Mounted ZnSe Lenses 1.5″ Diameter
ZnSe lenses of meniscus form and of 1.5″ (38mm) diameter are supplied in two main types: ’15ZLF’ series,
with 3.0mm edge thickness and suitable for use up to 5 Bar gas pressure; ’15HGP’ series with 6.2mm edge
thickness and suitable for use up to 25 Bar gas pressure.
Some 1.5″ diameter lens types have other edge thicknesses…see lens data sections.
All types may be accomodated in the ULO Optics standard ‘M15’ mount.
Mounted lenses are designated as follows:
Mounted 15ZLF lenses become ’15MZLF’ type.
Mounted 15HGP lenses become ’15MHGP’ type.
Technical specifications, M15 mount
Material : Aluminium HE30
Finish : Black anodised
Identification : Self-adhesive title ring (standard FLs)
Thread : 44.0mm dia x 1.0 pitch x 16mm long
Max. diameter : 54.0mm
Overall length : 28.0mm
Clear aperture : 35.0mm
Dimensions : See fig. 8.23
All mechanical dimensions are toleranced to +/-0.1mm, except the mounting thread.
The mount thread is deliberately made to be a slightly loose fit into a female thread of (full) M44.0 x 1.0 size.
(Users making a female thread to be a smooth or tight fit to an example lens cell run the risk of subsequent
failure-to-fit with lens cells from other suppliers, or due to batch-to-batch variations).
The mounting method for ’15ZLF’ lenses is shown in fig. 8.21.
Fig. 8.22 showns the mounting/sealing method used for ’15HGP’ lenses. Note that indium wire is not used for
high gas pressures as ‘creep’ can occur under those circumstances.
The T-slot ring used with 15ZLF lenses avoids excessive clamping pressure.
See figure 8.23 and table 8.24.
The numerical designation of the lens represents the FL in mm.
Example: 15MZLF95 has 95mm (3.75″) focal length.
Note *: use this item to 3 Bar only.
The M15 mount fits directly to the following products:
WMB water cooling mount (sections 9.70, 21.3)
FF38 focus mechanism (section 63.4)
CFF38 focus mechanism (section 63.3)
and special variants of MBE beamexpanders (section 67.7), available
on request only, adapted to accept the M15 mount.
The MNA nozzles are compatible with 1.5″ diameter mounted
lenses. See section 9.20.
MNA nozzles do not attatch directly to the M15 mount, but interface
via model WMB water-cooling mount (section 9.70)
Some products (FF38, CFF38) can be supplied to accept the M15
cell and the MNA nozzle without requiring the WMB interface as a