压缩态论文：多横模压缩光的实验产生

1、 压缩态论文：多横模压缩光的实验产生【中文摘要】量子光学是建立在量子力学基础之上的一门学科,主要研究光场的量子特性,以及光与物质之间相互作用的量子效应。早在一个多世纪以前,人们就开始致力于量子光学的理论研究,分别成功解释了黑体辐射和光电效应,先后提出辐射场的量子论、光量子理论,为之后激光器的诞生奠定了坚实的基础。激光作为典型的相干态光场,为后续量子光学的实验发展开辟了一条全新的道路。到目前为止,量子光学无论从理论研究方面还是实验研究方面,都得到了喜人的成绩,具有美好的前景,尤其是非经典光场的产生以及应用方面,是量子信息科学以及技术的重要支撑。本文的主要工作是围绕多横模压缩光的实验产生展开的,其

2、核心内容包含以下几个方面：(1)光纤激光器的噪声抑制。光纤激光器作为新型的激光光源,具有体积小窄线宽,频率稳定性好等优点。然而,商用单频光纤激光器伴随有较大的强度噪声,妨碍其在量子信息领域的广泛应用。实验中,我们采用自制的模清洁器抑制其噪声,使得在3MHz处即可达到散粒噪声基准,从而满足实验需求。(2)光学参量振荡腔中高阶模的共振问题。理论分析了一阶厄米-高斯模TEMo1模和TEM1o模在光学参量放大器中的共振情况,并在实验中验证。针对非线性KTP晶体各向异性引入像散效应,导致TEMo1模和TEM1o模不能在光学参量放大器中同时共振,设计了一个原理简单而且容易操作的方案,使其可以在光学参量放大

3、器中同时共振。(3)高阶模压缩态光场。实现了TEMo1模和TEM1o模的同时共振之后,加入540nm的泵浦光,TEMo1模和TEM1o模均看到约3倍的增益。其输出场应具有压缩性质,采用平衡零拍方法测压缩,在干涉度大约为96%时,测得明亮TEMo1模有2.8dB的压缩,真空TEM10模有1.6dB的压缩。【英文摘要】Quantum optics, based on the quantum theory, mainly research the quantum characters of the optical field and the quantum effect of the interac

4、tion between light and matter. More than a century ago, people began to study the theory of quantum optics, which separately explained blackbody radiation and photoelectric effect. People put forward the quantum theory of radiation, quantum theory of light, which make a strong foundation for the eme

5、rgence of laser. As typical coherent beam, laser provides a new future for the development of quantum optics experiment. So far, whether the theoretical or the experimental research, quantum optics has remarkable performance and nice prospect, especially in the field of the generation and applicatio

6、n of nonclassical field.In this thesis, we introduce our works mainly around the experimental generation of transverse multimode squeezed fields. The key parts contain following aspects:(1) Noise suppression of fiber laser. As a new laser source, fiber laser has many advantages, for example: small,

7、narrow-linewidth, stable-operation and so on. However, commercial single frequency fiber laser has large intensity noise, which limits the widely use in the field of quantum information. In the experiment, we use a self-making mode cleaner to suppress its intensity noise, which can be suppressed nea

8、r to the shot noise limit after3MHz. This value is enough to meet the experiment demand.(2)The question about the resonance of high order modes in optical parametric oscillator. The oscillation of first-order Hermite-Gauss TEM01and TEM10modes in an optical parametric amplifier was analyzed theoretic

9、ally. In the experiment, corresponding phenomenon was directly observed. Because of the astigmatism caused by the crystal birefringence, and TEM10modes can not resonate simultaneously in the optical parametric amplifier, which can be solved by a new and easier-to-manipulated method. Through this met

10、hod, a single resonance peak was obtained for the TEM01and TEM10modes in the optical parametric amplifier.(3) Squeezed fields in high order modes. The system was seeded with a TEM01field and was carefully aligned such that the TEM01and TEM10modes can resonate simultaneously. The system can get a gai

11、n of3with green pumping in the TEMoo mode. The output fields should have squeezed character. Using balance homodyne detection with about96%interference degree, about2.8dB amplitude squeezed field in the TEM01bright mode and1.6dB amplitude squeezed field in the TEM10vacuum mode were produced separate

12、ly.【关键词】压缩态 光纤激光器 光学参量放大器 厄米-高斯模【英文关键词】Squeezed state Fiber laser Optical parametric amplifier Hermite-Gaussian mode【目录】多横模压缩光的实验产生 中文摘要 8-9 ABSTRACT 9-10 第一章 绪论 11-23 1.1 引言 11 1.2 压缩态光场 11-15 1.2.1 压缩特性 12-141.2.2 压缩态光场的应用 14-15 1.3 光学参量过程 15-18 1.4 压缩态探测 18-21 1.4.1 自零拍探测 18-20 1.4.2 平衡零拍探测 20-21 1.5 本文的主要工作 21-23 第二章 光纤激光器的噪声抑制 23-33 2.1 光纤激光器 23-26 2.1.1 工作原理 23-24 2.1.2 噪声特性 24-26 2.2 采用模清洁器实现噪声抑制 26-32 2.2.1 理论分析 26-28 2.2.2 实验研究 28-31 2.2.3 结果分析 31-32 2.3 本章小结 32-33 第三章 非简并光学参量放大器中多横模压缩光的同时产生 33-45 3.1 引言 33 3.2 NOPA腔 33-34 3.3 在NOPA腔中实现多横模同时共振 34-41