Bausch & Lomb (B&L) 35-53-15-78  Precision Grating, 300 Groove / mm, for Spex, Superb

This Bausch & Lomb precision grating is in a holder from a Spex 1-Meter double-monochromator. It is marked 'Left Side'. Most of the specifications were taken from the label affixed to the grating holder.

Grating size - 110 x 110 mm (ruled 102 x 102 mm)
Substrate thickness - 16mm
Focal length - infinity
Grooves / mm - 300
Blaze angle - 26 degrees 45 minutes
Catalog number - 35-53-15-78
Serial number - 884-2-6-3
Coating - Al (?)

This grating appears to be in superb condition. The grating includes the SPEX spectrometer holder as pictured. The box is also marked 3 micron.

Photo set 1663