The details of the construction of the Raman spectrograph are given on
this page. The parts list with manufacturer name and part numbers are
reported on the table below. This spectrograph can be assembled with
commercially available components as seen on the photographs below. The
only thing to build is the cabinet, home made with black polyethylene
To mount the optical components I used an optical breadboard
manufactured by Thorlabs. This board greatly facilitates the positioning
of the components and allows easy modifications for testing purposes. It
is rigid and thus maintains quite well the position of the optical
parts. It is worth the expense !
The grating is mounted on a very stable rotation stage from Edmund
optics with a kinematic mount and holder for an easy adjustment of the
The entrance slit assembly is fixed on a rigid plastic panel secured at
90° of the breadboard with precision right angle brackets. The
collimator is mounted with post and post holder as shown. A baffle is
installed in front of the collimator to prevent the overloading of the
entrance optics by the reference neon light which enter the spectrograph
with a cone angle wider than f/8.
The Olympus OM 135mm lens is mounted on the camera with an adapter OM
bayonet to T2 thread.
To prevent spurious light coming into the spectrograph, the bottom of
the breadboard and the corners of the case are covered with black tape.
A black plastic cover is secured on top with long treaded rods and thumb