Multiplex coherent anti-stokes Raman scattering (M-CARS) and second harmonic generation (SHG) techniques are used to map the real part of the nonresonant third order nonlinear optical susceptibility and the second order nonlinear optical susceptibility of a thermally microimprinted niobium borophosphate glass. In particular, such bimodal nonlinear imaging is employed in order to precisely evaluate how thermal poling can modify the amplitude of the nonresonant third-order nonlinearity of the sample. A systematic decrease of the M-CARS intensity is found in the poled areas with respect to the unpoled ones, suggesting therefore a reduction of the real part of the nonresonant third order nonlinear susceptibility within these regions. Such a reduction in the M-CARS intensity can be explained by sodium depletion in the subanodic zone and is mostly linked to the reduction of both the matter density and the linear refractive index, in agreement with earlier works on thermal poling on the same family of glasses.

中文翻译：

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绘制热极化微压印铌硼磷酸盐玻璃中的二阶和三阶非线性磁化率

多重相干反斯托克斯拉曼散射 (M-CARS) 和二次谐波生成 (SHG) 技术用于绘制热微压印硼磷酸盐玻璃的非共振三阶非线性光学磁化率和二阶非线性光学磁化率的实部。特别是，采用这种双峰非线性成像是为了精确评估热极化如何修改样本的非共振三阶非线性的幅度。相对于非极化区域，在极化区域中发现 M-CARS 强度的系统性降低，因此表明这些区域内非共振三阶非线性磁化率的实部减少。