MHz (pulse-to-pulse time interval about 12.5 ns) with up to eight pulses per burst. In this study a wavelength of 1064 nm was used to investigate both ablation of material and laser-induced surface modifications occuring in metallic implant alloys CoCrMo (cobalt-chromium-molybdenum) and TiAlV (titanium-aluminum-vanadium) in dependence of the number of pulses and fluences per pulse in the burst. By using the burst mode, a smoothing effect occurs in a certain parameter range, resulting in very low surface roughness of the generated microstructures. It is demonstrated that at fluences per pulse which are smaller than the material-specific ablation threshold, a self-organized pore formation takes place if a defined number of pulses per burst is used. Thus, the advantage of the MHz burst mode in terms of a possible surface modification is established.

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“…Much lower intensities have been in use for materials processing without the production of ionizing radiation (2) . However, in the last few years, larger intensities of up to the order of 10 14 W/cm 2 are in use for materials processing resulting in an unwanted production of ionizing radiation (3, 4) . Advantages of such systems are, for example, extremely small holes (a few tens of μm in diameter) with nearly perfect edges due to the evaporation of the material, as opposed to holes produced by melting the material.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Emission From Materials Processing Lasers

Behrens

Pullner

Reginatto

2018

Radiation Protection Dosimetry

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The emission of laser induced X-rays from materials processing ultra-short pulsed laser systems was measured. The absolute spectral photon fluence was determined using a thermoluminescence detector based few-channel spectrometer. The spectra at 10 cm from the laser focus were in the energy region between 2 and 25 keV with mean energies of ~4-6 keV (when weighted by fluence or directional dose equivalent) and up to 13 keV (when weighted by ambient dose equivalent). The operational quantities, H·'(0.07), H·'(3) and H·*(10), were determined to be in the order of 1600-7300, 16-71 and 1-4 mSv per hour processing time, respectively, depending on the material and condition of the workpiece. The dose contribution due to photons above 30 keV was for all quantities negligible, i.e. below 10-3.

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Ultrashort Pulse Laser Technology

Cited by 32 publications

References 0 publications

A review on glass welding by ultra-short laser pulses

A review on glass welding by ultra-short laser pulses

Surface treatment on cobalt and titanium alloys using picosecond laser pulses in burst mode

X-Ray Emission From Materials Processing Lasers

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