The oven top is removable using a 2mm hex driver to
take out the two retaining bolts (or four in the case of
the PV40). Then slide the top in the vertical direction to
remove the insulation and expose the heater (shown in
figure 1). The PPLN Clip sits on top of the heater,
locating on the dowel pins. When installing a PPLN Clip
ensure that it is safely located on the dowels, and is
sitting flat on the heater thus ensuring maximum heat
transfer to the clip (shown in figure 2).
When replacing the oven top, check that the recess for
the cable is on the correct side. It must also be ensured
that the spring pins, which push the clip onto the
heater, locate properly and will not be damaged as the
top is pushed on. As the oven top is relocated gently
push down towards the heater and tighten the retaining bolts (shown in figure 3). Do not use
excessive force to tighten the retaining bolts, otherwise thread damage may occur making it
impossible to fasten the oven top.
The PPLN oven can be operated in a number of different configurations, which through the
removal of insulation allows increased access to the PPLN crystal, however a decrease in oven
efficiency and stability will occur. The oven can be operated without the oven top in place, this can
be achieved by following the removal procedure outlined above. If greater access to the PPLN
crystals optical facets is required, then the end plates of the oven can be removed. The end plate
is removed by using a 1.5mm hex driver to take out the three retaining bolts. When replacing the
end plates, a similar degree of care must be taken as is associated with the removal and
replacement of the oven top, excessive force applied to the retaining bolts may result in damage
to the oven.
The oven can therefore be operated in one of four configurations; fully insulated (recommended),
top off only, end plates off only, and top and end plates off (all configurations shown in figure 4).
Care must be taken not to touch hot components when the PPLN oven is operated in any state
other than the recommend fully insulated configuration.
The PPLN oven utilises a 12-24V 3.6-15W element and a PT100 resistance temperature sensor,
which are cabled and connected to a plug for convenient connection to the OC2 temperature
controller. The variable power rating of the heater allows the heating characteristics to be tailored
to the specific oven being using, for example 3.6W produces stable operation for a fully insulated
PV10 (oven suitable for crystals of length 10mm and below) but for an uninsulated PV40 (oven
suitable for crystals of length 40mm and below) up to 15W may be required in order to produce
suitable operating parameters. The PPLN oven offers a stability of ±0.01
C, when used with
email: [email protected]
tel: +44 (0)1794 521 638
web: www.covesion.com
fax: +44 (0)8709 289 714
email: [email protected]
tel: +44 (0)1794 521 638
web: www.covesion.com
fax: +44 (0)8709 289 714
Figure 3. Oven top replacement
Figure 4. Oven configurations
version 2.0/2015
