Investigation Of Josephson Parametric Amplifier And All-Solid-State Continuous-Wave Single-Frequency 1.34μm Laser

The hot topic in current physics research is the interaction between light and matter, in order to better understand the underlying mechanisms, we need to have the appropriate "tools", such as the detector, light and so on. The study of atomic physics showed many resonance phenomenon of molecular and atomic nuclei presented with periodic force of electromagnetic field occur in microwave band, therefore, it is very important to detect and study the microwave signal for exploration of the internal structure and basic characteristics of material. With the development of superconducting circuit technology, the researches of Josephson junction and Josephson parametric amplifier about microwave have made great progress. The existing experiments confirm that Josephson parametric amplifier can be used as a low-noise signal detector to directly observe the quantum radiation field produced by a Rydberg atom in a microwave cavity. Squeezed microwave field using Josephson parametric amplifier will allow us to further improve the relevant measurement precision.All-solid state continuous wave single frequency lasers at 1.34μm have very important applications in data storage, optical communication, coherent information processing, space remote sensing and nonlinear optic and are important light source to study the interaction between light and matter due to their advantages in compact, high efficiency, good stability, beam quality factor close to the diffraction limit, low noise, narrow line-width, high coherence and wavelength in optical fiber communication band.Based on a series of achievements we have obtained in optical parametric oscillator and all solid state continuous wave single frequency laser, we deployed theoretical research about Josephson parametric amplifier and experimental preparation of all-solid state continuous wave single frequency lasers at 1.34μm. The research contents are as follows:First, based on circuit theory we derived equation of motion of Josephson parametric amplifier. Then, we researched two models of Duffing nonlinear oscillator and the Kerr-like nonlinear effect in different initial conditions and we solved the duffing equation of motion using iteration method to obtain the duffing oscillator frequency response curve, meanwhile, the properties of Josephson parametric amplifier have been analyzed by input-output theory, such as gain and bandwidth.Second, we developed all-solid state continuous wave single frequency laser at 1.34μm. We analyzed the source of thermal effect in the research process in laser. By dual-end polarized pumping scheme and directly pumped at 880nm to improve thermal effect of laser crystals. According to the thermal insensitive condition and mode matching condition, we designed six-mirrors ring resonator and introduced nonlinear loss by inserting a nonlinear crystal in resonator to improve the stability for a single-frequency laser. A maximum output of 10W continuous wave single frequency laser at 1.34μm is obtained and the frequency drift in one minute was less than 8.5 MHz.