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+44(0)1795 590140 www.cairn-research.co.uk
S e t u p g u i d e
OPTO
SPLIT
II
This guide details initial set up and installation of your OptoSplit II image splitter.
Each unit is serial numbered, calibrated and QC’d prior to delivery, therefore minimal setup is required
providing you are familiar with the key controls. If you have any questions, please do not hesitate to get in
touch.
Before using the Optosplit II image splitter you will first need to install the appropriate set of filters and
beamsplitter for your application into the Cairn Filter Cube. A calibration cube with a 50% beamsplitter is
also provided for alignment or spectrally neutral applications.
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Installing Filters into the Cairn Filter Cube
The Cairn Filter Cube has spaces for two 25mm filters. These are held in place by locking rings which can be re-
moved using the tool provided. To fit a filter, remove the locking ring and place the filter orientated so that the arrow
points into the Cairn Filter Cube and towards the beamsplitter (correct for Chroma mirrors, please refer to us if
using filters from a different manufacturer). Then simply replace and tighten the locking ring.
Installing Dichroic Mirrors into the Cairn Filter Cube
To fit your dichroic mirror into the Cairn Filter Cube remove each of the four screws that secure the two halves
together. You will then be able to gently pull the two halves apart. There is one steel locating rod in each half of the
cube to ensure the correct alignment when it is reassembled. Once the two halves of the cube are seperated, place
the dichroic mirror into the rectangular recess, active face down. Then simply reassemble the cube and tighten the
screws.
Remove the four screws and separate the two halves.
Place the dichroic hold-
er in the recess and
place the spring on top.
Replace the top half and
resecure the screws.
Screws
Screws
Turn the locking
ring anticlock-
wise to remove
Carefully place the
filter inside the
recess
Replace locking
ring and rotate
it clockwise to
secure
The arrow should
be orientated into
the filtercube and
towards the beam-
splitter
Reflected path
(short wavelength)
Transmitted path
(long wavelength)
Active face arrow on
mirror to face into
* Please note: care must be taken to avoid marks or dirt being transferred onto filters and mirrors.
