Abstract This History” of Upconversion (UC), starts from a critical discussion about the idea of Bloembergen for an Infra Red Quantum Counter (IRQC) with my thesis Director: “it could not be a thesis subject because during the ions lifetimes not enough energy could be stored”. So it has not been my thesis subject which has been “glass lasers at 1,5microns”, but the object of my thoughts at home all the time. It directed me towards energy transfers study and the discovery of accepting ions already in their excited states which are the necessary steps for UC.

中文翻译：

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上转换发现的历史及其演变

Abstract This History” of Upconversion (UC), 从关于 Bloembergen for an Infra Red Quantum Counter (IRQC) 想法的批判性讨论开始，我的论文主任：“它不可能成为论文主题，因为在离子寿命期间没有足够的能量可以储存”。所以我的论文主题不是“1.5微米的玻璃激光”，而是我一直在家思考的对象。它引导我进行能量转移研究和发现接受已经处于激发态的离子，这是 UC 的必要步骤。