Synthetic Optical Holography

摘要

Methods and apparatus for imaging a phase or amplitude that characterizes a scattered field emanating from a physical medium. A local probe is stepped to a plurality of successive probe positions and illuminated with an illuminating beam, while a specified phase function is imposed on a reference beam relative to the illuminating beam. A field associated with the scattered field is superimposed with the reference beam and the detection of both yields a detected signal which is recorded as a function of probe position in order to obtain a hologram. The holograph is transformed, filtered, and retransformed to generate an image. Alternatively, the illuminating beam may directly illuminate successive positions of the physical medium.

主权项

1. A method for imaging at least one of a phase and an amplitude characterizing a scattered field emanating from a sample, the method comprising:
a. sequentially scanning a parameter characterizing the sample to a plurality of successive loci of a hologram dimension; b. illuminating the sample with a focusing illuminating beam; c. imposing a specified phase function on a reference beam relative to the illuminating beam; d. superimposing with the reference beam a field associated with the scattered field; e. detecting the superimposed reference beam and field associated with the scattered field for each locus to produce a detected signal; f. recording the detected signal as a function of locus in order to obtain a hologram; and g. processing the hologram to generate an image of at least one of phase and amplitude associated with the scattered field.