Razvoj lasersko povzročenih periodičnih površinskih struktur na površini titana pri obsevanju s pikosekundnimi laserskimi bliski

Matej Senegačnik (Author), Matej Hočevar (Author), Peter Gregorčič (Author)

Abstract

Z lasersko povzročenimi periodičnimi površinskimi strukturami (LIPSS) je mogoče pomembno izboljšati funkcionalnost površin. V eksperimentih smo titan obdelovali z linearno polariziranimi pikosekundnimi laserskimi bliski z valovno dolžino [gama] = 1064 nm. Preučevali smo nastanek, obliko in razvoj LIPSS v odvisnosti od celokupnega števila bliskov, ki so obsevali površino. Rezultati kažejo, da pri majhnem številu bliskov na nastanek in orientacijo LIPSS vplivajo predhodne poškodbe površine. Pokazali smo, da pri večjih fluencah v osrednjem delu obdelovanega območja nastanejo LIPSS z nizko prostorsko fluenco (LSFL). Perioda struktur je znašala 0,8 [gama] - 1 [gama], orientacija pa je bila pravokotna na polarizacijo svetlobe. Nasprotno so na robu območja laserske pike, kjer je fluenca nižja od mejne fluence za ablacijo, po obsevanju s posameznim bliskom nastale LIPSS z visoko prostorsko fluenco (HSFL); njihova perioda je znašala 0,15 [gama] - 0,5 [gama], orientacija pa je bila lahko pravokotna ali vzporedna s polarizacijo svetlobe. Meritve kažejo, da se perioda LSFL s številom bliskov manjša; po obdelavi s petstotimi bliski se je zmanjšala za 20%.

Keywords

inženiring površin;lasersko mikrostrukturiranje;laserska obdelava;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	1.03 - Short Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	621.9(045)
COBISS:	16208667
ISSN:	1855-6493
Views:	639
Downloads:	106
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Formation of laser-induced periodic surface structures on titanium surface due to irradiation by picosecond-laser pulses
Secondary abstract:	Laser-induced periodic surface structures (LIPSS) can significantly improve the surface functionality. In the experiments, we irradiated titanium surfaces by linearly polarized picosecond-laser pulses with a wavelength of [gama] =1064 nm. We studied the formation and growth of LIPSS with increasing the number of pulses irradiating the surface. Results show, that existing defects on the non-treated surface affect the LIPSS formation and orientation. We have shown that higher fluences in the center of the laser spot lead to formation of low spatial frequency LIPSS (LSFL) with period 0.8 [gama] - 1 [gama], and orientation perpendicular to light polarization. On the contrary, at the edge of the laser spot, where fluence is below the single-pulse ablation threshold, high spatial frequency LIPSS (HSFL) appear with period 0.15 [gama] - 0.5 [gama] and orientation perpendicular or parallel to pulse polarization. Measurements reveal that the LSFL period decreases with number of pulses and is about 20% smaller when five hundred pulses have irradiated the surface.
Secondary keywords:	surface engineering;laser microstructuring;laser processing;
Pages:	str. 15-21
Volume:	ǂLetn. ǂ6
Issue:	ǂšt. ǂ5/6
Chronology:	dec. 2017
ID:	10958501