TY - BOOK

T1 - A FPGA based laser DPLL for atom interferometry

AU - Papakonstantinou, Alexandros

PY - 2024

Y1 - 2024

N2 - Atom interferometers have gained attention in both fundamental physics research and practical applications thanks to their high accuracy. Improving them is a widespread area of research and generating highly phase stabilized light fields is crucial for enhancing their accuracy, pushing the requirements to their hardware beyond state-of-the-art. Bose-Einstein condensates (BECs) are particularly advantageous as a probe in e.g. a classical Mach-Zehnder setup, since they enhance the interferometer’s sensitivity due to their long possible observation times. These longer observation times, compared to thermal ensembles, allow for more precise measurements of accelerations by detecting the quantum mechanical phase of the atomic ensembles after an interferometry sequence. The creation of a BEC is a complex process that requires coherent, frequency stabilized light of different wavelengths. Moving an AI which uses BECs into a microgravity environment allows for smaller apparatuses and longer interferometry sequences. However, the requirements in terms of accuracy for the hardware that drives the laser systems remain but their size, weight and power budget need to be reduced for space-born apparatuses. One possible way to measure the quantum mechanical phase of an interferometer output is Raman double diffraction. For this purpose, a FPGA based digital phase locked loop (DPLL) was developed and evaluated for the usage in an atom interferometer with Raman double diffraction within the sounding rocket missions of MAIUS-B. For space applications a digital system is very favorable since parameters of the loop can be adjusted without soldering and with communication from a distance. Furthermore, the digitally tunable Numeric Controlled Oscillator (NCO), implemented as the reference oscillator, enables tuning setpoints as high as the laser current range of the hardware. Additionally, the digital Phase Frequency Detector (PFD) of the DPLL can

AB - Atom interferometers have gained attention in both fundamental physics research and practical applications thanks to their high accuracy. Improving them is a widespread area of research and generating highly phase stabilized light fields is crucial for enhancing their accuracy, pushing the requirements to their hardware beyond state-of-the-art. Bose-Einstein condensates (BECs) are particularly advantageous as a probe in e.g. a classical Mach-Zehnder setup, since they enhance the interferometer’s sensitivity due to their long possible observation times. These longer observation times, compared to thermal ensembles, allow for more precise measurements of accelerations by detecting the quantum mechanical phase of the atomic ensembles after an interferometry sequence. The creation of a BEC is a complex process that requires coherent, frequency stabilized light of different wavelengths. Moving an AI which uses BECs into a microgravity environment allows for smaller apparatuses and longer interferometry sequences. However, the requirements in terms of accuracy for the hardware that drives the laser systems remain but their size, weight and power budget need to be reduced for space-born apparatuses. One possible way to measure the quantum mechanical phase of an interferometer output is Raman double diffraction. For this purpose, a FPGA based digital phase locked loop (DPLL) was developed and evaluated for the usage in an atom interferometer with Raman double diffraction within the sounding rocket missions of MAIUS-B. For space applications a digital system is very favorable since parameters of the loop can be adjusted without soldering and with communication from a distance. Furthermore, the digitally tunable Numeric Controlled Oscillator (NCO), implemented as the reference oscillator, enables tuning setpoints as high as the laser current range of the hardware. Additionally, the digital Phase Frequency Detector (PFD) of the DPLL can

U2 - 10.15488/16220

DO - 10.15488/16220

M3 - Doctoral thesis

CY - Hannover

ER -