The Study Of Digitized Laser Control System

This article describes a FPGA-based system which including laser’s frequency stabilizing, power and timing control. This system is applying to our atom interferometers now. Compared to the previous plan, which named "frequency to voltage converter", the new scheme has a higher stability and accuracy, moreover, can achieve a fine locked-in effect when frequency hopped.In chapter one, the demands of whole laser system are analyzed. Then a detail plan is made which concerning how to realize each sub-module according to the actual requirement;The basic principle of optical phase-locked loop is analyzed in chapter two. Then we point out how important the loop filter plays in designing PLL, and highlight how to design loop filter. It is very important to realize the interlocking between two Lasers (DFB#1and DFB#2). Using OPLL (Optical Phase Locked Loop) is a valid scheme which could solve this kind of problem;In chapter three, a valid scheme of Universal Serial Bus (USB) is presented to solve the data communication between PC and device, which connected master device and slave devices. Taking advantage of this technology, we design a new version of DDS:In chapter four, a new scheme is explained in detail to implement digital control in aLock. Then some core technologies of DSP systems are analyzed, such as IIR and analog-to-digital conversion technology;In chapter five, the concept of systematic control is conceived and the prototype of the entire system is given;A summary of current work and outlook of subsequent plan is presented in the last chapter;...