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attoCFM III
low temperature confocal microscope, highly stable and compact
The attoCFM III is a highly stable, compact cryogenic microscope
optimized for both reflection and transmission measurements. The
attoCFM III confocal microscope is thermally compensated to guar-
antee highest stability suitable for spectroscopic measurements over
extended periods of time.
In the attoCFM III, a laser beam is coupled into the first arm of a single
mode optical fiber coupler. The end of the fiber connected to the sec-
ond arm of the fiber coupler is glued into a ceramic ferrule. The laser
light guided through this fiber illuminates the sample while the single
mode fiber itself plays the role of the blocking pinhole aperture when
collecting the scattered reflected light from the sample. The intensity
of this scattered light is measured by a detector connected to the
fourth arm of the fiber coupler. A second, low-temperature compatible
confocal objective underneath the sample is used for transmission
measurements. The transmitted light collected by the objective is
guided to an additional detector using a separate single mode fiber.
Furthermore, combining the attoCFM III with cryogen-free cooling
solutions is easily possible, opening up new possibilities in cryogenic
long-term investigations while considerably reducing operational
costs. The attoCFM III is available with interferometric encoder for
closed loop operation.
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01 LT and HV compatible feedthroughs
02 microscope insert (fiber-based optics)
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03 superconducting magnet (optional)
04 attoDRY1100 cryostat (optional)
05 ultra stable Titanium housing
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06 xyz coarse positioners
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07 xy scanner with aperture and sample
08 low temperature compatible objective
Schematic drawing of the low temperature attoCFM III
and the attoDRY1100 cryostat (optional)