Research On Optical Enhancement Cavity And PDH Frequency Stabilization Technology

High-quality and high intense ?-ray sources are required in many kinds of scientific and daily life researches.The ?-ray beam produced by Compton back scattering has the advantages of high intensity,quasi-monochrome,high alignment,and high energy.The Comptdon ?-ray source is becoming an important research direction.The photon intensity of a compton ?-ray source is determined by the collision an-gle,the scattering angle,the electron beam size and energy,the laser beam size and laser power.To get high-power laser,an optical enhancement cavity(OEC)is used to store and amplify laser by coherent enhancement.Research and design of OEC is necessary for higher intensity compton ?-ray sources.When designing an OEC,stability and match between laser and OEC should be taken into consideration.Matrix optics and MatLab programs are used to analyze and calculate the stability of an OEC.In this thesis,a six-mirror OEC for a mode locked laser with repetition rate 81.25 MHz is designed and analyzed.To keep a continuous resonance of the laser in the OEC,and to maintain a stable gain,a stabilization system is required.The Pound-Drever-Hall(PDH)technology is applied for its stablity and efficiency.We built a set of PDH frequency stabilization system for the microwave resonant ring as its analog to an OEC,to verify the efficiency of PDH technique.By modulating the incident signal,an error signal is generated from the reflected signal.The error signal is then used for a feedback loop for frequency stabilization based on Lab View program.This system is tested with both low input power and high input power.The result indicated that the PDH technology is efficient for microwave resonant ring and can maintain the gain of the ring.Besides the work on OEC and PDH,to meet the need of top-off operation of HLS-?,this thesis also completed the radiation dose rate monitor system based on the former research and analyzed the radiation dose.