The photo collage shows the key features of the DGA-25 and DGA-50.

Top Left - Mounting for 25x25, 25x50, or 50x50-mm gratings. Newport now sells 25x25, 25x50, and 50x50-mm gratings which are compatible with both the DGA-25 and DGA-50.
Top Right - Not two, but three axes of adjustment: θx, θy, θz. Use pitch and yaw for beam alignment, use roll to set the grating lines. All adjustments are lockable.
Bottom Left: CenterPoint™ post mounting which locates the surface of the grating on the rotation axis of the mounting post.
Bottom Right: In addition to diffraction gratings, the DGA-25 and DGA-50 can hold 1” and 2” beam splitting cubes respectively, right angle prisms, and square mirrors.

Model: four-axis-diffraction-grating-mount