Hello every one,
In the development of optical coatings and optical filters for high and low reflection coatings.
The developed filter generates side harmonics or oscillations outside the stop band?
The reason of oscillations outside the stop band is because of following factors:
1. Mismatch of refractive index between the layers
2. Mismatch of Refractive index from the substrate to the initial layer of deposition of filter as well as final layer to outer (surrounding) media
3. In proper formation of material refractive indices and their thickness during the fabrication of the filter, Rate of evaporation during deposition
any more views
Does any one help in this query,
A simple Bragg filter coating stack of alternating high and low index films will exhibit side lobes. Is what you are referring to shown in Fig. 2 of https://en.wikipedia.org/wiki/Fiber_Bragg_grating? If so, apodization (literally, removing the foot) is possible with a more sophisticated filter recipe.
Well said David A. Ackerman sir,
I am agreed to your answer sir, the fabrication of sophisticated filters with minimizing the side lobes are very very critical tasks.
during this, one has to keep more number of parameters for both design and fabrication approach.
Thanking you sir.
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