31. There are various analytical models which allow the diffracted field to be calculated, including the near field. 32. This is because a plane wave incident on a circular lens or mirror is diffracted as described above. 33. The incident radio wave could be slightly attenuated and there might be some interaction between the diffracted wavefronts. 34. There exists a pair of diffracted beams that co-propagate from the third grating to the camera. 35. When laser light is passed through the CGH, the zero-order diffracted beam experiences no wavefront modification. 36. However, interference effects between the diffracted electrons still yield strong intensities at single points on each Laue circle. 37. The diffracted light can be considered to be made up of a set of plane waves of varying orientation. 38. Two rays diffracted by adjacent grooves will differ in path length by a distance " m? ". 39. The angles and intensities of the diffracted beams indicate a three-dimensional density of electrons within the crystal. 40. The acousto-optic medium must be designed carefully to provide maximum light intensity in a single diffracted beam.
