Divided-pulse amplification is a promising method for the energy scaling of femtosecond laser amplifiers, where pulses are temporally split prior to amplification and coherently recombined afterwards. We present a method that uses an actively stabilized setup with separated stages for splitting and combining. The additional degrees of freedom can be employed to mitigate the limitations originating from saturation of the amplifier that cannot be compensated in passive double-pass configurations using just one common stage for pulse splitting and combining. In a first proof-of-principle experiment, actively controlled divided pulses are applied in a fiber chirped-pulse amplification system resulting in combined and compressed pulses with an energy of 1.25 mJ and a peak power of 2.9 GW.
© 2014 Optical Society of America
Lasers and Laser Optics
Original Manuscript: December 5, 2013
Manuscript Accepted: January 3, 2014
Published: February 13, 2014
Marco Kienel, Arno Klenke, Tino Eidam, Steffen Hädrich, Jens Limpert, and Andreas Tünnermann, "Energy scaling of femtosecond amplifiers using actively controlled divided-pulse amplification," Opt. Lett. 39, 1049-1052 (2014)