Observation of inner surface roughness in fused silica microholes with varying the number of femtosecond laser pulses

2017 ◽  
Author(s):  
Masahiko Shiraishi ◽  
Kazuhiro Watanabe ◽  
Shoichi Kubodera
Keyword(s):  
Surface Roughness ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Inner Surface

High power supercontinuum generation by dual-color femtosecond laser pulses in fused silica

2021 ◽  
Author(s):  
Saba Zafar ◽  
Dong-Wei Li ◽  
Acner Camino ◽  
Jun-Wei Chang ◽  
Zuo-Qiang Hao
Keyword(s):  
Femtosecond Laser ◽  
High Power ◽  
Microlens Array ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Spectral Energy ◽  
Phase Matching ◽  
Fundamental Wavelength ◽  
Fundamental Laser

Abstract High power supercontinuum (SC) is generated by focusing 800 nm and 400 nm femtosecond laser pulses in fused silica with a microlens array. It is found that the spectrum of the SC is getting broader compared with the case of single laser pulse, and the spectral energy density between the two fundamental laser wavelengths is getting significantly higher by optimizing the phase matching angle of the BBO. It exceeds μJ/nm over 490 nm range which is from 380 nm to 870 nm, overcoming the disadvantage of relative lower power in the ranges far from fundamental wavelength.

Transient reflectivity and transmission changes during plasma formation and ablation in fused silica induced by femtosecond laser pulses

2008 ◽  
Vol 92 (4) ◽  
pp. 803-808 ◽  
Author(s):  
D. Puerto ◽  
W. Gawelda ◽  
J. Siegel ◽  
J. Bonse ◽  
G. Bachelier ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Plasma Formation

Enhanced formation of nanogratings inside fused silica due to the generation of self-trapped excitons induced by femtosecond laser pulses

2012 ◽  
Author(s):  
Sören Richter ◽  
Fei Jia ◽  
Matthias Heinrich ◽  
Sven Döring ◽  
Stefan Nolte ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica

scholarly journals Time-resolved shadowgraphs of transient plasma induced by spatiotemporally focused femtosecond laser pulses in fused silica glass

2015 ◽  
Vol 40 (24) ◽  
pp. 5726 ◽  
Author(s):  
Zhaohui Wang ◽  
Bin Zeng ◽  
Guihua Li ◽  
Hongqiang Xie ◽  
Wei Chu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Silica Glass ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Time Resolved ◽  
Transient Plasma ◽  
Fused Silica Glass

Characterization of Electrical Contacts on Silicon (100) after Ablation and Sulfur Doping by Femtosecond Laser Pulses

2013 ◽  
Vol 205-206 ◽  
pp. 358-363 ◽  
Author(s):  
Philipp Saring ◽  
Anna Lena Baumann ◽  
Stefan Kontermann ◽  
Wolfgang Schade ◽  
Michael Seibt
Keyword(s):  
Surface Roughness ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Sample Surface ◽  
Femtosecond Laser Pulses ◽  
Electrical Contacts ◽  
Single Shot ◽  
Excess Charge ◽  
Silicon Sample ◽  
Etching Depth

This paper investigates the influence of different number of laser pulses on contact behavior and conductivity of the surface layer of femtosecond laser microstructured, sulfur-doped silicon. Single shot laser processed silicon (Pink Silicon) is characterized by low surface roughness, whereas five shot laser processed silicon (Grey Silicon) has an elevated sulfur content with a surface roughness low enough to maintain good contacting. To laterally confine the laser induced pn-junction part of the Grey Silicon sample surface is etched off. The etching depth is confirmed to be sufficient to completely remove the active n-type sulfur layer. While Pink Silicon shows little or no lateral conductivity within the laser processed layer, Grey Silicon offers acceptable conductivity, just as expected by the fact of having incorporated a higher sulfur dopant content. Recombination dominates the irradiated regions of Pink Silicon and suppresses excess charge carrier collection. Grey Silicon, while showing sufficient lateral conductivity, still shows regions of lower conductivity, most likely dominated by the laser irradiation-induced formation of dislocations. According to our results, the optimum laser pulse number for electrical and structural properties is expected to be in the range between one and five laser pulses.

Inscription of high contrast volume Bragg gratings in fused silica with femtosecond laser pulses

2010 ◽  
Vol 102 (1) ◽  
pp. 35-38 ◽  
Author(s):  
Christian Voigtländer ◽  
Daniel Richter ◽  
Jens Thomas ◽  
Andreas Tünnermann ◽  
Stefan Nolte
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Bragg Gratings ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
High Contrast ◽  
Volume Bragg Gratings ◽  
Contrast Volume

scholarly journals Micromachining of Transparent Biocompatible Polymers Applied in Medicine Using Bursts of Femtosecond Laser Pulses

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1093
Author(s):  
Evaldas Kažukauskas ◽  
Simas Butkus ◽  
Piotr Tokarski ◽  
Vytautas Jukna ◽  
Martynas Barkauskas ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Femtosecond Laser ◽  
Contact Lenses ◽  
Laser Pulses ◽  
Laser Micromachining ◽  
Femtosecond Laser Pulses ◽  
Intraocular Lenses ◽  
Great Promise ◽  
Biocompatible Polymers ◽  
Mechanical Methods

Biocompatible polymers are used for many different purposes (catheters, artificial heart components, dentistry products, etc.). An important field for biocompatible polymers is the production of vision implants known as intraocular lenses or custom-shape contact lenses. Typically, curved surfaces are manufactured by mechanical means such as milling, turning or lathe cutting. The 2.5 D objects/surfaces can also be manufactured by means of laser micromachining; however, due to the nature of light–matter interaction, it is difficult to produce a surface finish with surface roughness values lower than ~1 µm Ra. Therefore, laser micromachining alone can’t produce the final parts with optical-grade quality. Laser machined surfaces may be polished via mechanical methods; however, the process may take up to several days, which makes the production of implants economically challenging. The aim of this study is the investigation of the polishing capabilities of rough (~1 µm Ra) hydrophilic acrylic surfaces using bursts of femtosecond laser pulses. By changing different laser parameters, it was possible to find a regime where the surface roughness can be minimized to 18 nm Ra, while the polishing of the entire part takes a matter of seconds. The produced surface demonstrates a transparent appearance and the process shows great promise towards commercial fabrication of low surface roughness custom-shape optics.

Efficient VBG in fused silica induced by femtosecond laser pulses

2010 ◽  
Author(s):  
Christian Voigtländer ◽  
Daniel Richter ◽  
Jens Thomas ◽  
Stefan Nolte ◽  
Andreas Tünnermann
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica
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