Phase Modulation Plane Segmentation for Intensity Control
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Solution Overview
Problem
Conventional phase modulation methods require complex calculations to achieve high accuracy in determining phase distributions for desired intensity distributions in microscopy and laser processing, lacking a simple and efficient approach.
Innovation Solution
A phase modulation method and apparatus that includes a spatial light modulator with a phase modulation plane and a measurement section to determine intensity distributions, allowing for the calculation and display of phase distributions that result in modulated light with predetermined intensity profiles, such as top hat or annular zone shapes, by dividing regions on the phase modulation and target planes to achieve accurate intensity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional phase modulation methods are used to achieve high accuracy in determining phase distributions, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the phase modulation plane into multiple discrete regions (first region and second region) with different phase shifts. By segmenting the continuous phase distribution into discrete zones, the system achieves accurate intensity distribution control through simpler binary or multi-level phase control, rather than requiring complex continuous phase calculations.
Solution Approach 2:
The patent changes the phase parameter values in different regions of the spatial light modulator (first phase value in first region, second phase value in second region). By adjusting these discrete phase parameters, the system achieves desired intensity distributions without requiring complex continuous phase calculations, thus simplifying the overall calculation process while maintaining accuracy.
2Manufacturing precision
If conventional phase modulation methods are used to realize desired intensity distributions, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent segments the phase modulation plane into distinct regions with different phase values, transforming the complex problem of continuous phase distribution determination into a simpler discrete region classification problem. This segmentation allows for easier control and adjustment while achieving precise intensity distribution patterns.
Solution Approach 2:
The patent simplifies operation by changing discrete phase parameters in different regions rather than calculating complex continuous phase distributions. The system determines which regions should have first phase values and which should have second phase values based on the desired intensity distribution, making the operation more intuitive and easier to implement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the simple and accurate determination of phase distributions for achieving desired intensity distributions, such as top hat or annular zone shapes, with high precision, suitable for applications requiring high light intensity and precise beam control.
Implementation Method 1
a phase distribution to be displayed on the phase modulation plane 20a is calculated... a control signal corresponding to the phase distribution is input to the spatial light modulator 20... the spatial light modulator 20 displays the phase distribution on the phase modulation plane 20a... modulates readout light P1 having entered the phase modulation plane 20a to generate modulated light P2
Data Source
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AI summary
A phase modulation method is provided which can simply determine a phase distribution for realizing a desired intensity distribution with high accuracy. A phase distribution to be displayed on a phase modulation plane 20a is calculated such that modulated light P2 has a predetermined intensity distribution on a target plane TA, the phase distribution is displayed on the phase modulation plane 20a, readout light P1 is caused to enter the phase modulation plane 20a so as to generate the modulated light P2. When calculating the phase distribution, a region on the phase modulation plane 20a is divided into N regions A1 ... AN, and sizes of the regions are set such that integration values of an intensity distribution in the regions A1 ... AN are equal to each other. Further, a region on the target plane TA is divided into N regions B1 ... BN, and sizes of the regions are set such that integration values of an intensity distribution in the regions B1 ... BN are equal to each other. The phase distribution is calculated by obtaining an optical path length Ln from the region An to the region Bn, and determining the phase of the region An based on the optical path length Ln.