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    User name Jin Huang

    Log entry time 23:38:35 on March 01, 2009

    Entry number 264148

    This entry is a followup to: 264138

    Followups:

    keyword=JLab laser over temperature; check output; power on again

    JLab COMET laser had over-temperature tripped when I came to counting
    house. It was checked and powered on again. Full power tested for half
    hour, it seems working normally now.

    There is some dust on JLab laser jumper cable tip (the end connecting to
    long fiber). It's cleaned.

    Then, the JLab laser output power curve is tested to be normal:
    10A -> 1.18W
    20A -> 8.99W
    30A -> 17.1W
    36A -> 22.5W <= Working condition
    40A -> 25.6W

    Then the trip temperature threshold of JLab laser was increased by 1
    degree. Current trip threshold setting and diode temperature read back
    (Taux in diode controller) are:

    Laser Temp. Threshold
    JLab 27.2C 31C (increased from 30C)
    W&M 29.0C 30C
    Rugster 24.0C 27C

    Jumper fiber of JLab laser was replaced (Halog 262886) one week ago,
    which could caused diode working temperature higher than before.



    A copy of this log entry has been emailed to: yqiang, jpchen, riordan