Cryocooled dielectric crystal whispering-gallery mode resonators and their application to ultra-stable frequency generation

Nitin Nand

    Research output: ThesisDoctoral Thesis

    454 Downloads (Pure)

    Abstract

    [Truncated abstract] Very long baseline interferometry is advancing towards higher frequencies to increase angular resolution to enable high quality deep space imaging. But observations become increasingly challenging as the wavelength becomes short. VLBI at millimeter wavelengths (mm-VLBI) suffer from low sensitivity due to instrumental noise and atmospheric effects which reduce phase coherence time. To increase coherence, a local oscillator frequency standard with noise performance much better than the currently used H-maser is required, provided weather conditions are good.

    This thesis presents the development and noise characterization of a cryogenic sapphire oscillator (CSO) based on a cryocooler (cryoCSO) and frequency synthesizer (FS). These two prototypes are capable of delivering ultra-low phase noise and ultra-high frequency stability references suitable for mm-VLBI.

    Original languageEnglish
    QualificationDoctor of Philosophy
    Publication statusUnpublished - 2014

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