  We present a new flexible high speed laser scanning confocal microscope and
its extension by an astigmatism particle tracking device (APTV). Many standard
confocal microscopes use either a single laser beam to scan the sample at
relatively low overall frame rate, or many laser beam to simultaneously scan
the sample and achieve a high overall frame rate. Single-laser-beam confocal
microscope often use a point detector to acquire the image. To achieve high
overall frame rates, we use, next to the standard 2D probe scanning unit, a
second 2D scan unit projecting the image directly on a 2D CCD-sensor (re-scan
configuration). Using only a single laser beam eliminates cross-talk and leads
to an imaging quality that is independent of the frame rate with a lateral
resolution of 0.235\unit{\mu m}. The design described here is suitable for high
frame rate, i.e., for frame rates well above video rate (full frame) up to a
line rate of 32kHz. The dwell time of the laser focus on any spot in the sample
(122ns) is significantly shorter than in standard confocal microscopes (in the
order of milli or microseconds). This short dwell time reduces phototoxicity
and bleaching of fluorescent molecules. The new design opens further
flexibility and facilitates coupling to other optical methods. The setup can
easily be extended by an APTV device to measure three dimensional dynamics
while being able to show high resolution confocal structures. Thus one can use
the high resolution confocal information synchronized with an APTV dataset.
