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![[Figure 8]](ay5611fig8mag.jpg)
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Figure 8
Linearity of the delay stage as measured by a laser with reduced coherence time. The black circles refer to an interference of the two beams in the fixed delay path and variable delay path. The red circles refer to the measured interferences between the beam of the variable delay path and a beam passing directly through the SDU. The additional delay obtained by bypassing the fixed delay path amounts to 14.3 ps. The covered delay range of the SDU spans between the crossed markers, allowing delays between −5 ps and 18 ps with the conventional set-up and up to 32 ps when bypassing the fixed delay path. The fit results in a slope of (2.95 ± 0.02) × 105 steps of the stepper motor for 1 ps. In the inset the residuals of the slopes are shown, which amounts to 6 fs. The error is given by the coherence length of the individual coherence signals. |
![[Figure 8]](ay5611fig8.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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