Anisotropic beam spreading in uniaxial crystals

被引:33
作者
Ciattoni, A [1 ]
Palma, C
机构
[1] Ist Nazl Fis Mat, Unita Aquila, Laquila, Italy
[2] Univ Aquila, INFM, Dipartimento Fis, I-67010 Laquila, Italy
[3] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy
[4] INFM, Unita Roma 3, Rome, Italy
关键词
diffraction; anisotropic media;
D O I
10.1016/j.optcom.2003.12.025
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The anisotropic spreading of a paraxial beam propagating orthogonally to the optical axis inside a uniaxial crystal is investigated. The lack of rotational invariance around the propagation direction suggests to consider the mean square width (MSW) of the beam in any transverse direction, which turn out to be a quadratic form of the unit vector associated with the considered direction and to depend quadratically on the propagation distance z. The z-evolution of the MSW is compared with its standard evolution in vacuum. A simple connection is establish, for cylindrically symmetric input fields, between the anisotropic and the free space MSW, which in particular allows us to easily picture the spreading of the beam by means of a simple geometrical construction. The particular case of an astigmatic Gaussian beam is analytically carried out. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:79 / 92
页数:14
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