Diffraction grating with high intensity in first order

[abbas_majidi]

I'm searching for a reflexive diffraction grating with at least 1500 line per mm and high intensity in first order. Common reflexive diffraction grating don't have enough intensity for my experiment.
I need to help for getting such grating.

Thanks

 

[Andy Resnick]

These guys are the 'gold standard':

http://www.gratinglab.com/Home.aspx

you'll need to provide them with better specs (wavelengths? polarization?) to get a response.