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

Journals >Chinese Optics Letters >Volume 18 >Issue 7 >Page 071902 > Article

Chinese Optics Letters
Vol. 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

Author Affiliations

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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DOI: 10.3788/COL202018.071902 Cite this Article Set citation alerts

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 Copy Citation Text

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(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 LiNbO3 micro-ring resonator. (c) Illustration of the polar coordinate system and the emitted SH vortex beam with a helical phase front.

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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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. 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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Poling Period (nm)	500	390	330
Radiation angle ( $θ_{c}$ )	45°	60°	70°
Topological charge ( $l$ )	976	674	444
Conversion efficiency	$4.11 \times 10^{- 4}$	$1.68 \times 10^{- 4}$	$2.02 \times 10^{- 5}$