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When a femtosecond laser is servoed onto an ultra-stable cw laser, its repetition rate acquire an extreme spectral purity. By photodetecting the pulses, we are able to generate ultra-low phase noise microwave signals and use it for cutting edge metrology experiments. We present our past and present work to generate microwave signal with very low degradation from the limit imposed by the reference...
Low-phase-noise and stable microwave signals are of prime importance in a variety of scientific and technological fields, such as, for example, atomic frequency standards1,2, radar and remote sensing, and very long baseline interferometry. The combination of ultra-stable lasers 3 and low noise optical frequency division by use a femtosecond laser presents a possibility to realize extremely low phase...
We present our results on optical to microwave frequency division by fiber-based optical frequency combs. The phase noise added by the division process is characterized and several noise reduction strategies are demonstrated. We reach -123dBc/Hz at 1Hz from a 11.55GHz carrier and about -130dBc/Hz above 200Hz Fourier frequency. The fractional frequency stability scales as 1.1×10-16τ-1T where t is the...
We report on our fiber-based mode-locked laser approach to the generation of ultra-low noise microwave signals, and its use for frequency metrology. We make use of two erbium fiber mode-locked lasers phase locked to a common ultra stable laser source to generate an 11.55 GHz signal with a relative phase noise of −111 dBc/Hz at 1 Hz from the carrier. The corresponding residual frequency instability...
We demonstrate the use of a fiber-based femtosecond laser locked onto an ultrastable optical cavity to generate a low-noise microwave reference signal. Comparison with both a cryogenic sapphire oscillator (CSO) and a titanium-sapphire-based optical frequency comb system exhibit a stability of about 3 times 10-15 between 1 and 10 s. The microwave signal from the fiber system is used to perform Ramsey...
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