Ultrafast measurement of two-photon absorption by loss modulation

被引：80

作者：

Tian, PF ^{[1
]}

Warren, WS

机构：

[1] Princeton Univ, Ctr Ultrafast Laser Applicat, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[3] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

OPTICS LETTERS | 2002年 / 27卷 / 18期

关键词：

D O I：

10.1364/OL.27.001634

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate a direct and sensitive technique for measuring two-photon absorption (TPA). An intensity-modulated femtosecond laser beam passes through a sample exhibiting TPA. A TPA signal at twice the modulation frequency is then generated and subsequently measured by a lock-in amplifier. The absolute TPA cross section of Rhodamine 6G at 800 mn is found to be (15.3 +/- 2.0) X 10(-50) cm(4) s/photon and agrees well with previously published results obtained with much higher intensity [J. Chem. Phys. 112, 9201 (2000)]. Our method may be especially useful in measuring nonlinear absorptions of nonfluorescent materials. (C) 2002 Optical Society of America.

引用

页码：1634 / 1636

页数：3

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