Phase modulating apparatus and phase modulating method

Abstract

An adder unit reads a desired CGH pattern from a pattern memory unit and a phase distortion correction pattern from a distortion-correction pattern memory unit and adds both patterns together to generate a phase distortion corrected pattern. A control unit controls a phase modulation module in accordance with the phase distortion corrected pattern. Accordingly, phase-modulated light based on the desired phase pattern can be generated precisely, easily and quickly.

1 . A computer program recorded on a computer readable recording medium, executed by a computer, comprising: 
 instructions for preparing a desired phase pattern;    instructions for preparing a wavefront-distortion correction phase pattern for correcting a wavefront distortion of light; and    instructions for adding the desired phase pattern and the wavefront-distortion correction phase pattern to generate a distortion corrected phase pattern, the wavefront-distortion correction phase pattern including a phase pattern for correcting a wavefront distortion induced by a phase modulated spatial light modulator.    
   
   
       2 . The computer program according to  claim 1 , wherein the wavefront-distortion correction phase pattern includes a phase pattern generated by inverting a sign of a wavefront-distortion phase pattern indicating a wavefront distortion induced by an input/output surface of the phase modulated spatial light modulator.  
   
   
       3 . A computer program recorded on a computer readable recording medium, executed by a computer, comprising: 
 instructions for preparing a desired phase pattern;    instructions for preparing a wavefront-distortion correction phase pattern for correcting a wavefront distortion of light; and    instructions for adding the desired phase pattern and the wavefront-distortion correction phase pattern to generate a distortion corrected phase pattern, wherein    when a sum of the desired phase pattern and the wavefront-distortion correction phase pattern has a negative value, or a value equal to or more than 2π, a remainder obtained by dividing the sum by 2π is used as the distortion corrected phase pattern.    
   
   
       4 . The computer program according to  claim 3 , wherein the wavefront-distortion correction phase pattern includes a phase pattern generated by inverting a sign of a wavefront distortion phase pattern indicating the wavefront distortion of the light.  
   
   
       5 . The computer program according to  claim 3 , further comprising instructions for storing the wavefront-distortion correction phase pattern, wherein the instructions for adding reads the wavefront-distortion correction phase pattern stored by the instructions for storing, and then adds the wavefront-distortion correction phase pattern to the desired phase pattern.  
   
   
       6 . The computer program according to  claim 3 , further comprising instructions for receiving the wavefront-distortion correction phase pattern, wherein the instructions for adding adds the received wavefront-distortion correction phase pattern to the desired phase pattern.  
   
   
       7 . A computer program recorded on a computer readable recording medium, executed by a computer, comprising: 
 instructions for preparing a desired phase pattern;    instructions for preparing a wavefront-distortion correction phase pattern for correcting a wavefront distortion of light; and    instructions for adding the desired phase pattern and the wavefront-distortion correction phase pattern to generate a distortion corrected phase pattern, the distortion corrected phase pattern being used for driving a reflection type of phase modulated spatial light modulator.    
   
   
       8 . A computer-readable storage medium storing a program executed by a computer for: 
 preparing a desired phase pattern;    preparing a wavefront-distortion correction phase pattern for correcting a wavefront distortion of light; and    adding the desired phase pattern and the wavefront-distortion correction phase pattern to generate a distortion corrected phase pattern, the wavefront-distortion correction phase pattern including a phase pattern for correcting a wavefront distortion induced by a phase modulated spatial light modulator.    
   
   
       9 . The computer-readable storage medium according to  claim 8 , wherein when a sum of the desired phase pattern and the wavefront-distortion correction phase pattern has a negative value, or a value equal to or more than 2π, a remainder obtained by dividing the sum by 2π is used as the distortion corrected phase pattern.  
   
   
       10 . The computer-readable storage medium according to  claim 8 , wherein the phase modulated spatial light modulator is a reflection type, and the distortion corrected phase pattern is used for driving the phase modulated spatial light modulator.