Abstract

We report a new, to the best of our knowledge, approach to phase matching of nonlinear materials based on the free-space multipass cells. This technique is applicable to noncentrosymmetric nonlinear crystals, including crystals that cannot be birefringent phase-matched or quasi-phase matched by periodic poling. Notably, by using this approach, the crystalline quartz is quasi-phase matched with the demonstrated increase of the second harmonic generation efficiency by a factor of 40. The method can be extended toward UV and THz ranges. This promises to revolutionize experimental nonlinear optics and all applications by increasing the number of available crystals for quasi-phase matching by at least one order of magnitude and brings fresh motivation for developing novel nonlinear materials.

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Efficient first-order quasi-phase-matched backward second-harmonic generation

Patrick Mutter, Kjell Martin Mølster, Andrius Zukauskas, Valdas Pasiskevicius, and Carlota Canalias
Opt. Lett. 48(6) 1534-1537 (2023)

Generation of coherent radiation in the vacuum ultraviolet using randomly quasi-phase-matched strontium tetraborate

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Intra-pulse difference-frequency generation of mid-infrared (2.7–20  μm) by random quasi-phase-matching

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Phase-mismatched optical parametric oscillators based on aperiodic quasi-phase-matched crystals

Songyin Yu, Mengke Qin, and Zhaowei Zhang
Opt. Lett. 48(21) 5483-5486 (2023)

Validation of the angular quasi-phase-matching theory for the biaxial optical class using PPRKTP

Dazhi Lu, Alexandra Peña, Patricia Segonds, Jérôme Debray, Simon Joly, Andrius Zukauskas, Fredrik Laurell, Valdas Pasiskevicius, Haohai Yu, Huaijin Zhang, Jiyang Wang, Carlota Canalias, and Benoît Boulanger
Opt. Lett. 43(17) 4276-4279 (2018)