VPH Gratings

N.B. Both 740 l/mm and 3300 l/mm VPHGs have more strongly-peaked blaze functions than the SRGs, however, the VPHG diffraction efficiencies are still greater than the SRG efficiency at the edge of the Bench band-pass.

740 l/mm
Predicted performance with the STA1 CCD:


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3300 l/mm (Not available until 2008B semester)


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