Influence of accumulation effects on heating of silicon surface by femtosecond laser pulses

Guk, I. V.; Shandybina, G. D.; Yakovlev, E. B.

doi:10.1016/j.apsusc.2015.05.195

Cited by 15 publications

(2 citation statements)

References 21 publications

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“…It was suggested that the changes that occur in the material after the first pulse strikes largely decides the course of the consecutive pulse-material interaction [ 27 ]. In our experiment, the time interval between consecutive pulses at 1 kHz and 10 kHz is around 999 µs and 99 µs, respectively.…”

Section: Discussionmentioning

confidence: 99%

Effect of Repetition Rate on Femtosecond Laser-Induced Homogenous Microstructures

2016

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We report on the effect of repetition rate on the formation and surface texture of the laser induced homogenous microstructures. Different microstructures were micromachined on copper (Cu) and titanium (Ti) using femtosecond pulses at 1 and 10 kHz. We studied the effect of the repetition rate on structure formation by comparing the threshold accumulated pulse (Fsans-serifΣpulse) values and the effect on the surface texture through lacunarity analysis. Machining both metals at low Fsans-serifΣpulse resulted in microstructures with higher lacunarity at 10 kHz compared to 1 kHz. On increasing Fsans-serifΣpulse, the microstructures showed higher lacunarity at 1 kHz. The effect of the repetition rate on the threshold Fsans-serifΣpulse values were, however, considerably different on the two metals. With an increase in repetition rate, we observed a decrease in the threshold Fsans-serifΣpulse on Cu, while on Ti we observed an increase. These differences were successfully allied to the respective material characteristics and the resulting melt dynamics. While machining Ti at 10 kHz, the melt layer induced by one laser pulse persists until the next pulse arrives, acting as a dielectric for the subsequent pulse, thereby increasing Fsans-serifΣpulse. However, on Cu, the melt layer quickly resolidifies and no such dielectric like phase is observed. Our study contributes to the current knowledge on the effect of the repetition rate as an irradiation parameter.

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Section: Discussionmentioning

confidence: 99%

Effect of Repetition Rate on Femtosecond Laser-Induced Homogenous Microstructures

2016

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“…In this case, the models, that consider the process of heat accumulation or morphological changes of the surface between pulses, have a special place [27,28]. Such models can use a combination of quantitative and analytical methods for solving a system of equations [29].…”

Section: Introductionmentioning

confidence: 99%

Modelling of the heat accumulation process during short and ultrashort pulsed laser irradiation of bone tissue

Yakovlev¹,

Shandybina²,

Shamova³

2019

Biomed. Opt. Express

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An analytical model is presented that qualitatively describes the cooling of a biological tissue after irradiation with short and ultrashort laser pulses. The assumption that the distribution of temperature at the initial moment of surface cooling repeats the distribution of the absorbed laser energy allowed us to use the thermal conductivity approximation in both cases. The experimental results of irradiation of dry bone with nanosecond and femtosecond laser pulses are compared with the calculated data. The necessity of taking into account the change in the optical parameters of hard tissue in the field of laser irradiation during its treatment by nanosecond and femtosecond laser pulses and the key role of residual heating in its carbonization around the exposure region is shown. The application of the model to a particular biological tissue can significantly simplify the search for optimal parameters of lasers for surgical procedures.

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Role of recombination processes during multipulse femtosecond microstructuring of silicon surface

et al. 2016

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Influence of accumulation effects on heating of silicon surface by femtosecond laser pulses

Cited by 15 publications

References 21 publications

Effect of Repetition Rate on Femtosecond Laser-Induced Homogenous Microstructures

Effect of Repetition Rate on Femtosecond Laser-Induced Homogenous Microstructures

Modelling of the heat accumulation process during short and ultrashort pulsed laser irradiation of bone tissue

Role of recombination processes during multipulse femtosecond microstructuring of silicon surface

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