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attoMICROSCOPY
Confocal Microscopy (CFM) - fiber-based setup
fundamentals
While the free-beam based attoCFM I offers
a maximum amount of flexibility (see previous page and page 42), its fiber-based
counterparts attoCFM II and attoCFM III
offer ultimate long-term stability.
attoCFM II
The key feature of this system is its unprecedented stability allowing long-term investigations over many weeks without readjustmen. This can become crucial when
working with single photon emitters (e.g.
quantum dots), and when tuning several
CFM III
ASC400
ASC400
ASC400
1
3
This is the system of choice for customers
who are working with transparent samples
in transmission mode. Here, the confocal
microscope essentially consists of two separate attoCFM II: one single-mode fiber for
excitation, and one separate fiber and low
temperature objective for detection. Using
two different single mode fibers for the two
optical paths enables access to a larger and
more flexibel wavelength range than with
the attoCFM II.
A single-mode fiber is used for both
excitation as well as detection, sharing
the optical path all the way from the fiber
coupler inside the laser detector module
(LDM600), down to the low temperature
objective, onto the sample, and back up to
the detector. The accessible wavelength
range for both the excitation and detection is thus limited by the range of the
single mode fiber used.
CFM II
LDM 600
attoCFM III
external parameters (like magnetic field or
gate voltage) over long periods.
2LDM 600
1
03
2 LDM 600
3
LDM 60