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attoCFM III
low temperature confocal microscope, optimized for transmission measurements
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The attoCFM III is a highly stable, compact cryogenic microscope
optimized for reflection and transmission experiments. The attoCFM
III confocal microscope is thermally compensated and guarantees
stability
for spectroscopy over months. It opens up new possibilities in
quantitative sub-micron range investigations and routine inspection
in extreme environments: temperatures down to 0.3K, magnetic fields
up to 15T, and high vacuum. The one-of-a-kind combination of materials
allows absolutely stable single quantum dot measurements at low
temperatures over long period of times, even when refilling the
bath cryostat with liquid Helium. The adjustable transmission mode
operation integrated in the instrument is absolutely unique in
low temperature microscopy!
Principle - The schematic drawing to the left illustrates the attoCFM III
confocal microscope. A laser beam is coupled on the first arm
of a 50/50 single mode optical fiber coupler. The fiber end of the
second arm is placed in a ceramic ferrule. This single mode fiber
illuminates the sample and 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 (Detector
1). The second detector is used to monitor the laser source.
A second confocal objective is used for transmission measurements.
The transmitted light is measured by Detector 3.
Objective Systems - Three different objectives are available as
described in the section ‘low temperature objectives’.
An increase of the numerical aperture by a half ball sapphire
lens is possible, thus leading to an increase in resolution to
150 - 300 nm (with red laser light illumination).
Request Quotation & Support : |
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Available
Controller for this Product:
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SPM controller
with xy-scan generator incl. feedback control und fully digital
phase locked loop (PLL)
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Piezo step controller for coarse
positioning | 1, 3 or 6-axes control | Optional: TFT-display,
TTL-input |
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Piezo scan
controller for ultra high resolution scan |
1 to 6-axes control
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Complete
System Solutions:
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Complete system
configurations for this product. |
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| Reflection (top) and transmission (bottom) image of
a Cr on SiO2 grating with a period of 10 µm recorded
with the attoCFM III. |
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