We used elliptical beams to demonstrate aperture scaling effects in nanosecond single-grating and multigrating periodically poled lithium niobate (PPLN) monolithic optical parametric oscillators and generators. Increasing the cavity Fresnel number in single-grating crystals broadened both the beam divergence and the spectral bandwidth. Both effects are explained in terms of the phase-matching geometry. These effects are suppressed when a multigrating PPLN crystal is used because the individual gratings provide small effective subapertures. A flood-pumped multigrating optical parametric generator displayed a low output beam divergence and contained 19 pairs of signal and idler frequencies.
© 2000 Optical Society of AmericaFull Article | PDF Article
Robert G. Wenzel and George P. Arnold
Appl. Opt. 15(5) 1322-1326 (1976)
Mark J. Missey, Vince Dominic, Peter E. Powers, and Kenneth L. Schepler
Opt. Lett. 24(17) 1227-1229 (1999)
M. Vaidyanathan, R. C. Eckardt, Vince Dominic, L. E. Myers, and T. P. Grayson
Opt. Express 1(2) 49-53 (1997)