Extreme prepulse contrast utilizing cascaded-optical parametric amplification Page: 4 of 4
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We have experimentally shown that the COPA technique indeed allows extreme
prepulse contrast enhancement. In principle, infinite contrast enhancement is possible by the
COPA technique and is only limited by the pump pulse time duration. Within this window the
COPA contrast is limited by the usual parametric fluorescence. Simple modification of a multi-
stage OPCPA system results in its operation in a COPA mode, particularly for systems operating
near degeneracy. Since the COPA technique does not rely on the nonlinear effects on the pulse
itself, it is extraordinarily versatile. COPA can be operated at any energy level, with either
stretched or compressed pulses. A particularly attractive implementation of the scheme is to
operate in conjunction with quasi-phase-matched OPA, (Fig. 2) where a simple low-energy
contrast enhancement can be accomplished utilizing a single OPA crystal.
This work was performed under the auspices of the U.S Department of Energy by the University of
California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.
101 -20 -10 0 10 20
Fig. 1: (thin line) OPCPA amplifies an isolated oscillator pulse, but does not remove prepulses; (thick line)
COPA removes all oscillator prepulses. The COPA pulse is shifted by 1 ns for better distinction.
short pulse stretched
. 2. pulse
Fig. 2. Schematic for millijoule OPCPA/COPA in PPKTP. D - dichroic beamsplitter, Selection between
OPCPA and COPA is accomplished by reflecting the idler instead of the signal into the second
 Wattellier, B., I. Jovanovic, and C.P.J. Bary. "Cascaded-optical parametric amplification for extreme contrast enhancement". in
Conference on Lasers and Electro-Optics (CLEO). 2003. Baltimore, MD, U SA
 Jovanovic, I., C. Haefner, B. Wattellier, and C.P.J. Barty,"Optical switching and contrast enhancement in intense laser systems by
cascaded optical parametric amplification," Opti. Lett..31, 787 (2006).
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Jovanovic, I; Haefner, C; Wattellier, B & Barty, C J. Extreme prepulse contrast utilizing cascaded-optical parametric amplification, article, June 15, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886906/m1/4/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.