PSEUDO SPECKLE PATTERN PRODUCTION DEVICE, PSEUDO SPECKLE PATTERN GENERATION METHOD, OBSERVER DEVICE AND OBSERVATION METHOD

摘要

A pseudo-speckle pattern generating device 1A includes a first spatial light modulator 13, a lens 14, a second spatial light modulator 15, a lens 16, and the like. The first spatial light modulator 13 has a first intensity modulation distribution, which is based on a pseudo random number pattern, and spatially modulates the intensity of the light yield of a light source 11 and increases the beam diameter by means of a beam expander 12. The second spatial light modulator 15 has a second intensity modulation distribution based on a filter function is provided on a plane on which a Fourier transformation pattern is generated by the lens 14 and spatially modulates the intensity of the light reached by the lens 14. The lens 16 optically Fourier transforms a pattern of light output from the second spatial light modulator 15 to produce a Fourier-transformed pattern as a pseudo-speckle pattern. Thus, it is possible to realize a pseudo-speckle pattern generating device and the like that offers a high degree of freedom in setting a spatial structure or a statistical light intensity distribution of a speckle pattern to be generated.