Parametric regeneration in ferroelectric resonators

Parametric excitation of temperature oscillations in a high-Q dielectric microwave resonator in liquid helium vapor

“…In our calculations, we used the following material constants for the resonator made of KTaO 3 : thermal conductivity κ = 0.07 W/(cm·K) [20,21], heat capacity C p /T 3 = 14.8 · 10 −7 J/(g·K 4 ) [22], Q-factor Q f = 1.5 · 10 4 [23], ε 0 = 4.3 · 10 5 [24], a ε = 5 · 10 −3 K −1 [23], r 0 = 0.5 mm, and ρ = 6.97 g/cm 3 [23]. Figure 1 shows the results of calculating the thresh- old power of the excitation of temperature oscillations for different variants of mode interaction in the form T ms nsls -H ma nala -E ma (na+1) la as functions of the mode number n a .…”