© 2011 Thorlabs
9Getting Started
2.4.2
Filter Wheel
The Thorlabs BC106 Camera Beam Profiler is equipped with a filter wheel
containing four different neutral density (ND) optical attenuation filters. The filter types
and its nominal losses are model dependent. These filters are designated for a
quick and easy adaptation of the light source power (which may exceed the
saturation power of the camera) to a power level within the dynamic range of the
CCD camera. The following image shows the BC106-UV filter wheel.
The following table gives you an overview:
1x 20 dB UV, reflective
1x 20 dB VIS, absorptive
1x 40 dB UV, reflective
1x 40 dB VIS, absorptive
1x 10 dB VIS, absorptive
1x 20 dB VIS, absorptive
1x 30 dB VIS, absorptive
1x 40 dB VIS, absorptive
Model BC106-VIS is equipped with four absorptive neutral density (ND) filters made
from glass, that's why they are applicable only for the visible and near infrared
wavelength range 350 - 1100 nm.
Model BC106-UV offers a wavelength range of 190 - 350 nm and therefore is
equipped also with reflective filters made from fused silica. Two absorptive filters are
similar to the VIS model and two filters for the UV are added. Because these filters
are AR coated they are only applicable for the UV range (220 - 350 nm). See
chapter Wavelength Response for detailed data.
Attention
Be sure to have selected the appropriate ND filter corresponding to the
actual operating wavelength! Keep attention to the light reflected from
reflective UV filters!
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