Abstract
We present a technique for efficient generation of the second-harmonic signal at several points of a nonlinear crystal simultaneously. Multispot operation is performed by using a diffractive optical element that splits the near-infrared light of a mode-locked Ti:sapphire laser into an arbitrary array of beams that are transformed into an array of foci at the nonlinear crystal. We show that, for pulse temporal durations under 100 fs, spatiotemporal shaping of the pulse is mandatory to overcome chromatic dispersion effects that spread both in space and time the foci showing a reduced peak intensity that prevents nonlinear phenomena. We experimentally demonstrate arbitrary irradiance patterns for the second-harmonic signal consisting of more than 100 spots with a multipass amplifier delivering 28 fs, 0.8 mJ pulses at 1 kHz repetition rate.
©2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Wenqi Lei, Jian Wu, Hua Cai, and Heping Zeng
Opt. Lett. 34(2) 166-168 (2009)
Guihua Li, Jielei Ni, Hongqiang Xie, Bin Zeng, Jinping Yao, Wei Chu, Haisu Zhang, Chenrui Jing, Fei He, Huailiang Xu, Ya Cheng, and Zhizhan Xu
Opt. Lett. 39(4) 961-964 (2014)
Jorge Pérez-Vizcaíno, Omel Mendoza-Yero, Gladys Mínguez-Vega, Raúl Martínez-Cuenca, Pedro Andrés, and Jesús Lancis
Opt. Lett. 38(4) 440-442 (2013)