Generation of a three-dimensional array of optical bottle beams by use of an orthogonal binary phase plate

摘要

The passage of a beam through an orthogonal two-dimensional binary phase plate (BPP) is analyzed. It is found that, when the phase modulation difference of the two type lattices of the BPP is not equal to ?, an extra central spot corresponding to the direct current component (DC component) will be obtained, besides the common central four symmetrical bright spots and many outer symmetrical weak spots in the spatial spectrum. By use of a low-pass filter, a three- dimensional array of optical bottle beams can be generated via the interference of the five plane waves from the central five spots in the spatial spectrum due to the modulated phase distribution of the BPP. This method has a high energy efficiency more than 90% and its feasibility is de- monstrated experimentally.