Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation

Chen Lin; Yan Chen; Xiaoyang Li; Lei Yang; Rui Ni; Gang Zhao; Yong Zhang; Xiaopeng Hu; Shining Zhu

doi:10.3788/COL202018.071902

Chinese Optics Letters, Volume. 18, Issue 7, 071902(2020)

Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation

Chen Lin, Yan Chen, Xiaoyang Li, Lei Yang, Rui Ni, Gang Zhao^*, Yong Zhang, Xiaopeng Hu^**, and Shining Zhu

National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and School of Physics, Nanjing University, Nanjing 210093, China

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Fig. 1. (a) Schematic of the phase-matching diagram for emitting vortex beams with doubled frequency; the orange arrow represents the polarization direction of the FW and the SH wave. (b) Cross section of the ${LiNbO}_{3}$ micro-ring resonator. (c) Illustration of the polar coordinate system and the emitted SH vortex beam with a helical phase front.

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Fig. 2. Simulated (a) intensity distribution and (b) phase of the emitted SH wave excited by TM polarized FW. The TC of the SH vortex beam is $l = 40$ .

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Fig. 3. Simulated intensity distributions of different components (a) $E_{ρ}$ , (b) $E_{φ}$ , and (c) $E_{ζ}$ , with $l = 40$ .

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Table 1. Cherenkov Radiation Angle, Topological Charge, and Conversion Efficiency Varying with the Poling Period
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Table 1. Cherenkov Radiation Angle, Topological Charge, and Conversion Efficiency Varying with the Poling Period
Poling Period (nm) 500 390 330
Radiation angle ( $θ_{c}$ ) 45° 60° 70°
Topological charge ( $l$ ) 976 674 444
Conversion efficiency $4.11 \times 10^{- 4}$ $1.68 \times 10^{- 4}$ $2.02 \times 10^{- 5}$

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Chen Lin, Yan Chen, Xiaoyang Li, Lei Yang, Rui Ni, Gang Zhao, Yong Zhang, Xiaopeng Hu, Shining Zhu, "Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation," Chin. Opt. Lett. 18, 071902 (2020)

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