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Hibridni laser z ultrakratkimi bliski za visoko natančne obdelave v industriji
Černe, Luka (Author), Petkovšek, Rok (Mentor) More about this mentor... This link opens in a new window

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Abstract
V tem doktorskem delu je predstavljen hibridni laser za visoko natančne obdelave v industriji, ki omogoča delovanje v načinu bliskov na zahtevo. Za visoko natančne obdelave potrebujemo laserski sistem z ultrakratkimi bliski, ki pa mora biti za doseganje velikih obdelovalnih hitrosti združljiv tudi s poligonskimi oz. resonančnimi skenirnimi sistemi. Zaradi uporabe v industrijskem okolju mora biti tak sistem tudi čim bolj kompakten. Težavo pri takem laserju predstavljajo predvsem nelinearni optični pojavi, ki vplivajo tako na časovno kot na spektralno obliko bliskov. Da bi zmanjšali njihov vpliv in hkrati zagotovili kompaktnost sistema, smo raziskali hibridni laser, ki temelji na kombinaciji vlakenskega in trdninskega ojačevalnika v MOPA postavitvi in uporablja t. i. CPA metodo za ojačenje ultrakratkih bliskov. Zaradi kombinacije vlakenskega in trdninskega ojačevalnika pri takem sistemu naletimo na dodatne težave pri tvorbi bliskov na zahtevo. Te smo rešili s kontrolo valovne dolžine jalovih bliskov, s katerimi nadziramo obrnjeno zasedenost oz. ojačenje pri tvorbi bliskov na zahtevo. Z uporabo omenjenih metod nam je tako v sklopu doktorske naloge uspelo raziskati hibridni laser, ki lahko deluje v načinu bliskov na zahtevo in lahko generira ultrakratke laserske bliske s časom trajanja 500 fs ter največjo energijo 300 µJ.

Language:Slovenian
Keywords:vlakenski laserji, ultrakratki bliski, hibridni laserji, bliski na zahtevo
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Publisher:[L. Černe]
Number of pages:XXX, 112 str.
UDC:535.374:621.375.826(043.3)
COBISS.SI-ID:30267139 This link opens in a new window
Views:156
Downloads:56
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Secondary language

Language:English
Title:Ultrashort pulsed hybrid laser for high precision industrial processing
Abstract:
This thesis presents a hybrid laser with pulse on demand operation for high precision industrial processing. For high precision materials processing the laser system must produce ultrashort laser pulses and needs to be compatible with polygon or resonant scanners in order to achieve high processing speeds. Additionally, a compact system is required in order to be used in an industrial environment. Nonlinear optical phenomena are the main cause of problems in such system, as they influence both temporal and spectral pulse shape. To reduce their influence and in the same time ensure a compact design, a hybrid laser was investigated. It is based on a combination of a fiber and solid state amplifier in a MOPA configuration and uses a so called CPA method for ultrashort pulse amplification. Such systems exhibit additional problems when producing pulses on demand, due to the combination of a fiber and a solid-state amplifier. We solved this problem with wavelength control of the idler pulses, which are used for gain control in pulse on demand operation. Using the above methods, a hybrid laser capable of pulse on demand operation that can generate ultrashort laser pulses with 500 fs pulse duration and 300 µJ pulse energy, was developed.

Keywords:fiber lasers, ultrashort laser pulses, hybrid lasers, pulses on demand

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