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丰田工业大学的前田佳伸讲师等用掺Ｅｒ玻璃开发出基于负性非线性吸收效应的光运算元件。负性非线性吸收效应是几年前该讲师在掺ＥｒＹＡＧ晶体中发现的：当提高输入的激光强度时出现强烈吸收；反之，激光强度降低时吸收变弱。因此，当输入的是经调制的光信号时，便能得到反转
Maeda Maeda lecturer at Toyota University of Technology developed a light operation device based on a negative non-linear absorption effect with Er-doped glass. The negative nonlinear absorption effect was discovered several years ago by the lecturer in ErYAG-doped crystals: strong absorption when increasing the input laser intensity; conversely, the absorption becomes weaker when the laser intensity decreases. Therefore, when a modulated optical signal is input, it is inverted