Study Of Phase Frequency Control System For Atom Interferometer

Atom interferometer is an effective way to measure weak field by using the method of matter-wave interference. It uses the cold atom technology to obtain atom wave packet, and then use Laser as beam splitter and combiner, finally acquire the interference phase, which contains information of the weak field. This technology has good application prospect in precision measurement.This article describes a complete set of diode laser phase-frequency control system for atom interferometer experiment. The first chapter introduces the brief principle of atom interferometer and finds out the Laser system form we need. It will also discusses the time scheduling of the system. The second chapter bases on the point of experiment, first introduces the principle of the diode laser and how to control it. Then analyses the design technic of PID controller, and gives a design of series connection PID module based on lag-lead filter. This homemade module can partly replace the function of DigiLock 110 module in diode laser control system. This chapter also describes the three main part of the phase frequency system, MTS frequency stabilization, frequency voltage convert relative frequency lock, and the OPLL for Raman lasers. In addition, we discuss the difference and relation of the frequency detector and the phase detector, and how they affect the loop. The last chapter gives out the noise transformation from laser phase noise to the atom interferometer phase noise, and calculates the equivalent accuracy of our phase frequency control system.