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Head, Probe, & Sample Preparation
Basic AFM Operation
Rev. D Dimension 3100 Manual 111
Note: During this step do not adjust the back-right laser knob, or you may
accidentally return to the original cantilever. Only use the back-right knob
when you need to place the laser on the other cantilever.
a. Rotate the back-left laser control knob in either direction until the laser disappears and
does not reappear with an 1/8 turn.
b. Use the same back-left laser control knob to rotate the laser the opposite direction, past
the original cantilever.
c. Determine which cantilever you are on:
If the laser was on the longer cantilever at then beginning of this step, then the laser
will not cross any other cantilever legs during this movement.
If the laser was on the small cantilever, then the laser will cross the two longer
cantilever legs.
d. Select the cantilever for imaging by returning to the original cantilever, or locate the
other end of this cantilever.
10. Verify that a laser spot appears in the Dimension head filter screen. If there is not laser spot,
adjust the photodetector mirror using the photodetector adjustment knobs located on the left
side of the SPM head.
7.2.10 Adjust Photodetector
1. Now that the laser is aligned on the cantilever, verify there is a spot visible on the Dimension
head filter screen.
2. Verify there is an appropriate laser sum signal displayed on the image monitor (see Figure
7.2i). Typical laser sum values:
Contact Mode AFM: 4 - 6V
•TappingMode: 1.5 - 2.5V
Note: If the laser sum signal is low, either the laser is not aligned or the photodetector
knob needs adjusting (described in Step 3).
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