To provide high-energy, high-power beams at short wavelengths for inertial-confinement fusion experiments, we routinely convert the 1.05-μm output of the Nova, Nd:phosphate-glass, laser system to its second- or third-harmonic wavelength. We describe the design and performance of the 3 × 3 arrays of potassium dihydrogen phosphate crystal plates used for type-II–type-II phase-matched harmonic conversion of the Nova 0.74-m diameter beams. We also describe an alternate type-I–type-II phase-matching configuration that improves third-harmonic conversion efficiency. These arrays provide conversion of a Nova beam of up to 75% to the second harmonic and of up to 70% to the third harmonic.
© 1992 Optical Society of America
Original Manuscript: April 1, 1991
Published: October 20, 1992
P. J. Wegner, M. A. Henesian, D. R. Speck, C. Bibeau, R. B. Ehrlich, C. W. Laumann, J. K. Lawson, and T. L. Weiland, "Harmonic conversion of large-aperture 1.05-μm laser beams for inertial-confinement fusion research," Appl. Opt. 31, 6414-6426 (1992)