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:doi:10.3788/COL202018.071902

Chinese Optics Letters, 2020, 18 (7): 071902, Published Online: Jun. 15, 2020

Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation Download： 741次

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

Author Affiliations

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

Figures & Tables

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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Table1. 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[J]. Chinese Optics Letters, 2020, 18(7): 071902.

Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation Download： 741次

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 $l = 40$ .

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

Table1. Cherenkov Radiation Angle, Topological Charge, and Conversion Efficiency Varying with the Poling Period

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Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation Download： 741次

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.

Fig. 3. Simulated intensity distributions of different components (a) Eρ, (b) Eφ, and (c) Eζ, with l=40.

Table1. Cherenkov Radiation Angle, Topological Charge, and Conversion Efficiency Varying with the Poling Period

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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 $l = 40$ .

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