Er:Glass NPRO激光强度噪声的全量子理论分析与实验研究

项目名称： Er:Glass NPRO激光强度噪声的全量子理论分析与实验研究

项目编号： No.61308041

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 王云祥

作者单位： 电子科技大学

项目金额： 26万元

中文摘要： 零差相干光通信是解决未来天基通信带宽瓶颈的重要途径，该体制对光源的强度噪声、线宽和功率均提出了很高的要求。利用非平面环形激光器（NPRO）易获得窄线宽、高功率输出的优点，采用Er:Glass建立NPRO并抑制其强度噪声，将为天基通信应用提供一种理想的1.55微米波段光源。主要研究内容包括三个方面：三能级固体激光噪声的理论分析，低噪声NPRO设计和激光噪声抑制实验研究。通过建立三能级固体激光噪声的全量子理论分析模型，求解噪声传递函数和输出噪声谱，克服传统速率方程理论定量分析不准确的缺陷。基于低折射率介质设计和研制NPRO，获得足够大的本征偏振态损耗差，实现稳定的单频行波振荡，突破NPRO介质折射率须大于1.73的传统观念。采用高阶相位超前电路设计反馈控制环路，更好的补偿高频相位延迟，改善噪声抑制效果。预期获得相对强度噪声低于-150dB/Hz、功率大于500mW的单频窄线宽激光输出。

中文关键词： 全量子理论；强度噪声；三能级；非平面环形激光器；光电负反馈

英文摘要： Abstract: Homodyne coherent optical communication is an important technique for breaking through the bandwidth bottleneck of space communication in the future. This system has high requirements for the intensity noise, linewidth and power of light source. It is easy to get narrow linewidth and high power from nonplanar ring oscillators (NPRO). Benefiting from this virtue, it will be an ideal 1.55 micrometer laser source for space communication application by constructing NPRO with Er:Glass as the gain medium and suppressing its noise. The research contents of this project include: the theory of three-level solid-state laser noise, design of low noise NPRO and laser noise suppressing experiments. By constructing a full quantum theoretical model for three-level solid-state laser system, noise transfer function and output noise spectrum will be deduced, to overcome the inaccurateness of traditional rate equation in quantification. NPRO would be designed and constructed based on medium with low refraction index, and enough loss difference of different eigenpolarizations could still be reached, which breaks through the traditional conception that the refractive index has to be larger than 1.73. High order phase advancing circuits would be used in the design of negative feedback loop, which can compensate phase delay

英文关键词： Full quantum theory；Intensity noise；Three level；Nonplanar ring oscillator；Photoelectric negative feedback