Size metrology of a pure phase object based on the laser probe beam reshaping

作者：Fromager Michael; Brunel Marc; Ait Ameur Kamel^*

来源：Optics and Lasers in Engineering, 2014, 54: 88-92.

DOI：10.1016/j.optlaseng.2013.10.008

• Laser beam shaping
• Phase object
• Diffraction

We propose a simple method for determining the size of a transparent object based on the reshaping of a laser probe beam which is initially Gaussian in shape. For a given ratio between the sizes of the incident beam and of the phase object, the diffracted laser probe beam is transformed in the far-field region into a hollow beam. The detection of the intensity dip in the beam centre is made with a simple photodiode. The potential of the proposed technique for quantifying the nanoscale change of the phase object could be very useful to study the dynamics of a living cell membrane for instance.

• 出版日期2014-3
• 单位中国地震局