MEASUREMENTS OF MULTIPHOTON CROSS SECTIONS FOR SEVERAL PHOTOSENSITIZERS

在过去的一年里，我们完成了对 光子晶体的双光子作用截面已经开始 其他光敏化合物的额外测量。在……下面 典型的成像条件下，可以观察到Photofrin从 从单光子激发到双光子激发 波长范围为700-750 nm。这一点已经通过测量边缘得到了验证 以甲醇为溶剂的感光材料溶液的响应 波长的函数。对于波长在750到980纳米之间的 双光子作用截面从大约0.6 GM减小到 0.2 GM。绝对和相对横截面测量都有 已经做出并被发现同意了。双光子激发截面 其他光敏剂正处于不同的完成阶段和 在别处进行了描述和解释。

During the previous year we have completed the measurement of the two-photon action cross section for Photofrin and have begun additional measurements for other photosensitizing compounds. Under typical imaging conditions, Photofrin is observed to change from one-photon to two-photon excitation as the excitation wavelength is varied from 700-750 nm. This has been verified by measuring the edge response from a solution of Photofrin dissolved in methanol as a function of wavelength. For wavelengths between 750 and 980 nm the two-photon action cross section decreases from approximately 0.6 GM to 0.2 GM. Both absolute and relative cross section measurements have been made and found to agree. The two-photon excitation cross section of other photosensitizers are at various stages of completion and described and accounted for elsewhere.