Laserska obdelava površin z UV ultrakratkimi bliski

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Matic Kovačič (Author), Peter Gregorčič (Mentor)

Abstract

V magistrski nalogi smo obravnavali lasersko obdelavo vzorcev iz nerjavnega jekla in stekla. Uporabili smo laser z ultrakratkimi bliski z valovno dolžino 343 nm, frekvenco med nizi bliskov 333 kHz, frekvenco bliskov v nizu 40 MHz in časom trajanja bliskov 300 fs. Pri nerjavnem jeklu debelin 25 µm in 50 µm smo se osredotočili na vpliv obdelovalnih parametrov na učinkovitost laserske ablacije, pri vzorcih iz stekla pa smo se osredotočili na vpliv obdelovalnih parametrov na obliko in velikost izvrtine ter vpliv na iluminacijo obdelane površine, pri čemer smo si pomagali z optičnim mikroskopom, vrstičnim elektronskim mikroskopom (SEM) in optičnim profilomerom. Zasnovali smo eksperimentalni sistem z ultrakratkimi laserskimi bliski, pri čemer smo v sistem vključili tudi elemente, ki smo jih izoblikovali in nato natisnili s 3D tiskalnikom. Iz rezultatov raziskave z vzorci iz nerjavnega jekla smo razbrali, da je učinkovitost laserske ablacije večja pri tanjšem materialu, večji velikosti snopa v gorišču in manjšem številu bliskov v nizu. Na vzorcih iz stekla smo pokazali povečevanje velikosti izvrtin pri višji povprečni laserski moči in večjem številu bliskov. Ugotovili smo, da ima vzorec iz stekla, ki smo ga obdelali pri višji povprečni laserski moči in večjem številu bliskov, tudi boljšo prečno iluminacijo in večjo možnost za nastanek srha na vhodu v izvrtino.

Keywords

magistrske naloge;laser;ultrakratki bliski;niz bliskov;laserska obdelava;nerjavno jeklo;steklo;

Data

Language:	Slovenian
Year of publishing:	2025
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[T. Ambrožič]
UDC:	544.537:621.375.826(043.2)
COBISS:	227228419
Views:	35
Downloads:	5
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Laser processing of surfaces with UV ultrashort pulses
Secondary abstract:	In the master's thesis we addressed the laser processing of stainless steel and glass samples. We used a laser with ultrashort pulses with a wavelength of 343 nm, pulse repetition rate of 333 kHz, intra-burst repetition rate of 40 MHz and pulse duration of 300 fs. With the stainless steel samples with thickness of 25 μm and 50 μm we focused on the effects of the processing parameters on the laser ablation efficiency; meanwhile with the glass samples we focused on the effects of the processing parameters on the shape and size of the hole as well as on the effects on the illumination of the processed surface where we also used an optical microscope, a scanning electron microscope (SEM) and an optical profilometer. We designed the experimental system with ultrashort laser pulses, whereas in the system we also included elements which we modeled and later printed with a 3D printer. Based on the results of the research of stainless steel samples we have concluded that the laser ablation efficiency is higher at thinner material, larger beam spot size in the focal point and lower number of pulses in a burst. We have shown the increase of the hole size on the glass samples at higher average laser power and higher number of pulses. We found out that a glass sample which we processed at a higher average laser power and higher number of pulses also has better cross illumination and a higher chance of developing needle-shaped structures at the entrance of the hole.
Secondary keywords:	master thesis;laser;ultrashort pulses;burst of pulses;laser processing;stainless steel;glass;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XX, 62 str.
ID:	25955980