title: Generation of light with controllable spatial patterns via the sum frequency in quasi-phase matching crystals.
abstract: Light beams with extraordinary spatial structures, such as the Airy beam (AB), the Bessel-Gaussian beam (BGB) and the Laguerre-Gaussian beam (LGB), are widely studied and applied in many optical scenarios. We report on preparation of light beams with controllable spatial structures through sum frequency generation (SFG) using two Gaussian pump beams in a quasi-phase matching (QPM) crystal. The spatial structures, including multi-ring-like BGB, donut-like LGB, and super-Gaussian-like beams, can be controlled periodically via crystal phase mismatching by tuning the pump frequency or crystal temperature. This phenomenon has not been reported or discussed previously. Additionally, we present numerical simulations of the phenomenon, which agree very well with the experimental observations. Our findings give further insight into the SFG process in QPM crystals, provide a new way to generate light with unusual spatial structures, and may find applications in the fields of laser optics, all-optical switching, and optical manipulation and trapping.
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [3].
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Zhou
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China [3].
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Ding
authors.affiliation: College of Physics and Information Engineering, Fuzhou University, Fuzhou 350002, China.
authors.forename: Yun-Kun
authors.initials: YK
authors.lastname: Jiang
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Shi
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Bao-Sen
authors.initials: BS
authors.lastname: Shi
authors.affiliation: 1] Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China [2] Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo