Generation Of The Squeezed State And Its Application In Low-frequency Signal Measurement

This thesis reports the generation of squeezed light field with the second-order parametric process, and the squeezed degree is measured with balanced homodyne detection, we obtain the squeezed light of0.5dB on the sideband frequency5MHz, then a method of generating low-frequency squeezing with a two-frequency laser and the higher-frequency sidebands of the squeezed state is experimentally investigated. At last, Laguerre-Gaussian modes is studied, and the Laguerre-Gaussian modes were produced in the experiment with optical cavity. Experimental results agree well with the theoretical analysis.This article is divided into five chapters. The first chapter briefly reviews the background of squeezed state and the states-of-art; the second chapter introduces the basic experimental techniques used in this thesis; the third chapter is the central topic of this thesis, generation of squeezed light field with the parametric process and generation of low-frequency squeezing; the fourth chapter introduces an extra work, generation of Laguerre-Gaussian modes with optical cavity; the fifth chapter, summary and the next-step plan.