| Abstract [eng] |
Single-pass and double-pass pre-chip managed (PCMA) fiber amplifier systems were designed and constructed for amplification of femtosecond pulses from Yb:KGW oscillator „Flint“. Spatial, temporal and power characteristics of amplified light was measured. A PCMA fiber amplifier was demonstrated for the first time, in which pulse pre-chirping and pulse compression is done using Gires – Tournois interferometric (GTI) mirror pairs. Such a combination of GTI’s and PCMA allowed to achieve 75 fs almost transform limited amplified pulses with average power of 19 W. Moreover, the use of GTI mirrors in the PCMA system is attractive due to its easy adjustment, high energy efficiency (>93%) and compactness. Also, the features of PCMA nonlinear amplification method were determined – broadened spectrum of amplified pulses due to self-phase modulation and optimal pre-chirping group delay dispersion at which the highest quality shortest pulses were determined. In addition, a double-pass PCMA amplification system has been demonstrated for the first time, which not only retains the advantages of the single-pass PCMA method but has an even higher gain and efficiency. Such a PCMA amplifier will be used as a high power and high pulse quality laser system for further nonlinear optics experiments. |
