Special group seminar: Controlled Frequency Generation for Grey Molasses Cooling

Alexandra Beikert, University of Heidelberg
Group Seminar via video conference (Zoom)
Wednesday, August 18th, 14:00 pm (MEZ)

Due to the Covid-19 pandemic, we are now holding our group seminars and journal clubs via video conference.This procedure enables us to continue our research, enhance discussions and exchange important information.
 

Abstract: 

In this talk I will present the design and implementation of two approaches to generate stable frequencies, the sum of which is kept constant. The first approach locks the sum of two frequencies to a reference signal, using a feedback system called a phase-locked loop. The second technique produces the desired frequency by directly generating the difference of a stable reference frequency and an input frequency. This second approach is implemented to generate RF frequencies for grey molasses cooling on a Potassium-39 cold atom experiment. The presented implementation and optimisation of the new frequency-generated system decreases the temperature by „30 %”, while the atom number increases by „20 %”.
Additionally, the system has demonstrated long-term stability.

 

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