利用准相位匹配晶体产生1.5μm压缩态光场的理论和实验研究
发布时间：2018-12-13 06:52
【摘要】：在量子信息科学研究中,比较理想的量子信息网络系统是以光和原子分别作为量子信息的传输载体和存储节点。由于1.5 μm波段不仅对应着光纤的低色散窗口,同时更是最低损耗传输窗口,这些特性使得该波段的高质量非经典光源在基于光纤传输的光纤通信系统中有着重要的应用,也吸引了各个国家的众多科研工作者进行这方面的研究。人们希望能够制备高质量的纠缠态光场,使其加载着信息在光纤中低损耗长距离地传输,并保持其量子特性尽量不受到破坏,有效地进行量子信息处理,从而促进量子信息技术的发展,实现量子信息和现有成熟的光纤通信的结合,最终推动量子信息系统的建立和发展。而开展这些研究工作需要以该波段的高质量压缩源为基础。本学位论文围绕连续变量1.5-tm光通信波段压缩态光场的产生展开了一系列的理论和实验研究,主要完成了以下几方面的工作：(1)利用模清洁器降低光纤激光器输出1.5μm激光的噪声。基于模清洁器具有能够有效地过滤激光噪声的特性,实验上采用两个模清洁器对光纤激光器输出的1.5μ-m激光进行了二次过滤,透过效率均为80%,二级过滤后激光的强度噪声在分析频率3MHz处达到了散粒噪声基准。输出的低噪声1.5μm激光用作后续实验倍频过程的基频光和压缩态光场的平衡零拍探测系统的本底光。(2)利用高效率外腔谐振倍频技术,在实验上获得了连续单频780nm激光,倍频效率高达84.8%。采用前面制备的1.51μm激光作为基频光、周期极化铌酸锂(PPLN)晶体作为非线性晶体,我们通过高效率倍频过程得到了倍频光,最大输出功率达1W。为了满足后续实验中光学参量振荡器对泵浦光低噪声的要求,我们在倍频腔后加入模清洁器来进一步改善激光的噪声特性,透射激光的强度噪声在分析频率4MHz处达到了散粒噪声基准,功率最大达700mW,透过效率为80%。(3)利用准相位匹配晶体产生了1.51μm光通信波段的压缩态光场。分析了影响光学参量振荡过程产生压缩态光场的因素,实验上采用前面制备的低噪声780nm单频激光,通过阈值以下简并光学参量振荡器,在实验上获得了压缩度达3dB的1.5μm压缩真空态光场。
[Abstract]:In the research of quantum information science, the ideal quantum information network system is to use light and atom as the transmission carrier and storage node of quantum information, respectively. The 1.5 渭 m band not only corresponds to the low dispersion window of the optical fiber, but also the lowest loss transmission window. These characteristics make the high quality non-classical light source of the band have important applications in the optical fiber communication system based on the optical fiber transmission. It has also attracted a large number of researchers from various countries to carry out research in this area. People hope to be able to prepare high quality entangled state light field, so that it can load the information in the fiber and transmit it long distance at low loss, and keep its quantum properties intact as far as possible, so that the quantum information can be processed effectively. In order to promote the development of quantum information technology, realize the combination of quantum information and existing mature optical fiber communication, and finally promote the establishment and development of quantum information system. These studies need to be based on high-quality compression sources in this band. In this dissertation, a series of theoretical and experimental studies have been carried out on the generation of squeezed state light fields in continuous variable 1.5-tm optical communication band. The main works are as follows: (1) the noise of 1.5 渭 m laser output from the fiber laser is reduced by using the mode cleaner. Based on the characteristic that the mode cleaner can filter the laser noise effectively, two mode cleaners are used to filter the 1.5 渭 -m laser output from the fiber laser. The transmission efficiency is 80%. The intensity noise of the laser after two stage filtering has reached the standard of shot noise at the analytical frequency 3MHz. The output low noise 1.5 渭 m laser is used as the background light of the fundamental frequency light and the balanced zero-beat detection system of the squeezed state light field in the subsequent experimental frequency doubling process. (2) the continuous single-frequency 780nm laser is experimentally obtained by using the high-efficiency external cavity resonant frequency-doubling technique. The efficiency of frequency doubling is as high as 84.8. Using the 1. 51 渭 m laser as the fundamental frequency light and the periodically polarized lithium niobate (PPLN) crystal as the nonlinear crystal, we obtain the double frequency light through the high efficiency frequency doubling process. The maximum output power is 1 W. In order to meet the requirements of the optical parametric oscillator for the low noise of the pump light in the subsequent experiments, we add a mode cleaner behind the frequency doubling cavity to further improve the noise characteristics of the laser. The intensity noise of the transmission laser reaches the standard of granular noise at the analytical frequency 4MHz, the maximum power is 700mW, and the transmission efficiency is 80. (3) the squeezed light field in the optical communication band of 1. 51 渭 m is generated by using the quasi phase matching crystal. The factors influencing the squeezed optical field in the process of optical parametric oscillation are analyzed. In the experiment, the low noise 780nm single frequency laser is used in the experiment, and the degenerate optical parametric oscillator is obtained under the threshold. The 1. 5 渭 m squeezed vacuum light field with squeezing degree of 3dB has been obtained experimentally.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1
