Enhanced optical absorptance of metals using interferometric femtosecond ablation

Päiväsaari, Kimmo; Kaakkunen, Jarno; Kuittinen, Markku; Jääskeläinen, Timo

doi:10.1364/oe.15.013838

Cited by 60 publications

(25 citation statements)

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“…Considering the mean irradiation power of the laser to be 1.234 W (for region 1) and 1.820 W (for region 4), the average fluence is calculated to 8×10 5 W/cm 2 and 12 × 10 5 W/cm 2 , respectively. This is in accordance with the observation that, for increased number of pulses and higher fluences, nanoparticles tend to agglomerate to forms of greater size [9,12]. The results of the energy dispersion spectroscopy (EDS) analysis (Table III) show the increase in Ni, Al and (especially) Ti contents in ablated areas, which implies the generation of Ni 3 (Al, Ti).…”

Section: Resultssupporting

confidence: 88%

“…On surfaces of various metals, fs beam generates nano-and micro--structures as well as laser-induced periodic surface structures (LIPSS) [8], all of which enhance the optical absorption [9]. Thus, laser ablation with fs laser pulses is an interesting technique for the generation of nanostructures and nanoparticles (NPs) of metals and semiconductors, as well as for the deposition of nanoparticle films with peculiar physical properties [10].…”

Section: Introductionmentioning

confidence: 99%

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Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam

et al. 2009

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Due to the specific conditions of manufacturing, processing and utilization of nickel-base superalloys, the implementation of contemporary precision techniques is necessary in the research of the alloys features. Multi-component nickel-base superalloys, with about of 50% of nickel content, are commonly exploited in the conditions of high temperatures and pressures as well as in various aggressive operating environments. For successful quality control, which includes the monitoring of the changes in the alloy microstructure, fine-scale structure investigations are necessary. In this work, the samples of nickel-base superalloys have been exposed to 800 nm femtosecond laser in various operating regimes. Surface damages and dents caused by femtosecond laser pulses have been observed by optical and scanning microscopy.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam

et al. 2009

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“…Many applications of femtosecond lasers, such as high-precision materials machining [1,2], nanotechnology [3][4][5][6][7], modification of optical properties of materials [8][9][10][11][12], thin film deposition [13], modification of wetting properties of solids [14][15][16][17], producing diamond-like materials [18], laser plasma thrusters [19], and biomedicine [17,20], are based on laser ablation of solids. Although femtosecond laser ablation have been extensively studied in the past [21][22][23][24][25][26][27], many of the physical mechanisms remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Thermal response and optical absorptance of metals under femtosecond laser irradiation

Vorobyev¹,

Chen²

2011

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A detailed study on correlation between residual thermal response of a sample and its optical absorptance change due to laser-induced surface structural modifications in multi-shot femtosecond laser irradiation is performed. Experiments reveal an overall enhancement for residual thermal coupling and absorptance in air. Surprisingly, residual thermal coupling in air shows a non-monotonic dependence on pulse number and reaches a minimum value after a certain number of pulses, while these behaviors are not seen in absorptance. In vacuum, however, both suppression and enhancement are seen in residual energy coupling although absorptance is always enhanced. From these observations, it appears that air plasma plays a dominant role in thermal coupling at a relatively low number of applied pulses, while the formation of craters plays a dominant role at a high number of pulses.

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“…So far, using a x36 objective we been able to produce holes on 10 a metal layer with a minimal period of about 3 um and in single shot experiments we have been able to ablate holes, estimated from relative transmission measurements, to be as small as ~100 nm. We did try another approach [15,16,18], well fitted for a short-period pattern formation. There is strong evidence (Fig.…”

Section: Methodsmentioning

confidence: 99%

Mask-less lithography for fabrication of optical waveguides

et al. 2008

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A flexible method for fabricating shallow optical waveguides by using femtosecond laser writing of patterns on a metal coated glass substrate followed by ion-exchange is described. This overcomes the drawbacks of low index contrast and high induced stress in waveguides directly written using low-repetition rate ultrafast laser systems. When compared to conventional lithography, the technique is simpler and has advantages in terms of flexibility in the types of structures which can be fabricated.

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Enhanced optical absorptance of metals using interferometric femtosecond ablation

Cited by 60 publications

References 0 publications

Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam

Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam

Thermal response and optical absorptance of metals under femtosecond laser irradiation

Mask-less lithography for fabrication of optical waveguides

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