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222 6 Answers, Hints and Solutions
A4.3 See Fig. A.11.

8,000
Rotation rate (rpm) 6,000 2r=2 mm 3 mm

4,000
2,000
4 mm
0
1.4 1.5 1.6 1.7 1.8 1.9 2.0
Refractive index
Fig. A.11. Rotation rate dependence on refractive index of cylindrical optical rotor
with slope angle of 45 ◦

A4.4 See Figs. A.12 and A.13.

1,600

1,500
Rotation rate (rpm) 1,400

1,300
1,200
a =45
1,100
0 30 60 90
Start angle (deg)

Fig. A.12. Relationship between rotation rate and starting angle α of the slope.
The span of the slope forms from α to α +90 ◦