It consists of three beam splitters in Laue diffraction into two coherent beams, a reference beam which remains undisturbed and a beam passing through the sample.
32.
Reading would be done with the reference beam since the electrons can no longer be excited out of the deep traps by the long wavelength beam.
33.
The reference beam intensity is taken as 100 % Transmission ( or 0 Absorbance ), and the measurement displayed is the ratio of the two beam intensities.
34.
During reading, the action of the reference beam and the stored interference pattern in the medium recreates this data beam which may be sensed by a detector array.
35.
This is a phase grating and it can be shown that when such a plate is illuminated by the original reference beam, it reconstructs the original object wavefront.
36.
At detector 2, in the absence of a sample, the sample beam and reference beam will arrive with a phase difference of half a wavelength, yielding complete destructive interference.
37.
The reference beam is expanded and made to shine directly on the medium, where it interacts with the light coming from the subject to create the desired interference pattern.
38.
By shifting the frequency of the reference beam, the lowpass filter becomes a bandpass filter centered at the detuning frequency, and selective narrowband detection and imaging can be performed.
39.
Stetson put forth the idea that each mode existed in both the object and in the reference beam, and each pair recorded a separate hologram in the photographic plate.
40.
After being perturbed by interaction with the sample under test, the sample beam is recombined with the reference beam to create an interference pattern which can then be interpreted.
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