We’ve read a lot about oscillators, but crystal oscillators seem to be a bit of a mystery. Hobby-level books tend to say, build a circuit like this and then mess with it until it oscillates.
Optical parametric oscillators (OPOs) are convenient sources of coherent light that suit numerous scientific applications, including various types of spectroscopy, multiphoton excitation ...
One emerging technology is macroscopic mechanical oscillators, devices that are vital in quartz watches, mobile phones, and lasers used in telecommunications. In the quantum realm, macroscopic ...