Linear and nonlinear operation of a time-to-space processor.
Linear and nonlinear operation of a time-to-space processor.
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DOI：
10.1364/josaa.18.000448
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发表时间：
2001-02
期刊：
影响因子：
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通讯作者：
D. Marom;D. Panasenko;P. Sun;Y. Fainman
中科院分区：
文献类型：
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作者：
D. Marom;D. Panasenko;P. Sun;Y. Fainman
研究了一种基于三波混频的超快波形瞬时成像时空处理机的工作特性。我们评估了各种系统参数对处理器的重要属性：操作时间窗口和信号转换效率的影响。采用高斯脉冲轮廓和高斯空间模模型，同时考虑了线性和非线性两种工作模式。该模型使我们能够为处理器定义分辨率度量，这被发现是一个重要的特征。当处理器工作在线性相互作用区域时，我们发现时间信号到空间图像的转换效率与分辨率度量成反比。在非线性相互作用区域，基波耗尽引起的非均匀信号转换导致了一种可以用来增强成像操作的现象。我们从实验上验证了这种非线性操作。
The operational characteristics of a time-to-space processor based on three-wave mixing for instantaneous imaging of ultrafast waveforms are investigated. We assess the effects of various system parameters on the processor's important attributes: time window of operation and signal conversion efficiency. Both linear and nonlinear operation regimes are considered, with use of a Gaussian pulse profile and a Gaussian spatial mode model. This model enables us to define a resolution measure for the processor, which is found to be an important characteristic. When the processor is operated in the linear interaction regime, we find that the conversion efficiency of a temporal signal to a spatial image is inversely proportional to the resolution measure. In the nonlinear interaction regime, nonuniform signal conversion due to fundamental wave depletion gives rise to a phenomenon that can be used to enhanced the imaging operation. We experimentally verify this nonlinear operation.