4 PREPARATION FOR OBSERVATION
4.2 ADJUSTMENT FOR AFM OBSERVATION
Below are the procedures for adjusting the laser beam and the photodiode in the AFM
head unit and for roughly approaching the specimen.
4.2.1 Adjusting the Laser Beam Position
Turn on the SPM CONTROL unit according to the procedure of Section 5.3.1, "Starting
the System in Measurement Mode."
1.
Turn on the LD-ON switch on the AFM amplifier unit.
The switch lamp lights and the laser beam will be emitted.
2.
Adjust the laser illumination position adjusting knobs so that the laser beam
illuminates correctly the tip of the cantilever while watching the illumination
position through a CCD-mounted optical microscope.
A Class 2 laser is used in this microscope. Do not look directly
in the observation instruments such as the optical microscope.
Look in the observation instrument indirectly by using a
detecting device with CCD.
WARNING
Be careful not to get irradiation bombardment from the laser
radiation aperture locating near the laser source position
adjusting knobs.
WARNING
CCD-mounted
optical microscope
4-10
TMPM5200-2