Figure 10
Sequence of CCD pictures showing the motion of the interference fringes of the 2.6° lucite wedge. The integration time for each picture was 1454 ms. The sequence was taken approximately 110 min after the beginning of a 1 h upward ramp of the piezo voltage; after the upward ramp ended, the voltage was maintained at its maximum value. The black dot represents the same fixed point within the beam in all four pictures. The arrow points to one of the bright fringes. Note the movement of this bright fringe from right to left relative to the black dot. |