Pre-Stabilized Laser Table 2
In this panorama you see the pre-stabilized laser (PSL) table from the opposite side compared to the "Pre-Stabilized Laser Table 1" panorama. Very apparent in this view are the red hoses that carry chilled water to the laser to regulate the temperature of the lasing elements. To the left of the hoses sits the high power amplifer in the large gray case. At the level of the table to the left of the amplifier, note the red cable shield that encases two black cables. Zoom in for a closer view. These cables hold the optical fiber bundles that carry 808nm pump light from a room dozens of meters away. You can see two fiber connection ports at half-height on the gray case. Two more lie on the opposite side of the amplifier, out of view.
On the left side of the table there appears a coil of yellow-jacketed optical fiber. Zoom in and you'll see a fiber entry port where a portion of the reference cavity beam enters the fiber. The light collected by the fiber is used as a frequency reference for LIGO's arm length stabilization system that brings the long arms of the detector into resonance apart from the interior of the interferometer.