LIGO Document E1200138-v1
- The ALS fiber distribution chassis splits the light picked after the PSL reference cavity into four outputs. The first output is a sample of the input beam, the other three outputs are frequency down shifted by 158.8 MHz. Each output carries about 20% of the input power. The chassis also monitors the light power injected into the fiber and the power on the PSL after the reference cavity but before it is launched into the fiber. The light is frequency shifted by a fiber-coupled AOM that is driven by a RF power amplifier at 158.8 MHz. The RF power level after the amplifier is also monitored through the slow controls system.
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