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The sphere has an outside diameter of 80mm and is lined with a highly diffusive material. The basic idea of an integrating sphere is that light enters the sphere and is diffused to uniform power density over the interior surface. A small portion of the total power exits the sphere through a small aperture to the detector in the optical head. The sphere is used for several applications: Large beam diameter / large NA - the large size of the sphere makes a very large "target" for the optical power, allowing it to measure from a point source with NA up to 0.5 and up to a 9 mm open beam. Alignment of the emitting device or fiber to the sphere is non-critical (again because it is such a large target). The sphere, like the 81000DF, will also depolarize the signal. However, it again does this best with Fabry-Perot sources. This ability was much more important for the previous (8152x) optical heads, which had a much higher polarization dependent response. In the new 8162xB heads, the polarization dependence is already quite low and with single-line sources, such as DFB's, there will be little or no improvement in polarization dependence of the setup. More questions, please email us * 10 day DOA Guarantee by BoteQ.com * Local pick up is not offered. |