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At the National Research Council of Canada, we are working to upgrade our cesium fountain clock. The transition from NRC-FCs1 to a second generation fountain, NRC-FCs2, requires the design and assembly of a new physics package. This work is being done in collaboration with the National Physical Laboratory UK (NPL), and is based on their newest fountain, NPL-CsF3. We will describe the status of this...
An uncertainty evaluation of NRC's cesium fountain clock FCs1 is currently being performed. One task of this evaluation consists in quantifying the contribution to the frequency uncertainty, the second-order Zeeman shift. We report the results obtained from measurements of the C-field above the Ramsey cavity using the Larmor frequency as a probe. This technique is possible because a transverse C-field...
Using pump-probe measurements, we characterize carrier decay time inside fused silica and measure deeply bound self-trapped excitons. With pump-probe delay, we also control free carrier injection and the subsequent avalanche process for laser machining applications.
We show experimental evidence for cold avalanche and demonstrate how it can be distinguished from the traditional avalanche process. We analyse the nonlinear absorption of 800 nm, ultrashort pulses focused inside fused silica glass to study the ionization mechanisms. The light is focused tightly inside the glass using a microscope objective so as to avoid surface damage and self phase modulation....
Using the unique characteristics of multiphoton ionization with focused femtosecond pulses, we report on a pump and probe metrology to analyze carrier dynamics inside dielectrics. We characterize the sub-picosecond trapping of carriers inside fused SiO2.
By repeated optical breakdown with focused femtosecond pulses, we decrease the refractive index of fused silica by few percent. The subsequent micro-lens formation is associated with a reduction of multiphoton absorption in all dielectrics.
We show a reduction in the ionization threshold at previously ionized regions inside transparent solids. This forms a shot-to-shot memory that can lead to several unique nonlinear phenomena including the formation of nanostructures.
We resolve attosecond dynamics of multiphoton ionization in solids. We subdivide the laser cycle using differential absorption between the major and the minor axes of elliptically polarized beam.
We quantified the NF penalties on combined C and L band transmission, arising from pump FWM in distributed Raman amplifiers. Experimental results demonstrate the elimination of the problem by synchronous modulation of the Raman pumps.
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