Clio2 User Manual

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    HistoryEdited Jan 7, 2012 9:41 AM by Phil Hinz…

    Filter Information

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    Filter Wheels

    There are two filter wheels in Clio placed just after the pupil stop. Each wheel is capable of holding 8 one inch filters. The depth of the receptacles is approximately 0.33 inches. As of October 2010 the filter wheels contain the following filters. Listings below are listed in clockwise order from the home position, as seen from filter wheel 1.

    Wheel 1
    1. Open (home)
    2. MKO M’
    3. Barr M
    4. Direct vision prism (narrow edge toward cold plate)
    5. 3.1 um filter (JDSU N03095-8E)
    6. Barr L’
    7. 3-5 um Janostech (home)
    8. Blocked

    Removed 11/20/08:Polarizer (Meadowlark Stock# C001151 Part# VL-100-IR-R)

    Wheel 2
    1. 3.3 um filter (JDSU W03311-6E passband 3.12-3.53 um)
    2. 0.1% transmissive ND (Janostech P/N FX90-0099)
    3. ?? 1% transmissive ND (Janostech P/N FX90-0098)
    4. Open
    5. 3.4 micron filter (JDSU N03401-6E)
    6. 3.9 micron filter (JDSU N039042-8E)
    7. Barr Ks+uncoated 5mm thick BK7 window
    8. Barr H + Thorlabs AR-coated 5mm thick BK7 window


    The associated text files for the filter transmission curves are in this tarball:

    Download file "clio_filters_v3.tar.gz"

    In Fall 2008, a 3.1-3.5 micron filter was added:


    Around the same time, an Ice band filter was added: