Hi Janmejaya,

Thank you for your post!

It looks like the Thorlabs Echelle Gratings is a low period reflective grating of rectangular shape. And Thorlab does provide the Blaze angle for different gratings. In this case, you could probably use a User Defined Object type and model the grating behavior using one of the DLLs provided with OpticStudio intallation, 'srg_blaze_RCWA.dll'. Please note that these RCWA dlls are only available for users with Premium Subscription license type. 

There is a KBA describing how to set this up in OpticStudio, 'Simulating diffraction efficiency of surface-relief grating using the RCWA method' at https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01898 

Best regards,

Hui

Hi Janmejaya,

Thank you for your reply! 

If you do not have access to this 'srg_blaze_RCWA.dll', then it's going to be diffucult for you to model the exact shape, for example the blazed angle, of this particular grating. There is a Diffraction Grating object provided in OpticStudio. Or you can use Lenslet Array 1 object which also allows you to define the diffraction property based on grating period. The only thing is that you won't be able to model the exact blazed angle shape of the grating lines and the diffraction efficiency associated with it. 

You can find a description on how to use Lenslet Array 1 at The Setup Tab > Editors Group (Setup Tab) > Non-sequential Component Editor > Non-sequential Geometry Objects > Lenslet Array 1

Best regards,

Hui