Study of sequential two photon absorption and conduction band electrons absorption in ZnSe

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• 作者：DeGui Kong ; GuangHong Ao ; YaChen Gao ; Qing Chang ; WenZhi Wu ; LingLing Ran ; Hong'An Ye
• 关键词：Two photon absorption ; One photon absorption ; Femtosecond
• 刊名：Physica B
• 出版年：2012
• 出版时间：1 November, 2012
• 年：2012
• 卷：407
• 期：21
• 页码：4251-4253
• 全文大小：210 K

文摘

Using the Z-scan technique and pump-probe technique with 130 fs laser pulses at 800 nm, we verify that an intraband one-photon absorption follows the interband two photon absorption. Particularly, we find that there is an intraband relaxation interspersed between these two absorption processes for some of the conduction band electrons but not all of them. In this study, we measure the interband two photon absorption coefficient and the absorptive cross sections associated with both excitation pathways within the conduction band. In addition, we estimate the time for relaxation of electrons within the conduction band to be 250 fs.