Chenoweth A J, Gaddy O L, Holshouser D F
Department of Electrical Engineering,University of Illinois, Urbana, USA.
Appl Opt. 1966 Oct 1;5(10):1652-6. doi: 10.1364/AO.5.001652.
Carbon disulfide has identical microwave and optical dielectric constants, as well as extremely low optical and microwave loss. These properties make it possible to construct long travelingwave light modulators at microwave frequencies using the Kerr electrooptic effect induced in CS(2) by an electric field propagating on a TEM transmission line.Several experiments with traveling-wave Kerr cells consisting of resonant strip transmission lines immersed in CS(2) are described. A decrease in the microwave power required for modulation by a factor of two, by cooling the modulators to a temperature of -55 degrees C, is demonstrated. Simultaneous modulation of light at two microwave frequencies by excitation of two of the longitudinal modes of the strip line resonator is also described. Relatively high efficiency modulation with long devices of this type is also reported. In these experiments, the microwave power required for large depths of modulation is reduced by almost two orders of magnitude compared to previously reported CS(2) light modulators, and is within less than a factor of two of the calculated power for cells up to 44 cm in length. For longer cells, increasingly larger than predicted powers are required.
二硫化碳具有相同的微波和光学介电常数，以及极低的光学和微波损耗。这些特性使得利用在TEM传输线上传播的电场在CS₂中诱导产生的克尔电光效应，在微波频率下构建长行波光调制器成为可能。描述了几个关于由浸没在CS₂中的谐振带状传输线组成的行波克尔盒的实验。通过将调制器冷却到-55摄氏度，证明调制所需的微波功率降低了一半。还描述了通过激发带状线谐振器的两个纵向模式同时在两个微波频率上调制光的情况。也报道了这种类型的长器件具有相对较高的效率调制。在这些实验中，与先前报道的CS₂光调制器相比，实现大调制深度所需的微波功率降低了近两个数量级，对于长度达44厘米的盒体，所需功率不到计算功率的两倍。对于更长的盒体，所需功率比预测的越来越大。
