Ultrasensitive femtosecond two-photon detector with resonantly enhanced nonlinear absorption

被引：24
|
作者：
Schneider, H
Maier, T
Liu, HC
Walther, M
Koidl, P
机构：
[1] Fraunhofer Inst Appl Solid State Phys, D-79108 Freiburg, Germany
[2] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada
来源：
OPTICS LETTERS | 2005年 / 30卷 / 03期
关键词：
D O I：
10.1364/OL.30.000287
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report on two-photon detection based on nonlinear absorption between subbands in quantum wells. Resonantly enhanced nonlinear absorption, 6 orders of magnitude higher than that of typical bulk semiconductors, leads to a threshold power density for quadratic detection as low as 0.1 W/cm(2) and to femtosecond time resolution. The approach facilitates dynamic characterization of the optical light field of infrared emitters with unprecedented sensitivity. We also present a new method for determining the intersubband and intrasubband scattering times by means of autocorrelation measurements. (C) 2005 Optical Society of America.
引用
收藏
页码：287 / 289
页数：3
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