二次谐波显微镜中的平衡零差检测
Balanced homodyne detection in second-harmonic generation microscopy
摘要：
我们展示了双光子非线性显微镜与平衡零差探测的关联，用于研究纳米尺度下的二次谐波辐射特性。二次谐波和基本光束之间的相对相位的变化被检索，作为非线性发射器的绝对取向的函数。灵敏度下降到约3.2光子/s的本地振荡器的时空模式。该值足够高以有效地检测来自亚波长尺寸的单个KTiOPO 4晶体的相干二次谐波发射。
英文摘要：
We demonstrate the association of two-photon nonlinear microscopy with balanced homodyne detection for investigating second harmonic radiation properties at nanoscale dimensions. Variation of the relative phase between second-harmonic and fundamental beams is retrieved, as a function of the absolute orientation of the nonlinear emitters. Sensitivity down to approximately 3.2 photon/s in the spatio-temporal mode of the local oscillator is obtained. This value is high enough to efficiently detect the coherent second-harmonic emission from a single KTiOPO4 crystal of sub-wavelength size.
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