Flicker Noise in Quartz Crystal Resonator at 353 K as a Function of Q-Factor of Overtones and Anharmonic Modes at 4 K

The unclear physical origin of flicker noise in ultra-stable quartz oscillators is still limiting some practical metrological applications. In this paper, we study experimentally the possible correlations between Q-factor measurements at low temperature (4 K) and the level of flicker noise at nominal operating temperature (353 K). Results for 10 Stress-Compensated-cut (SC-cut) resonators with a 5 MHz resonant frequency and different noise levels (some excellent) are presented and commented, for several overtones and anharmonic modes.