| 摘要 |
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 A 1 ... AN, and sizes of the regions are set such that integration values of an intensity distribution in the regions A 1 ... A N are equal to each other. Further, a region on the target plane TA is divided into N regions B 1 ... B N , and sizes of the regions are set such that integration values of an intensity distribution in the regions B 1 ... B N are equal to each other. The phase distribution is calculated by obtaining an optical path length L n from the region A n to the region B n , and determining the phase of the region A n based on the optical path length L n . |
