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Degenerate optical parametric amplifier delivering sub 30 fs pulses with 2GW peak power

: Hädrich, S.; Rothhardt, J.; Röser, F.; Gottschall, T.; Limpert, J.; Tünnermann, A.

Postprint (986 KByte; PDF; )

Optics Express 16 (2008), Nr.24, S.19812-19820
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
repetition rate; fiber laser; amplification system; bandwidth; KHZ

Degenerated optical parametric amplification (OPA) is a well known technique to achieve broadband amplification necessary to generate ultrashort pulses. Here we present a parametric amplifier pumped by the frequency doubled output of a state-of-the-art fiber chirped pulse amplification system (FCPA) delivering mJ pulse energy at 30 kHz repetition rate and 650 fs pulse duration. The parametric amplifier and the FCPA system are both seeded by the same Yb:KGW oscillator. Additional spectral broadening of the OPA seed provides enough bandwidth for the generation of ultrashort pulses. After amplification in two 1 mm BBO crystals a pulse energy of 90 mu J is yielded at 30 kHz. Subsequent compression with a sequence of chirped mirrors shortens the pulses to 29 fs while the pulse energy is as high as 81 mu J resulting in 2 GW of peak power.