OPTI 599 Digital Holography
Binary Amplitude Grating:
The goal of
this laboratory exercise is to determine the degree to which your
computer generated binary amplitude grating was reproduced in
chrome-on-glass substrates.
You need to examine the following three
parameters:
I.
Grating Periodicity: This can be inferred from the
angular deviation between the 0th and 1st
order in the far field diffraction pattern.
II.
Spatial Extent: This is the area covered by your
grating on the substrate, and can be determined by measuring the
width of your 0th order spot (ensure that you are
overfilling your grating with the laser spot).
III.
Grating Duty Cycle: How wide are the slits (or,
conversely, how narrow are the lines between each slit)? This is
related to the width of the overall diffraction envelope.
For actual measurements (taken with a
profilometer) of your grating parameters, click here:
Grating Measurements
For a graphical representation of the
relationship between these parameters, click on the thumbnail below:
Administrative Notes:
