Optical switching and contrast enhancement in intense laser systems by cascaded optical parametric amplification.
Optical parametric chirped-pulse amplification (OPCPA) can be used to improve the prepulse contrast in chirped-pulse amplification systems by amplifying the main pulse with a total saturated OPCPA gain, while not affecting the preceding prepulses of the seed oscillator mode-locked pulse train. We show that a simple modification of a multistage OPCPA system into a cascaded optical parametric amplifier (COPA) results in an optical switch and extreme contrast enhancement that can completely eliminate the preceding and trailing oscillator pulses. Instrument-limited measurement of a prepulse contrast ratio of 1.4 x 10(11) is demonstrated from COPA at a 30 mJ level.
Lawrence Livermore National Laboratory, Mail Code L-470, 7000 East Avenue, Livermore, California 94550, USA. jovanovicl@llnl.gov
Igor
I
Jovanovic
C P J
CP
Barty
Constantin
C
Haefner
Benoit
B
Wattellier