Radially polarized annular beam generated through a second-harmonic-generation process.
Radially polarized annular beam generated through a second-harmonic-generation process.
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DOI：
10.1364/ol.34.003166
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发表时间：
2009-10
期刊：
影响因子：
3.6
通讯作者：
S. Sato;Y. Kozawa
中科院分区：
文献类型：
--
作者：
S. Sato;Y. Kozawa
通过将方位偏振的钛宝石脉冲激光束聚焦到c切β-硼酸钡（BBO）晶体上，通过二次谐波产生过程产生具有环形强度图案的径向偏振光束。由于BBO晶体的非线性极化率张量，二次谐波的环形强度图案具有近六倍对称性。环的宽度窄至小于其半径的1/40。
A radially polarized beam with an annular intensity pattern was generated through a second-harmonic-generation process by focusing an azimuthally polarized Ti:sapphire pulsed laser beam to a c-cut beta-barium borate (BBO) crystal. The annular intensity pattern of the second-harmonic wave had a nearly sixfold symmetry as a result of the nonlinear susceptibility tensor of the BBO crystal. The width of the annulus was as narrow as less than 1/40th of its radius.