Efficient generation of 200mJ nanosecond pulses at 100Hz repetition rate from a cryogenic cooled Yb:YAG MOPA system
2009; Elsevier BV; Volume: 282; Issue: 11 Linguagem: Inglês
10.1016/j.optcom.2009.02.051
ISSN1873-0310
AutoresS. J. Pearce, Ryo Yasuhara, Akira Yoshida, Junji Kawanaka, Toshiyuki Kawashima, Hirofumi Kan,
Tópico(s)Laser-Matter Interactions and Applications
ResumoA diode-pumped Master Oscillator Power Amplifier (MOPA) laser system based on cryogenic cooled Yb:YAG has been designed, developed and its output performance characterised. The laser system consists of a fibre oscillator, an active mirror regenerative amplifier and a four pass main amplifier. 2.4 mJ, 10 ns, 100 Hz seed pulses from the fibre oscillator/regenerative amplifier arrangement were amplified up to pulse energies of over 200 mJ by using the four pass main amplifier arrangement. As a further study we have obtained an increased slope efficiency of 40% and an optical-to-optical efficiency of 30% using a pinhole vacuum spatial filter/image relay for laser mode control. With 1.8 mJ input seed pulses, output pulse energies of around 150 mJ were achieved.
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