1.1. QUICKSTART MANUAL
1.1.2 Starting up
waveplate and
magnetic interlock
longpass filter
(pump block)
slot for alignment plate
pump and source
beam folding
mirror
polarizer in
rotation mount
longpass filter
fiber coupler
polarization maintaining
longpass filter
fiber
Be careful NOT to move the adjusting knobs of the mirror mounts and the ber
couplers when unpacking the breadboard!
Plug the bers into the quCR control unit.
Connect the Laser unit to the quCR control unit using the included SUB-D9 cable.
Make sure the half waveplate is unpacked and inserted into the beam path properly.
You can access the waveplate by removing the small round cover in the white source
enclosure. Please note that removing the cover will activate the safety interlock and
shut o the laser, if it was turned on.
Make sure the polarizers are both inserted securely in the two beam paths of the
optical setup. If you have the motorized version, please note that the third motor
position in the left beam path of the quED can only be used by a horizontally
mounted motor! Vertically mounted motors can only be xed in the other two
positions.
Probably the system will have to be slightly readjusted. For this purpose, set both
polarizers to
45
◦
and the integration time to 0.1 s. Keep the laser diode covered
under the white housing and turn on the laser. Set the operating current specied
in the inspection data sheet.
A small coincidence rate should already be visible. Otherwise, you have to refer
to the complete alignment procedure in the operation manual. Make sure, the
coincidence rate is not comprised of accidental coincident events only. A rate of a
few hundred per second is usually ne and enough to start with.
quED Manual V2.0 Page 4