An investigation on 800 nm femtosecond laser ablation of K9 glass in air and vacuum

Xu, Shuxin; Yao, Caizhen; Hongqiang, Dou; Liao, Wei; Li, Xiaoyang; Ding, Renjie; Zhang, Lijuan; Liu, Hao; Yuan, Xiaodong; Zu, Xiaotao

doi:10.1016/j.apsusc.2017.02.043

Cited by 27 publications

(5 citation statements)

References 34 publications

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“…Besides the HSFL structures, oriented perpendicular to the laser polarization, low spatial frequency ripples parallel to the laser polarization (LSFL-||) are typically formed for higher fluences or number of pulses on silica-based glasses 32 – 35 . Their formation mechanism was explained by Sipe theory representing an analytical solution for electromagnetic wave interaction with rough surface 36 and further expanded by taking into account the changes of the optical properties of fused silica during ultrashort laser irradiation 33 .…”

Section: Introductionmentioning

confidence: 99%

“…In this article, the formation mechanisms of several types of LIPSS (LSFL-||, LSFL-⊥ and HSFL), commonly observed on the surface of dielectrics 32 – 35 , are elucidated. The numerical results are supported by ex-situ surface imaging and by in-situ time-resolved pump-probe diffraction experiments.…”

Section: Introductionmentioning

confidence: 99%

“…In the proposed method, Maxwell’s equations are coupled with a rate equation, taking into account the ionization mechanisms and the transient changes of fused silica’s optical properties. Therefore, this self-consistent approach allows us to investigate directly the dynamics of the electronic modification in a more appropriate way than the linear electromagnetic or the analytic Sipe-theory based approaches 19 , 22 , 35 . In order to take into account the multipulse accumulation effects, a feedback mechanism providing the void-like structure growth into the nanogratings based on the near-field enhancements is proposed.…”

Section: Introductionmentioning

confidence: 99%

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Spontaneous periodic ordering on the surface and in the bulk of dielectrics irradiated by ultrafast laser: a shared electromagnetic origin

Rudenko

Colombier

Höhm

et al. 2017

Sci Rep

168

166

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Periodic self-organization of matter beyond the diffraction limit is a puzzling phenomenon, typical both for surface and bulk ultrashort laser processing. Here we compare the mechanisms of periodic nanostructure formation on the surface and in the bulk of fused silica. We show that volume nanogratings and surface nanoripples having subwavelength periodicity and oriented perpendicular to the laser polarization share the same electromagnetic origin. The nanostructure orientation is defined by the near-field local enhancement in the vicinity of the inhomogeneous scattering centers. The periodicity is attributed to the coherent superposition of the waves scattered at inhomogeneities. Numerical calculations also support the multipulse accumulation nature of nanogratings formation on the surface and inside fused silica. Laser surface processing by multiple laser pulses promotes the transition from the high spatial frequency perpendicularly oriented nanoripples to the low spatial frequency ripples, parallel or perpendicular to the laser polarization. The latter structures also share the electromagnetic origin, but are related to the incident field interference with the scattered far-field of rough non-metallic or transiently metallic surfaces. The characteristic ripple appearances are predicted by combined electromagnetic and thermo-mechanical approaches and supported by SEM images of the final surface morphology and by time-resolved pump-probe diffraction measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spontaneous periodic ordering on the surface and in the bulk of dielectrics irradiated by ultrafast laser: a shared electromagnetic origin

Rudenko

Colombier

Höhm

et al. 2017

Sci Rep

168

166

View full text Add to dashboard Cite

show abstract

“…There were nonthermal and thermal ablations in laser processing of single-crystal LaB 6 , where the nonthermal and thermal threshold fluences were represented by F th1 and F th2 , respectively. 23,24 The single-shot laser ablation corresponded to the single-shot threshold fluence F th (1), and bursts of N consecutive laser pulses ablation corresponded to the multi-shot threshold fluence F th (N).…”

Section: Ablation Threshold Analysismentioning

confidence: 99%

Controllable preparation of microtips array on (100) crystal plane of single‐crystal lanthanum hexaboride ceramic

Zhou

Zhang

Zhang³

et al. 2021

J Am Ceram Soc.

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Single-crystal lanthanum hexaboride (LaB 6 ) is a functional ceramic with a low work function, strong resistance to ion bombardment, reasonable conductivity, and low evaporation rate. This study explored the use of a femtosecond laser combined with electrochemical etching to prepare a microtips array on the (100) crystal plane of a single-crystal LaB 6 ceramic. The ablation threshold of single-crystal LaB 6 , processed using a femtosecond laser, was studied in addition to the microstructure and field emission properties of the sample. The study results proved that selecting a peak laser fluence F 0 of 9.9 J/cm 2 could help avoid the thermal ablation of the microtips array. The phase, crystal structure, and elemental composition of the microtips array on the single-crystal LaB 6 were unchanged. The prepared microtips array of a field emitter had a curvature radius, height, and minimum spacing of 0.4, 8, and 20 μm, respectively. The field emission test results showed that the starting electric field strength and fieldemission current density were 2.45 V/μm and 2.07 A/cm 2 , respectively, when the applied electric field strength was 5.2 V/μm. In addition, the field enhancement factor was 1493, indicating an excellent field emission stability.

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“…Therefore, it is necessary to increase the efficiency (ablated material/unit energy/unit of time) of the micromachining process as much as possible to fulfil the necessary requirements. Several techniques exist for processing materials with femtosecond pulses which include: direct ablation in air [14,15], back side wet etching [16][17][18], spatiotemporally enhanced focusing [19,20], laser-assisted etching (LAE) [21][22][23][24][25][26], and gas-assisted processing [27][28][29]. Although the techniques presented above all have their advantages and disadvantages, when talking about cutting/drilling deep (> 500 µm) structures inside the material, all of the stated techniques fall short (with the exception of LAE), and ultimately fall victim to slow processing and heat-affected zones around the cut.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Beam Transformation Effects in Water, Enabling Increased Throughput Micromachining in Transparent Materials

et al. 2019

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Femtosecond lasers are widely applied in scientific and industrial fields. Recent trends in the laser market show decreasing prices for femtosecond units, which will ultimately lead to the opening of new markets that were inaccessible in the past due to the high costs of such systems. To this end, new techniques that enable micromachining of materials with increased efficiency are interesting. In this article, we demonstrate a technique that may be used for cutting and drilling various materials. By placing a layer of water on top of the samples and loosely focusing laser light on the surface, it was found that the micromachining throughput is increased by up to 10-fold as compared with micromachining without the water layer (conventional focusing in air), however, the main reasons for the increase in fabrication efficiency have not been fully understood until now. By modelling the propagation of the femtosecond pulses by means of the nonlinear modified Schrodinger equation through the water layer, we show that the increased throughput is attributed to the changing of the Gaussian intensity profile. In addition, we confirm these findings by numerically modelling the ablated crater formation.

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An investigation on 800 nm femtosecond laser ablation of K9 glass in air and vacuum

Cited by 27 publications

References 34 publications

Spontaneous periodic ordering on the surface and in the bulk of dielectrics irradiated by ultrafast laser: a shared electromagnetic origin

Spontaneous periodic ordering on the surface and in the bulk of dielectrics irradiated by ultrafast laser: a shared electromagnetic origin

Controllable preparation of microtips array on (100) crystal plane of single‐crystal lanthanum hexaboride ceramic

Femtosecond Beam Transformation Effects in Water, Enabling Increased Throughput Micromachining in Transparent Materials

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