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The length of the DTG^®s can typically become tuned between 1mm and 10mm. However, it needs to be noticed that this length is also affecting the Reflectivity of the DTG^® as well as the Full Width Half Maximum (FWHM) of the reflection peak of the DTG^®. The figure below shows a typical relationship between the DTG^® length at one side and the reflectivty and FWHM on the other side. As can be seen, the shorter the length, the lower reflectivty and the higher the FWHM. Our standard DTG^®s have a typical length of 8 mm resulting into a guaranteed reflectivity >15% and FWHM of about 100pm.