Pulse-on-demand laser operation from nanosecond to femtosecond pulses and its application for high-speed processing

Petelin, Jaka (author), Černe, Luka (author), Mur, Jaka (author), Agrež, Vid (author), Kočica, Jernej Jan (author), Schille, Jörg (author), Loeschner, Udo (author), Petkovšek, Rok (author)

In this manuscript we present a true pulse-on-demand laser design concept using two different approaches. First, we present a fiber master oscillator power amplifier (MOPA) based quasi-continuous wave (CW) laser, working at high modulation bandwidths, for generation of nanosecond pulses. Second, we present a hybrid chirped pulse amplification (CPA)-based laser, combining a chirped-pulse fiber amplifier and an additional solid-state amplifier, for generation of femtosecond pulses. The pulse-on-demand operation is achieved without an external optical modulator/shutter at high-average powers and flexible repetition rates up to 40 MHz, using two variants of the approach for near-constant gain in the amplifier chain. The idler and marker seed sources are combined in the amplifier stages and separated at the out using either wavelength-based separation or second harmonic generation (SHG)-generation-based separation. The nanosecond laser source is further applied to high throughput processing of thin film materials. The laser is combined with a resonant scanner, using the intrinsic pulse-on-demand operation to compensate the scanner%s sinusoidal movement. We applied the setup to processing of indium tin oxide (ITO) and metallic films on flexible substrates.

• Language: English
• Keywords: arbitrary repetition rate, fiber lasers, gain control, high speed processing, pulse-on-demand
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Publication date: 14.07.2021
• Year: 2021
• Number of pages: 10 str.
• Numbering: Vol. 10, iss. 4/5
• PID: 20.500.12556/RUL-138101
• UDC: 621.7.015:621.375.826
• ISSN on article: 2192-8576
• DOI: 10.1515/aot-2021-0020
• COBISS.SI-ID: 74192131
• Publication date in RUL: 11.07.2022

Record is a part of a journal

• Title: Advanced optical technologies
• Publisher: de Gruyter
• ISSN: 2192-8576
• COBISS.SI-ID: 522770201

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.07.2021

Secondary language

• Language: Slovenian
• Keywords: poljubna ponavljalna frekvenca, vlakenski laserji, kontrola ojačenja, hitro procesiranje, blisk na zahtevo

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0270
• Name: Proizvodni sistemi, laserske tehnologije in spajanje materialov

• Funder: ARRS - Slovenian Research Agency
• Project number: L2-9240
• Name: Ultrakratki laserski pulzi na zahtevo