The 74061 MS260i Triple Holographic Grating Assembly is mounted in an individual, prealigned mount. Simply drop it in place, and program the grating specifications into the MS260i through the Control/Utility Program or Hand Controller. This grating assembly has a 1800 l/mm line density and has a peak efficiency of 65% at the 500 nm Blaze Wavelength. It's efficiency exceeds 20% over the 300 to 925 nm primary wavelength region. 925 nm is the MS260i's upper wavelength mechanical limit for this grating assembly. You can add and change gratings in the field without changing the instrument’s grating turret. Users who wish to reconfigure their instrument from dual gratings to triple gratings (or visa versa) should contact Newport or their regional sales representative for more information.