本文编号：2376103
[Abstract]:In the research of quantum information science, the ideal quantum information network system is to use light and atom as the transmission carrier and storage node of quantum information, respectively. The 1.5 渭 m band not only corresponds to the low dispersion window of the optical fiber, but also the lowest loss transmission window. These characteristics make the high quality non-classical light source of the band have important applications in the optical fiber communication system based on the optical fiber transmission. It has also attracted a large number of researchers from various countries to carry out research in this area. People hope to be able to prepare high quality entangled state light field, so that it can load the information in the fiber and transmit it long distance at low loss, and keep its quantum properties intact as far as possible, so that the quantum information can be processed effectively. In order to promote the development of quantum information technology, realize the combination of quantum information and existing mature optical fiber communication, and finally promote the establishment and development of quantum information system. These studies need to be based on high-quality compression sources in this band. In this dissertation, a series of theoretical and experimental studies have been carried out on the generation of squeezed state light fields in continuous variable 1.5-tm optical communication band. The main works are as follows: (1) the noise of 1.5 渭 m laser output from the fiber laser is reduced by using the mode cleaner. Based on the characteristic that the mode cleaner can filter the laser noise effectively, two mode cleaners are used to filter the 1.5 渭 -m laser output from the fiber laser. The transmission efficiency is 80%. The intensity noise of the laser after two stage filtering has reached the standard of shot noise at the analytical frequency 3MHz. The output low noise 1.5 渭 m laser is used as the background light of the fundamental frequency light and the balanced zero-beat detection system of the squeezed state light field in the subsequent experimental frequency doubling process. (2) the continuous single-frequency 780nm laser is experimentally obtained by using the high-efficiency external cavity resonant frequency-doubling technique. The efficiency of frequency doubling is as high as 84.8. Using the 1. 51 渭 m laser as the fundamental frequency light and the periodically polarized lithium niobate (PPLN) crystal as the nonlinear crystal, we obtain the double frequency light through the high efficiency frequency doubling process. The maximum output power is 1 W. In order to meet the requirements of the optical parametric oscillator for the low noise of the pump light in the subsequent experiments, we add a mode cleaner behind the frequency doubling cavity to further improve the noise characteristics of the laser. The intensity noise of the transmission laser reaches the standard of granular noise at the analytical frequency 4MHz, the maximum power is 700mW, and the transmission efficiency is 80. (3) the squeezed light field in the optical communication band of 1. 51 渭 m is generated by using the quasi phase matching crystal. The factors influencing the squeezed optical field in the process of optical parametric oscillation are analyzed. In the experiment, the low noise 780nm single frequency laser is used in the experiment, and the degenerate optical parametric oscillator is obtained under the threshold. The 1. 5 渭 m squeezed vacuum light field with squeezing degree of 3dB has been obtained experimentally.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.1
【共引文献】
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，本文编号：2376103
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