Remember the placid field in the post "The Placid Field" dated 29 Jul 2016 and the post "Just A Strobe Light" dated 27 Nov 2017, where time particles have a resonance frequency,
\(f_{\psi}=3230699.3\,GHz\)
It is possible to get close to this frequencies with a non-aliased square wave at \(f_T=3230.6993\,Hz\).
The second mirror is to avoid a reflected being.
Good luck.
