Preda Fabrizio, Perri Antonio, Réhault Julien, Dutta Biplab, Helbing Jan, Cerullo Giulio, Polli Dario
Opt Lett. 2018 Apr 15;43(8):1882-1885. doi: 10.1364/OL.43.001882.
We introduce a novel configuration for the broadband measurement of the optical activity of molecules, combining time-domain detection with heterodyne amplification. A birefringent common-path polarization-division interferometer creates two phase-locked replicas of the input light with orthogonal polarization. The more intense replica interacts with the sample, producing a chiral free-induction decay field, which interferes with the other replica, acting as a time-delayed phase-coherent local oscillator. By recording the delay-dependent interferogram, we obtain by a Fourier transform both the circular dichroism and circular birefringence spectra. Our compact, low-cost setup accepts ultrashort light pulses, making it suitable for measurement of transient optical activity.
我们介绍了一种用于分子光学活性宽带测量的新型配置，它将时域检测与外差放大相结合。一个双折射共路偏振分束干涉仪产生两个具有正交偏振的输入光的锁相复制品。强度较高的复制品与样品相互作用，产生一个手性自由感应衰减场，该场与另一个复制品干涉，后者充当时间延迟的相位相干本地振荡器。通过记录依赖于延迟的干涉图，我们通过傅里叶变换获得圆二色性和圆双折射光谱。我们紧凑、低成本的装置可接受超短光脉冲，使其适用于瞬态光学活性的测量。
