Abraham Emmanuel, Cahyadi Harsono, Brossard Mathilde, Degert Jérôme, Freysz Eric, Yasui Takeshi
Opt Express. 2016 Mar 7;24(5):5203-5211. doi: 10.1364/OE.24.005203.
Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system composed of a ZnTe crystal and a CMOS camera. We quantitatively determined the deformations of planar and converging spherical wavefronts using the modal Zernike reconstruction least-squares method. Associated with deformable mirrors, the sensor will also open the route to terahertz adaptive optics.
太赫兹脉冲的波前特性对于优化时域（成像）光谱仪的远场强度分布或提高强太赫兹源的峰值功率至关重要。在本文中，我们报告了使用与由ZnTe晶体和CMOS相机组成的二维电光成像系统相关联的哈特曼传感器对太赫兹脉冲进行波前测量的情况。我们使用模态泽尼克重建最小二乘法定量确定了平面和会聚球面波前的变形。与可变形镜相关联，该传感器还将为太赫兹自适应光学开辟道路。
