The manipulation of second-order nonlinear harmonic wave by structured material and structured light

Liu, Haigang; Chen, Xianfeng

doi:10.1142/s0218863518500479

“…Such elements are called nonlinear photonic crystals as the modulation of the nonlinear susceptibility affects the beam generation and propagation [25][26][27][28][29][30][31]. There are demonstrations of a binary hologram in a nonlinear crystal [32], a structured element combined with structured light [33,34] or plasmonic metasurfaces [35]. Such 3D structured nonlinear crystals act as volume holograms or phased arrays and in theory give more degrees of freedom as a thin hologram.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Controlled Nonlinear Computer-Generated Holography

Ackermann¹,

Roider²,

Cvecek³

et al. 2023

Preprint

0

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Dynamic phase-only beam shaping with a liquid crystal spatial light modulator is a powerful technique for tailoring the intensity profile or wave front of a beam. While shaping and controlling the light field is a highly researched topic, dynamic nonlinear beam shaping has hardly been explored so far. One potential reason is that generating the second harmonic is a degenerate process as it mixes two fields at the same frequency. To overcome this problem, we propose the use of type II phase matching as a control mechanism to distinguish between the two fields. Our experiments demonstrate that distributions of arbitrary intensity can be shaped in the frequency-converted field at the same quality as for linear beam shaping and with conversion efficiencies similar to without beam shaping. We envision this method as a milestone toward beam shaping beyond the physical limits of liquid crystal displays by facilitating dynamic phase-only beam shaping in the ultraviolet spectral range.

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“…Such elements are called nonlinear photonic crystals as the modulation of the nonlinear susceptibility affects the beam generation and propagation 28 – 34 . There are demonstrations of a binary hologram in a nonlinear crystal 35 , a structured element combined with structured light 36 , 37 or plasmonic metasurfaces 38 , 39 . Such 3D structured nonlinear crystals act as volume holograms or phased arrays and in theory give more degrees of freedom as a thin hologram.…”

Section: Introductionmentioning

confidence: 99%

Polarization-controlled nonlinear computer-generated holography

Ackermann

¹

,

Roider

²

,

Cvecek

³

et al. 2023

Sci Rep

0

View full text Add to dashboard Cite

Dynamic phase-only beam shaping with a liquid crystal spatial light modulator is a powerful technique for tailoring the intensity profile or wave front of a beam. While shaping and controlling the light field is a highly researched topic, dynamic nonlinear beam shaping has hardly been explored so far. One potential reason is that generating the second harmonic is a degenerate process as it mixes two fields at the same frequency. To overcome this problem, we propose the use of type II phase matching as a control mechanism to distinguish between the two fields. Our experiments demonstrate that distributions of arbitrary intensity can be shaped in the frequency-converted field at the same quality as for linear beam shaping and with conversion efficiencies similar to without beam shaping. We envision this method as a milestone toward beam shaping beyond the physical limits of liquid crystal displays by facilitating dynamic phase-only beam shaping in the ultraviolet spectral range.

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Dual‐Wavelength Focusing through Fresnel Zone Plate Fabricated in Lithium Niobate Crystal by Femtosecond Laser Micromachining

Zhu

¹

,

Liu

²

,

Liu

³

et al. 2020

Physica Rapid Research Ltrs

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Herein, a simple method is proposed that realizes the dual‐wavelength focusing of second‐harmonic (SH) and fundamental frequency (FF) through amplitude‐type nonlinear Fresnel zone plate (FZP). The FZP is fabricated by femtosecond laser micromachining with 0 or +1 binary modulation of quadratic susceptibility in lithium niobate crystal. The evolution of the SH beam focusing intensity patterns with 2 cm focal length at 532 nm wavelength is theoretically and experimentally studied. Based on the birefringence phase matching, the measured normalized conversion efficiency for peak power of 1.9 × 10−5% W−1 cm−2 is achieved in the SH focal spot. The amplitude‐type nonlinear FZP realizes the focusing of the FF beam and SH beam simultaneously, which opens wide possibilities in the integration of laser beam shaping, nonlinear frequency conversion, and laser focusing for ultra‐compact on‐chip device requirement.

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The manipulation of second-order nonlinear harmonic wave by structured material and structured light

Cited by 7 publications

References 78 publications

Polarization-Controlled Nonlinear Computer-Generated Holography

Polarization-Controlled Nonlinear Computer-Generated Holography

Polarization-controlled nonlinear computer-generated holography

Dual‐Wavelength Focusing through Fresnel Zone Plate Fabricated in Lithium Niobate Crystal by Femtosecond Laser Micromachining

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