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报道了利用高功率全固态连续单频1.06μm激光器,抽运由准相位匹配晶体构成的单共振光学参量振荡器(SRO),产生光束质量接近衍射极限的1.5μm连续单频激光的实验研究。实验获得了输出功率为3.2W的连续单频1.5μm激光,光光转换效率达40%,SRO的阈值抽运功率仅为2.5W。当把SRO腔长主动锁定到共焦法布里-珀罗(F-P)腔的共振峰上,信号光的频率稳定性优于3MHz(1min)、功率稳定性优于±0.5%(15min)。该系统的激光波长位于量子态传输波段,可用于研究实用化量子信息处理系统。 相似文献
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We report on the generation of a squeezing vacuum at 1.55 μm using an optical parametric amplifier based on periodically poled LiNbO3. Using three specifically designed narrow linewidth mode cleaners as the spatial mode and noise filter of the laser at 1.55 μm and 775 nm, the squeezed vacuum of up to 3.0 dB below the shot noise level at 1.55 μm is experimentally obtained. This system is compatible with standard telecommunication optical fibers, and will be useful for continuous variable long-distance quantum communication and distributed quantum computing. 相似文献
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连续变量纠缠态由于其确定性产生、高效率的特点而被广泛应用于连续变量量子信息处理.在量子信息处理过程中纠缠态与量子信道发生相互作用而退相干,这是限制长距离量子信息发展的重要因素之一.光纤信道作为理想的量子信道,是目前连续变量量子信息研究关注的热点.本文利用Ⅱ类匹配的楔角极化磷酸氧钛钾晶体构成了三共振的非简并光学参量放大器,获得了8.3 dB的光通信波段1.5μm连续变量纠缠态光场.将产生的纠缠态光场注入单模光纤,其量子特性在传输距离达50 km后仍得到保持,纠缠度为0.21dB.该研究可为基于光纤的长距离连续变量量子信息研究提供有效的依据. 相似文献
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高功率低噪声全固态连续波单频激光器在量子科学与技术、冷原子物理、高精度精密测量以及光学传感等领域有着广泛的应用。为了满足应用需求,在泵浦功率增大的条件下,需克服激光晶体热效应的影响,提高激光器输出功率,同时保持单频输出特性和光束质量不变,降低激光器在低频段的强度噪声并扩展激光器的输出波长等。针对这些关键问题,本课题组开展了原理研究和器件设计,研制出一系列具有不同输出波长的高功率低噪声全固态连续波无跳模单频激光器。总结和介绍了本课题组在高功率低噪声全固态连续波无跳模单频激光器方面的研究进展,并展望了单频激光器的发展趋势。 相似文献
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Generation of self-oscillations from a singly resonant periodically poled potassium titanyl phosphate crystal frequency doubler 下载免费PDF全文
We report on the generation of self-oscillations from a continuously pumped singly resonant frequency doubler based on a periodically poled potassium titanyl phosphate crystal (PPKTP). The sustained square-wave and staircase curve of self-oscillations are obtained when the incident pump powers are below and above the threshold of subharmonic-pumped parametric oscillation (SPO), respectively. The self-oscillations can be explained by the competition between the phase shifts induced by cascading nonlinearity and thermal effect, and the influence of fundamental nonlinear phase shift by the generation of SPO. The simulation results are in good agreement with the experiment data. 相似文献
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连续变量压缩态光场的制备在量子光学和量子信息科学领域具有重要的地位,连续变量多模压缩态光场在多维量子信息传输、量子计算以及高精细度测量等方面存在着潜力巨大的应用前景。本文介绍了该方面的研究现状和国际动态。 相似文献
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