LIGO Document E1000061-v2
- The harmonic generator takes the main modulation frequency and produces the 5th harmonic which serves as the second modulation frequency. It also generates the second and the tenth harmonic for measuring the power in the RF sidebands. It generates the sum and difference of the two modulation frequencies at the forth and sixth harmonic. Locking the interferometer also requires both third harmonics at the third and fifteenth harmonic. The harmonic generator should preserve the phase noise of the original oscillator. The degradation in phase noise is typically linear in the harmonic order.
- Reduce input frequency range.
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