Chapter 2 Before Use
2-16
Effect of Secondary Refraction on Measurement Results
The MS9740B uses a diffraction grating that outputs wavelengths
simultaneously as integer fractions. The diffraction grating outputs a
ghost harmonic wavelength at a position of twice the wavelength of the
measured wavelength.
The following figure shows an example of ghosting at the two times (1265
nm) the wavelength of a measured He-Ne laser (632.8 nm).
This ghost does not actually exist in the wavelength spectrum.
Figure 2.7-3 Ghosting Example
When measuring wavelengths of 900 nm of less, take care about ghosts at
the two times the wavelength of a measured result.
spectrum
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