Observation of stimulated emission by direct three-photon excitation
Observation of stimulated emission by direct three-photon excitation
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DOI：
10.1038/415767a
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发表时间：
2002-02-14
期刊：
影响因子：
64.8
通讯作者：
Prasad, PN
中科院分区：
文献类型：
--
作者：
He, GS;Markowicz, PP;Prasad, PN
1931年从理论上预言的多光子过程，在很长一段时间里主要被认为是学术上的兴趣。这种观点改变时，它被证明（2，3），双光子吸收过程中，由于二次依赖强度的激发，可以产生一个空间限制的激发三维数据存储和成像有用。由于高效双光子敏感材料的发展，双光子吸收最近受到了相当大的关注，导致了许多技术应用（4-28）。这些成功引起了人们对探索基于三光子激发的应用的兴趣（29）。对于三光子过程，可以使用更长的激发波长，例如光通信中常见的那些。此外，三光子过程对输入光强度的立方依赖性提供了更强的空间限制，使得可以获得更高的成像对比度。在这里，我们报告的观察高度定向和上转换的受激发射作为放大的自发发射，在有机发色团溶液中产生的强烈的同时三光子吸收在1.3妈妈。这一成就为三光子过程在频率上转换激光、短脉冲光通信和新兴的生物光子学领域提供了机会。
Multiphoton processes, predicted(1) theoretically in 1931, were for a long time considered to be mainly of academic interest. This view changed when it was shown(2,3) that a two-photon absorption process could, because of a quadratic dependence of excitation on intensity, produce a spatially confined excitation useful for three-dimensional data storage and imaging. Two-photon absorption has received considerable attention recently because of the development of highly efficient two-photon-sensitive materials, leading to numerous technological applications(4-28). These successes have created interest in exploring applications based on three-photon excitations(29). For a three-photon process, a longer excitation wavelength such as those common in optical communications can be used. Also, the cubic dependence of the three-photon process on the input light intensity provides a stronger spatial confinement, so that a higher contrast in imaging can be obtained. Here we report the observation of a highly directional and up-converted stimulated emission as an amplified spontaneous emission, produced in an organic chromophore solution by a strong simultaneous three-photon absorption at 1.3 mum. This achievement suggests opportunities for a three-photon process in frequency-upconversion lasing, short-pulse optical communications, and the emerging field of biophotonics.