Adjusting The Optical Cantilever Deflection Detection System - NT-MDT NTEGRA Spectra Instruction Manual

NTEGRA Spectra Probe NanoLaboratory. SNOM Measuring Head. Instruction Manual
3.8. Adjusting the Optical Cantilever Deflection
Detection System
Adjusting the optical cantilever deflection detection system can be performed in one of
two ways:
−
by the spotlight from the illuminator;
−
by laser beam coming from the spectrometer.
In both cases, the adjustment procedure is the same. So, only adjustment with the
illuminator is described below.
1. Watch the probe and move it with the screws 1 and 2 (see Fig. 3-19) to the position
where the light spot appears on the probe chip (pos. 1 in Fig. 3-20).
a)
1, 2 – screws for X and Y positioning of the probe;3 – screw for fine focusing of the lens;
4, 5 – screws for positioning of the photodiode; 6, 7 – screws for X and Y movement of the lens
2. Using the screw 1 move the probe away from you, thus moving the light spot to the
edge of the chip (pos. 2 in Fig. 3-21), until a specific image appears on the monitor of
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Fig. 3-19. Adjusting elements of the detection system
Fig. 3-20. Aiming the laser spot at the cantilever
b)