Measurement of the cubic nonlinear susceptibility in lithium niobate
Year: 2025
Type: article
Abstract: We measured the cubic nonlinear susceptibility tensor elements (χ(3)) for polarization along the primary crystallographic axis in titanium-indiffused lithium niobate waveguides, assessed through self-phase modulation using picosecond-duration pulses at telecommunication wavelengths. A dominant, highly temperature- and wavelength-dependent contribution from a cascaded second-order nonlinearity is observed. Through careful extraction of the cascaded effect, we quantify the intrinsic third-order susceptibility tensor elements as χ z z z z (3)(ω;ω,ω,−ω)=(5.2±1.3)×10−21m2V2 and χ x x x x (3)(ω;ω,ω,−ω)=χ y y y y (3)(ω;ω,ω,−ω)=(3.6±0.8)×10−21m2V2. These measurements underscore the substantial impact of the cascaded nonlinearity in enhancing the effective cubic nonlinearity in lithium niobate and offer precise values essential for the design of nonlinear photonic devices.
Source: Optical Materials Express
DOI: 10.1364/ome.557516
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,843
OpenAlex ID: W4409685995