Femtosecond laser system based on thin rod active Yb : YAG elements with high average output power and pulse energy. (October 2021)

• Record Type: Journal Article
• Authors: Yang, J.; Kim, J.W.; Sall, E.G.; Lee, B.; Jeong, B.; Park, S.; Kim, C.; Yashin, V.E.; Kim, G.H.
• Is Part Of: Quantum electronics. Volume 51:Number 10(2021)
• Page Start: 873
• Page End: 877
• Publication Date: 2021-10
• Subjects: laser Yb : YAG rod amplifiers -- diode pumping -- high average power and output energy -- femtosecond pulses; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL17622
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: A three-stage laser amplifier system based on thin Yb : YAG rods with laser diode pumping has been developed and manufactured. A continuous train of femtosecond pulses from an Yb : KGW master oscillator with a repetition rate of 80 MHz and an initial duration of 150 fs is controlled by a Pockels cell to a frequency of 0.25−1 MHz and is amplified in the system by more than 6500 times to an average power of over 100 W. To suppress self-focusing, the pulses are lengthened in a stretcher on a volume Bragg diffraction grating, amplified, and then compressed to 947 fs. The energy of femtosecond pulses compressed after amplification exceeds 100−170 μJ at different repetition rates, which makes it possible to use them for efficient micromachining of various materials.