The wavefront measurement accuracy of a grating array based zonal wavefront sensor (GAWS) can be affected by the non-uniform focal spot array and unwanted orders in the detector plane. The non-uniform focal spot array is the outcome of the non-uniform nature of the incident illumination beam’s intensity profile. This paper describes a method that dynamically modulates the laser beam’s intensity using computer generated holography, making the focal spot array uniform and eliminating unwanted spots in a detector plane, thereby enhancing the accuracy of the wavefront measurement. Here, we present proof-of-principle simulation results that demonstrate the working of the proposed improvements in GAWS.
One important parameter in the case of translation of an optically trapped particle is the maximum achievable speed of translation in optical trapping. While the parameter is expected to have a dependence on the particle diameter and the viscosity of the medium, there will also be dependence on the laser power and step size of the moving trap. In this paper, we will experimentally investigate the maximum translation speed of a given trapped particle in a certain medium achievable in a holographic optical trap. We will implement the holographic trap using a liquid crystal spatial light modulator with a computer interface and use latex beads in water for trapping.
Spot diagrams are the intersection coordinate points in the image plane of the incoming rays from a point object. When the point object is imagined to be at infinity, the spot diagram can be considered as a representation of the point spread function (PSF) of the imaging lens. The performance of an imaging system for various applications can be analyzed with the help of the spot diagrams. In this paper, we will present our work using exact ray tracing that can be employed to compute the spot diagrams of both scalar and vector beams such as radially polarized beam, azimuthally polarized beam, etc.
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