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Quadratic nonlinear optical properties of La3Ga5.5Nb0.5O14 (LGN) and periodically-poled Rb : KTiOPO4 (PPRKTP) crystals

Abstract : Nonlinear optics converting the frequency range of laser sources to ultraviolet, visible, infrared or terahertz ranges for example, plays a crucial role in medicine, industry, military applications, research and so on. Birefringence phase-matching (BPM) or quasi-phase-matching (QPM) from quadratic nonlinear processes, can be used for frequency conversion in the transparency range of nonlinear crystals. In this PhD work, a La3Ga5.5Nb0.5O14 (LGN) uniaxial crystal was grown using a Czochralski method and then studied for BPM. We also validated the theory of angular-QPM (AQPM), corresponding to a generalization of QPM achieved at any angle with respect to the grating vector. For that purpose, we studied a periodically-poled large-aperture Rb:KTiOPO4 (PPRKTP) biaxial crystal cut a sphere. All the results provide a reliable basis for further studies devoted to the design of frequency conversion devices.
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https://tel.archives-ouvertes.fr/tel-01903306
Contributor : Abes Star :  Contact
Submitted on : Wednesday, October 24, 2018 - 11:40:06 AM
Last modification on : Wednesday, November 3, 2021 - 6:22:37 AM
Long-term archiving on: : Friday, January 25, 2019 - 2:18:40 PM

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LU_2018_diffusion.pdf
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  • HAL Id : tel-01903306, version 1

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STAR | CNRS | UGA | NEEL

Citation

Dazhi Lu. Quadratic nonlinear optical properties of La3Ga5.5Nb0.5O14 (LGN) and periodically-poled Rb : KTiOPO4 (PPRKTP) crystals. Cristallography. Shandong University (Jinan, Chine), 2018. English. ⟨NNT : 2018GREAT042⟩. ⟨tel-01903306⟩

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