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Lock Acquisition
Lock acquisition scheme has to be planed carefully because it was a big problem in the first generation large-scale interferometers.
Probabilistic lock (a.k.a. lucky lock) won't probably work. Other locking schemes such as the arm pre-locking has to be considered.
Auxiliary Lock System
Also known as green laser lock, this scheme will make use of auxiliary lasers to lock the arm cavities first.
Oscillator phase noise requirement for PLL local oscillator
See here.
Overview of Green Lock Scheme
