1. These have good low frequency specs., and the negation of
    having to have electricity or air, is a bonus in some applications.
    I still use air suspension for my low frequencies and then an interferometrically feedback controlled piston/servo/piezoelectric combo, for the higher frequencies.
    Finally then… I modelock my fringes, and use two photon injection to each cavity, through a distributed
    phase matcher. I guess my requirements are a little bit different than the norm?

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