Iterative algorithm for performing shaping on amplitude and phase of light beam simultaneously

Abstract

The invention discloses an iterative algorithm for performing shaping on the amplitude and phase of a light beam simultaneously. An input plane and two output planes are utilized to perform shaping on the light beam; free zones distributed for constraint conditions and values of the input plane serve as the amplitude and phase of the incident light respectively; the two output planes (alpha and beta) are overlapped completely, and the amplitude and phase of the target light beam are both divided into two parts to serve as constraint conditions of the amplitudes and phases of the two output planes respectively; amplitude constraint and phase constraint are performed on each output plane simultaneously, constrained zones of the two output planes are complementary, and therefore the amplitude and phase of the outgoing beam are completely constrained. The constrained zones of the output planes of the algorithm are equal to the free zones in area, so that iterative convergence is guaranteed. In this way, shaping of the target beam of amplitude and phase in any shape is achieved, operation is simple, the computation speed is high, and the shaping effect is good.

Description

Technical field [0001] The invention relates to an iterative algorithm for simultaneously shaping the amplitude and phase of a beam. Background technique [0002] Traditional lasers can only produce light beams with Gaussian profile. In order to meet the needs of lasers with various intensity profiles and phase shapes in the fields of material processing, optical capture and laser matching, it is necessary to perform beam shaping on the laser. A spatial light modulator or other optical diffractive elements can be used to modulate the wavefront of the laser to generate an ideal target beam. There are two types of spatial light modulators: pure phase type and pure amplitude type. Pure phase type spatial light modulators have higher diffraction efficiency than pure amplitude type spatial light modulators, so they are more widely used. The spatial light modulator needs to load a specific phase map, that is, a hologram, to complete the expected modulation function. Generally, a beam...

AI Technical Summary

Problems solved by technology

However, the algorithm needs complex adjustments to some parameters to achieve better shaping quality.

[13] proposed a method to generate three-dimensional curved beams with predetermined light intensity and phase, but this method can only generate continuous curved beams and cannot generate beams of arbitrary shape

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