Ozkul C, Leroux S, Anthore N, Amara M K, Rasset S
Appl Opt. 1995 Aug 20;34(24):5485-91. doi: 10.1364/AO.34.005485.
The Fraunhofer diffraction pattern of a narrow annular slit is recorded holographically to generate a beam that approximates a diffraction-free Bessel beam. The experimental limitations resulting from the annular-slit parameters such as the opening width and the transmission coefficient are discussed. The reconstructed Bessel beam is amplified by two-wave mixing in a photorefractive crystal. Thus the efficient conversion of a relatively large beam with a constant (or Gaussian) intensity distribution into a nondiffracting beam is achieved entirely by direct physical interference. We show that diffraction-free beams reproduced and amplified in this way can be applied to the measurement of the velocity of small objects by the use of the laser Doppler technique. In addition, the advantages of Bessel beams, especially in measuring the velocity of solids, are discussed.
通过全息记录窄环形狭缝的夫琅禾费衍射图样来生成近似无衍射贝塞尔光束的光束。讨论了由环形狭缝参数（如开口宽度和透射系数）导致的实验限制。重建的贝塞尔光束在光折变晶体中通过两波混频进行放大。因此，将具有恒定（或高斯）强度分布的相对大光束高效转换为无衍射光束完全是通过直接物理干涉实现的。我们表明，以这种方式再现和放大的无衍射光束可应用于利用激光多普勒技术测量小物体的速度。此外，还讨论了贝塞尔光束的优点，特别是在测量固体速度方面的优点。
