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We use the three-cornered-hat method to evaluate the absolute frequencystabilities of three different ultrastable reference cavities, one of which hasa vibration-insensitive design that does not even require vibration isolation.An Nd:YAG laser and a diode laser are implemented as light sources. We observe$\sim1$ Hz beat note linewidths between all three cavities. The measurementdemonstrates that the vibration-insensitive cavity has a good frequencystability over the entire measurement time from 100 $\mu$s to 200 s. Anabsolute, correlation-removed Allan deviation of $1.4\times10^{-15}$ at 1 s ofthis cavity is obtained, giving a frequency uncertainty of only 0.44 Hz.

A vibration-insensitive optical cavity and absolute determination of its ultrahigh stability