音频段压缩态光场是进行连续变量量子精密测量重要的量子资源.本文利用自制的低噪声连续单频671 nm/1.34μm双波长激光器作为抽运源,抽运基于周期极化磷酸氧钛钾晶体的简并光学参量振荡器,进行了光通信波段1.34μm连续变量音频段真空压...音频段压缩态光场是进行连续变量量子精密测量重要的量子资源.本文利用自制的低噪声连续单频671 nm/1.34μm双波长激光器作为抽运源,抽运基于周期极化磷酸氧钛钾晶体的简并光学参量振荡器,进行了光通信波段1.34μm连续变量音频段真空压缩态光场的实验制备.当简并光学参量振荡器运转于阈值以下参量反放大状态时,抽运光场功率为95 mW,本地振荡光功率为60μW时,在分析频率8—100 k Hz范围内研制出1.34μm真空压缩态光场.在分析频率36 k Hz处,压缩态光场的最大压缩度达5.0 d B;在音频频率8k Hz处,压缩态光场的压缩度达3.0 d B.音频段1.34μm压缩态光场可用于实现基于光纤的量子精密测量.展开更多
The intensity difference squeezed state, which means that the fluctuation of the intensity difference between signal and idler beams is less than that of the corresponding shot noise level（SNL）, plays an important r...The intensity difference squeezed state, which means that the fluctuation of the intensity difference between signal and idler beams is less than that of the corresponding shot noise level（SNL）, plays an important role in high sensitivity measurement, quantum imaging, and quantum random numbers generation. When an optical parametric oscillator consisting of a type-Ⅱ phase-matching periodically poled KTiOPO4 crystal operates above the threshold, an intensity difference squeezed state at a telecommunication wavelength can be obtained. The squeezing of 7.7 ± 0.5 dB below the SNL is achieved in an analysis frequency region of 2.4–5.0 MHz.展开更多
An efficient and high-power diode-laser single-end-pumped Nd：YVO4 laser with cw emission at 1342nm is presented. With a crystal single-end-pumped by a fibre-coupled diode laser, an output power of 7.36 W is obtained ...An efficient and high-power diode-laser single-end-pumped Nd：YVO4 laser with cw emission at 1342nm is presented. With a crystal single-end-pumped by a fibre-coupled diode laser, an output power of 7.36 W is obtained from the laser cavity of concave-convex, eorresponding to an optical-to-optical conversion efficiency of 32.8%. The laser is operated in TEM00 mode with small rms noise amplitude of 0.3%. This represents, to the best of our knowledge, the highest power obtained from a diode-laser single-end-pumped Nd：YVO4 cw laser at 1342nm 80 far.展开更多
文摘音频段压缩态光场是进行连续变量量子精密测量重要的量子资源.本文利用自制的低噪声连续单频671 nm/1.34μm双波长激光器作为抽运源,抽运基于周期极化磷酸氧钛钾晶体的简并光学参量振荡器,进行了光通信波段1.34μm连续变量音频段真空压缩态光场的实验制备.当简并光学参量振荡器运转于阈值以下参量反放大状态时,抽运光场功率为95 mW,本地振荡光功率为60μW时,在分析频率8—100 k Hz范围内研制出1.34μm真空压缩态光场.在分析频率36 k Hz处,压缩态光场的最大压缩度达5.0 d B;在音频频率8k Hz处,压缩态光场的压缩度达3.0 d B.音频段1.34μm压缩态光场可用于实现基于光纤的量子精密测量.
基金supported by the National Key R&D Program of China(No.2016YFA0301402)the National Natural Science Foundation of China(Nos.11474190,61601270,11654002,and 61775127)+1 种基金the Program for Sanjin Scholars of Shanxi Provincethe Fund for Shanxi "1331" Project Key Subjects Construction
文摘The intensity difference squeezed state, which means that the fluctuation of the intensity difference between signal and idler beams is less than that of the corresponding shot noise level（SNL）, plays an important role in high sensitivity measurement, quantum imaging, and quantum random numbers generation. When an optical parametric oscillator consisting of a type-Ⅱ phase-matching periodically poled KTiOPO4 crystal operates above the threshold, an intensity difference squeezed state at a telecommunication wavelength can be obtained. The squeezing of 7.7 ± 0.5 dB below the SNL is achieved in an analysis frequency region of 2.4–5.0 MHz.
文摘An efficient and high-power diode-laser single-end-pumped Nd：YVO4 laser with cw emission at 1342nm is presented. With a crystal single-end-pumped by a fibre-coupled diode laser, an output power of 7.36 W is obtained from the laser cavity of concave-convex, eorresponding to an optical-to-optical conversion efficiency of 32.8%. The laser is operated in TEM00 mode with small rms noise amplitude of 0.3%. This represents, to the best of our knowledge, the highest power obtained from a diode-laser single-end-pumped Nd：YVO4 cw laser at 1342nm 80 far.
