Chirped quasi-phase-matched (QPM) gratings offer essentially constant gain over wide bandwidths, making them promising candidates for short-pulse optical parametric amplifiers. However, we discovered that high-gain noncollinear processes can compete with the desired broadband gain of such amplifiers. Here, we investigate these noncollinear gain-guided modes both numerically and analytically, including longitudinal nonuniformity of the phase-matching profile, lateral localization of the pump beam, and the noncollinear propagation of the interacting waves.
© 2010 Optical Society of America
Original Manuscript: October 19, 2009
Manuscript Accepted: December 20, 2009
Published: March 31, 2010
Mathieu Charbonneau-Lefort, Bedros Afeyan, and M. M. Fejer, "Theory and simulation of gain-guided noncollinear modes in chirped quasi-phase-matched optical parametric amplifiers," J. Opt. Soc. Am. B 27, 824-841 (2010)