论文部分内容阅读
多光子过程,1931年就有人做过理论预言[1],长期以来主要从学术兴趣方面去考虑。由于双光子吸收与强度的平方关系,吸收过程能产生空间限定激发,可用于三维数据存储和三维成像[2,3]。高效双光子灵敏材料的发展,带来很多技术应用[4~28],并且激起了开发以三光子激发为基础的应用[29]兴趣。三光子过程可使用较长的激发波长,如光通信中通常使用的那些波长。而且,三光子过程和输入光强的立方关系提供更强的空间限定,在成像中可得到更高的对比度。本文报道在有机发色团溶液中,在1.3mm同时发生强烈的三光子吸收,以放大自发辐射产生高度定向上转换受激发射的观测。这个进展意味着,在频率上转换激光领域、短脉冲光通信领域和新兴的生物光子学领域为三光子过程提供了机遇。
Multiphoton process, someone made a theoretical prediction in 1931 [1], has long been mainly from academic interest to consider. Due to the square relationship between the two-photon absorption and the intensity, the absorption process can generate a space-limited excitation and can be used for three-dimensional data storage and three-dimensional imaging [2,3]. The development of highly efficient two-photon sensitive materials has led to many technical applications [4-28] and has sparked interest in developing applications based on three-photon excitation [29]. Three-photon processes can use longer excitation wavelengths, such as those commonly used in optical communications. Moreover, the cubic relationship between the three-photon process and the input light intensity provides a more limited spatial definition and allows for higher contrast in imaging. This paper reports the intense three-photon absorption at 1.3mm in organic chromophore solution to amplify the spontaneous emission to produce highly directional up-conversion stimulated emission observations. This progress means that the field of frequency conversion lasers, short pulse optical communications and the emerging field of biophotonics offer opportunities for three-photon processes.