| Mixed Phase Gratings: Contribution of Refractive Index
Modulations to Diffraction Efficiency |
Sanjiva Kumar*, Amrita Debnath1, R. B. Tokas, D. V. Udupa and N. K. Sahoo
pages 36-38
DOI:10.1080/0371750X.2013.803691 |
| Abstract |
| The phase gratings have been recorded in silver halide emulsion (Slavich PFG-01) by utilizing a two-beam laser
interferometric technique and Kodak DA-163 as a developer. Such gratings are observed to conform to both the
surface relief and refractive index modulations. In the present work, we have studied the contribution of refractive
index modulations to diffraction efficiency of the phase gratings for a broad range of exposure time (30-180 s) of
recording. It has been observed that contribution of index modulation to diffraction efficiency of the gratings
increases with increasing time of exposure in the range of 30-90 s and then saturates. Contribution of relief
modulation to diffraction efficiency is also discussed.
[Keywords: Holographic optical elements, Phase gratings, Holographic recording materials, Diffraction efficiency] |
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