Material micromachining using bursts of high repetition rate picosecond pulses from a fiber laser source

Deladurantaye, Pascal; Cournoyer, Alain; Drolet, Mathieu; Desbiens, Louis; Lemieux, Dany; Briand, Martin; Taillon, Yves

doi:10.1117/12.875265

Cited by 24 publications

(11 citation statements)

References 4 publications

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“…One possibility to further increase the competitiveness of ultra short pulsed systems may be the change to fiber based amplifier technologies. Without CPA technology the pulse duration of these systems is expected to be in the range of several tens ps [5][6][7] . For metals the ablation efficiency significantly drops by about a factor of 5 when the pulse duration is raised from 10 ps up to 50 ps 8,9 , for nonmetals this drop is be less pronounced but still present 10 .…”

Section: Introductionmentioning

confidence: 99%

Optimization of the volume ablation rate for metals at different laser pulse-durations from ps to fs

et al. 2012

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Ultra short laser pulses in the ps or fs regime are used, when high requirements concerning machining quality are demanded. However, beside the quality also the process efficiency denotes a key factor for the successful transfer of this technology into real industrial applications. Based on the ablation law, holding for ultra short pulses with moderate fluences, it has been shown that the volume ablation rate can be maximized with an optimum setting of the laser parameters. The value of this maximum depends on the threshold fluence and the energy penetration depth. Both measures themselves depend on the pulse duration. For metals the dependence of the threshold fluence is well known, it stays almost constant for pulse durations up to about 10 ps and begin then to slightly increase with the pulse duration. The contrary behavior is observed for the energy penetration depth, it decreases over the whole range when the pulse duration is raised from 500 fs to 50 ps. In this paper we will show that the maximum ablation rate can therefore be increased by a factor of 1.5 to 2 when the pulse duration is reduced from 10 ps down to 500 fs.

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Section: Introductionmentioning

confidence: 99%

Optimization of the volume ablation rate for metals at different laser pulse-durations from ps to fs

et al. 2012

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“…This is because they have a number of suitable features such as high peak/average power, stable pulse characteristics from single shot to high repetition rate, good beam quality, compactness, easy thermal management, maintenance-free operation, and high reliability. In industrial applications, especially for fine material processing, short pulse fiber lasers based on a Ytterbium doped fiber (YDF) amplifier, which has a similar output wavelength as the Nd:YAG laser of 1064 nm, have been applied widely and have succeeded in penetrating the market on account of the increasing demand for cost-effectiveness and high throughput [4][5][6][7][8]. Large improvements in output power based on both pump diode laser technology and large mode area fiber (LMA) technology are key factors for the proliferation of fiber lasers in the industry.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this type of pulse pattern management in the time domain is becoming more and more complicated because of the need to meet a wide variety of process demands for various materials and accuracy requirements. Not only the pulse duration and the pulse repetition frequency but also the combination of the short pulse and burst pulses are being widely investigated for further improvement of the specific process [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

1064-nm DFB laser diode modules applicable to seeder for pulse-on-demand fiber laser systems

Yokoyama

Kan

Kageyama

et al. 2014

Optical Fiber Technology

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“…Initially, burst-mode processing was promoted by commercial companies for high-average power picosecond lasers [8][9][10] to reach higher level of machining quality and productivity. In experimental studies, it is demonstrated, therefore, that the ablation rate increases substantially if operating picosecond lasers in burst-mode regime and 20-ns inter-pulse delay instead of irradiating high-energy pulses at similar average laser power [11][12][13][14]. For bursts with shorter inter-pulse delay, it was reported that plasma shielding limits the removal efficiency [14] while longer delays cause highenergy plasma generation that is explosively remelting the surface, in turn increasing surface roughness significantly [11].…”

Section: Introductionmentioning

confidence: 96%

“…In experimental studies, it is demonstrated, therefore, that the ablation rate increases substantially if operating picosecond lasers in burst-mode regime and 20-ns inter-pulse delay instead of irradiating high-energy pulses at similar average laser power [11][12][13][14]. For bursts with shorter inter-pulse delay, it was reported that plasma shielding limits the removal efficiency [14] while longer delays cause highenergy plasma generation that is explosively remelting the surface, in turn increasing surface roughness significantly [11]. In case of pulse-train processing with very short picosecond inter-pulse delay, by contrast, electron/ion yield [15][16][17], plasma intensity [18][19][20][21], and phonon temperature [17,[22][23][24][25][26] increase as a result of enhanced photon efficiency.…”

Section: Introductionmentioning

confidence: 98%

Experimental study on double-pulse laser ablation of steel upon multiple parallel-polarized ultrashort-pulse irradiations

et al. 2016

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In this paper, double-pulse laser processing is experimentally studied with the aim to explore the influence of ultrashort pulses with very short time intervals on ablation efficiency and quality. For this, sequences of 50 double pulses of varied energy and inter-pulse delay, as adjusted between 400 fs and 18 ns by splitting the laser beam into two optical paths of different length, were irradiated to technical-grade stainless steel. The depth and the volume of the craters produced were measured in order to evaluate the efficiency of the ablation process; the crater quality was analyzed by SEM micrographs. The results obtained were compared with craters produced with sequences of 50 single pulses and energies equal to the double pulse. It is demonstrated that double-pulse processing cannot exceed the ablation efficiency of single pulses of optimal fluence, but the ablation crater surface formed smoother if inter-pulse delay was in the range between 10 ns and 18 ns. In addition, the influence of pulse duration and energy distribution between the individual pulses of the double pulse on ablation was studied. For very short inter-pulse delay, no significant effect of energy variation within the double pulse on removal rate was found, indicating that the double pulse acts as a big single pulse of equal energy. Further, the higher removal efficiency was achieved when double-pulse processing using femtosecond pulses instead of picosecond pulses.

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Material micromachining using bursts of high repetition rate picosecond pulses from a fiber laser source

Cited by 24 publications

References 4 publications

Optimization of the volume ablation rate for metals at different laser pulse-durations from ps to fs

Optimization of the volume ablation rate for metals at different laser pulse-durations from ps to fs

1064-nm DFB laser diode modules applicable to seeder for pulse-on-demand fiber laser systems

Experimental study on double-pulse laser ablation of steel upon multiple parallel-polarized ultrashort-pulse irradiations

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