We report a method for filtering out the noises produced in optical parametric chirped-pulse amplifiers by dressing the seed beam with spatial chirp. After dechirping the amplified signal with a compressor, the noises experience a spatiotemporal coupling, making themselves highly distinguishable from the compressed signal in space, and hence supporting noise filtering effectively and expediently in the spatial domain, which would otherwise not be possible. Numerical simulations performed for the proposed method show the capabilities of an order of magnitude reduction in the noise energy and several orders of magnitude enhancement in the temporal contrast.
© 2014 Optical Society of America
Original Manuscript: January 22, 2014
Revised Manuscript: March 12, 2014
Manuscript Accepted: March 14, 2014
Published: April 11, 2014
Jing Wang, Jingui Ma, Yongzhi Wang, Peng Yuan, Guoqiang Xie, and Liejia Qian, "Noise filtering in parametric amplification by dressing the seed beam with spatial chirp," Opt. Lett. 39, 2439-2442 (2014)