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Beam shaping method for simultaneously modulating amplitude and phase

A technique of modulating amplitude and beam shaping, which is applied in optics, optical components, instruments, etc., can solve problems such as complex calculations and beam shaping shape limitations, and achieve good convergence effects, convenient operation, and simple steps

Active Publication Date: 2014-03-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a beam shaping method capable of simultaneously modulating the amplitude and phase, and its purpose is to overcome the problems in the prior art that only the beam amplitude can be shaped, or the shape of the beam shaping is limited and the calculation is complicated

Method used

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  • Beam shaping method for simultaneously modulating amplitude and phase
  • Beam shaping method for simultaneously modulating amplitude and phase
  • Beam shaping method for simultaneously modulating amplitude and phase

Examples

Experimental program
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Embodiment 2

[0056] The beam target field amplitude that needs to be obtained is a sinusoidal distribution, and the width of the curve is 2 pixels, that is

[0057] A = 1 ( 50 sin ( n - 256.5 ) - 1 ≤ n 50 sin ( n - 256.5 ) + 1,128 m ...

Embodiment 3

[0063] The beam target field amplitude that needs to be obtained is six straight lines, and the width of each straight line is two pixels, namely

[0064] A = 1 ( 128 n 385,120 ≤ m 123,160 ≤ m 163,200 ≤ m 203,240 ≤ m 243 , 280 ≤ m ...

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Abstract

The invention discloses a beam shaping method for simultaneously modulating amplitude and phase. The method includes the steps: adjusting the background of an object field by building the beam object field and a filter to obtain a simulated object field; simulating the propagation process and the back propagation process of beams by a computer; filtering a calculated light field of an output plane by a filter and reserving the phase outside an object region; multiplying the simulated object field with the reserved phase to serve as new light field complex amplitude for next circular calculation to obtain a single phase hologram; shaping the beams into beams with the amplitude and the phase distributed as needed in the object region of the output plane by the aid of the phase hologram. The method with the simple steps is convenient in operation and fine in convergence effect, the shapes of the beams are arbitrarily set without any constraint, and the beams in various shapes and phase distribution can be manufactured.

Description

technical field [0001] The invention belongs to the field of beam shaping, in particular to a beam shaping method for simultaneously modulating amplitude and phase. Background technique [0002] As the application fields of optical tweezers become wider and wider, beam shaping technology has also been greatly developed, and various new beams have been produced one after another. G-S algorithm [1] is one of the most commonly used beam shaping algorithms, with fast convergence speed, short calculation time, and simple operation, but generally only achieves amplitude shaping. Later, in the application of optical tweezers, it was found that the intensity gradient force of the beam can trap particles, while the phase gradient force can drive particles. Therefore, it is necessary to realize simultaneous shaping of the amplitude and phase of the beam. [0003] In the prior art (documents [2-6]), there are simultaneous shaping methods for the amplitude and phase of the beam, but t...

Claims

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Application Information

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IPC IPC(8): G02B27/09
Inventor 袁战忠陶少华
Owner CENT SOUTH UNIV