Noise Suppression with Cryogenic Resonators

Abstract

We show that fast technical fluctuations of microwave signals can be strongly suppressed by cryogenic resonators. The experiments were carried out with sapphire resonators cooled to approximately 6 K at frequencies around 11 GHz. Each sapphire crystal was shaped like a spindle with the rotational and crystal axes aligned within a degree. Noise suppression factors in excess of 50 dB were measured at 10 kHz offset from the carrier. This was achieved by rotating the sapphire spindle and moving the coupling probes relative to its surface. Microwave signals with reduced fast technical fluctuations allow the high-precision tests of fundamental physics, as well as the development of better radars.

4 pages, 7 figures

References in corpus (8)

• 1.5 $\mu$m lasers with sub 10 mHz linewidth
• Photonic microwave signals with zeptosecond level absolute timing noise
• 8E-17 fractional laser frequency instability with a long room-temperature cavity
• Coherent Optical Clock Down-Conversion for Microwave Frequencies with 10-18 Instability
• Searching for Scalar Dark Matter via Coupling to Fundamental Constants with Photonic, Atomic and Mechanical Oscillators
• Optimizing the linearity in high-speed photodiodes
• Microwave Phase Detection at the Level of $10^{-11}$ rad
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Cited by in corpus (5)

• Frequency Stable Microwave Sapphire Oscillators
• Power-to-Frequency Conversion in Cryogenic Sapphire Resonators
• Amplitude Noise Cancellation of Microwave Tones
• Microwave Cavity Mode Optimisation by Background Anti-Resonance Tuning
• The Study of Thermal Fluctuations in Microwave and Mechanical Resonators