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Problem #1:
"RI-Library not found" problem reported in the PCGrate-S(X) v.6.0
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Problem #2:
"Efficiency difference of 1st & -1st orders of lamellar grating operating at normal incidence" problem reported in the PCGrate-S(X) v.6.1
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Problem #1:  
 
My problem is described as follows. I would like to make a wavelength scan using the refractive indices from the library. I made the following settings: General/Light and optical geometry/Wavelength: 500nm; Scanning options: Scan range 1 = 500:10:700 nm; Refractive Index From library: Al_Palik.RI. When I ran the "Check" option I always got the message "RI-Library not found". I browsed through the RI folder and tried selecting one file after another. I tried *.ri files and *.ari files (after making them show up in the browse list). No matter what file I tried, calculations were performed only with the refractive index for 500nm but not according to the actual wavelength range.  
 
I tried to uninstall and install the PCGrate once more. But when I select an index from the file, then the code cannot find the file. I can use the RI Editor and find the files, but then the PCGrate will not find them. How can I make the PCGrate find this library?  
 
Possible reasons and their elimination:  
 
This is a fairly serious problem apparently connected with some additional software installed on the client's PC. Occasionally the problem may be resolved by reinstalling the Windows® operating system. In your specific case, the problem was fixed by changing the type of HASP® key and uninstalling/reinstalling the PCGrate-S(X) v. 6.0 software.  
 
IMPORTANT NOTE:  
At the present time we implemented a special PCInfo tool into the PCGrate-S(X) v. 6.1 program. This tool enables one to collect information about registry keys, directories, crash reports, log files and computer configuration. As to the PCGrate-S(X) v. 6.1 software, we are not aware of any problem of this kind.  
 
 
 
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Problem #2:  
 
We have made a simulation of a symmetrical phase grating operating at normal incidence, and the efficiency in the 1st and -1st orders is different (0.42 and 0.32). What is the reason for this? I used the "normal" calculation mode and the "finite" type of low border conductivity.  
 
Possible reasons and their elimination:  
 
This discrepancy is not an error inherent in the method promoted or in the programming as such but is due to a singularity effect which develops on edges or on steep facets. We have substantially accelerated the convergence of the method for such situations through the use of some refinements of the solution at the points responsible for divergence of the results.  
 
IMPORTANT NOTE:  
This discrepancy does not appear in the updated PCGrate-S(X) v. 6.1 program (a release of 05/03/2005).  
 
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