Posted on May 17, 2018February 9, 2020 by patrickPulse Compressor Here’s the layout of the pulse compressor. It consists of both grating and prism stages. Two stage pulse compressor, using diffraction grating and prism sections. The laser pulses from the NOPA output are highly chirped with a duration of 400 fs or more. This compensates for the chirp, producing pulses of 20 fs or less.