Orbital angular momentum in noncollinear second-harmonic generation by off-axis vortex beams
Orbital angular momentum in noncollinear second-harmonic generation by off-axis vortex beams
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DOI：
10.1364/josab.28.002806
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发表时间：
2011-11-01
影响因子：
1.9
通讯作者：
Sibilia, Concita
中科院分区：
文献类型：
--
作者：
Bovino, Fabio Antonio;Braccini, Matteo;Sibilia, Concita
实验研究了光在非共线二次谐波产生过程中的轨道角动量（OAM）行为。实验采用I型BBO晶体，在830nm的飞秒抽运场下，在相位匹配条件下进行。两个镜面离轴涡旋光束在基频上携带分数OAM。我们分析了当每个输入场的光旋涡在FF处偏离光束轴时，二次谐波信号的OAM的行为。我们得到了SH场的不同空间构型，它们总是带有相同的零角动量。(C) 2011美国光学学会
We experimentally study the behavior of orbital angular momentum (OAM) of light in a noncollinear second-harmonic generation process. The experiment is performed by using a Type I BBO crystal under phase-matching conditions with femtosecond pumping fields at 830nm. Two specular off-axis vortex beams carrying fractional OAM at the fundamental frequency are used. We analyze the behavior of the OAM of the second-harmonic (SH) signal when the optical vortex of each input field at the FF is displaced from the beam's axis. We obtain different spatial configurations of the SH field, always carrying the same zero angular momentum. (C) 2011 Optical Society of America