Overview

• A set of phase modulation sidebands are imposed to the main laser beam for control of the mode cleaner cavity and the main interferometer. The frequency of the sidebands are determined from the signal extraction and control scheme: 11MHz, 23.5MHz, and 55MHz.
• We are investigating a multiply resonant circuit to be attached to EOM in order to create those three pairs of sidebands with a single crystal.
• (What is motivation? Why single crystal? Why three eoms are not enough? Why triple electrode EOM is not enough?)

• The feasibility and the basic ideas of the triple resonant circuit was investigated by Stephanie Erickson, a 40m SURF student in 2009 Summer. Link to Stephanie's descriptions (What did she demonstrated?)

Steps for Development

• study of LC + transformer

• investigation of loss effect

• make LC circuit with highest impedance
• make a new transformer for matching the impedance of LC circuit
• performance test by using optical spectrum analyzer
• study of triple resonance circuit
• investigation of loss effect
• make triple resonant circuit with highest impedances
• make a new transformer
• performance test by optical analyzer
• order company-qualified circuit
• performance test
• install