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Filters

  There are four filter slots on the Fiber Module. The first slot (A) holds aperture masks and is not currently used; the second slot (B) holds thick (0.35 in) filters (the interference filters for the Echelle grating); the other two (C and D) hold thinner (0.25 in) filters (the glass filters). Hence, it is possible to use a broad-band glass filter in concert with another glass filter or with an interference filter for maximal blocking.

A list of available filters for order separation is given in Table 3.

  
Table 3: List of Bench Spectrograph filters.

In that Table, LP stands for longpass, BP for bandpass. ``-" and ``+" are the half maxima. Transmission curves for the available filters are shown in Figures 3 and 4.

  
Figure 3: Transmission curves for the available glass filters. Note the red leak in the G6 filter. The glitches at 8600 Å are artifacts from the scanning process.

  
Figure 4: Transmission curves for the interference filters.