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This document details the critical high-power optical components used in the Input Optics of the Advanced LIGO project. Key components include the Power Supply Laser (PSL), Electro-Optic Modulators (EOM), Mode Cleaners, and Isolators that enable adaptive mode matching. Objectives include achieving modulation of m>0.1 at 180 MHz, minimizing beam distortion to less than 1% at rated power (45W), and ensuring total losses below 2% while maintaining RFAM stability in-bands. These advancements contribute significantly to the interferometer's performance.
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