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排序方式: 共有56条查询结果,搜索用时 15 毫秒
1.
We experimentally study the generation and storage of double slow light pulses in a Pr3+:Y2SiO5 crystal. Under electromagnetically induced transparency, a single signal pulse is stored in the spin coherence of the crystal. By simultaneously switching on two control fields to recall the stored information, the spin coherence is converted into two slow light pulses with distinct frequencies. Furthermore, the storage and controlled retrieval of double slow light pulses are obtained by manipulating the control fields. This study of double slow light pulses may have practical applications in information processing and all-optical networks. vspace2mm  相似文献   
2.
曲艺  张馨  陈红  高锦岳  周大凡 《中国物理》2005,14(7):1428-1432
利用溶胶凝胶方法,在硅碱玻璃底板上制备的透明低电阻SnO2:F薄膜,是一种低辐射导电薄膜。将SnCl4·5H2O 和 NH4F 溶解在50%乙醇和50%水的溶液中。制备条件为底板温度450℃,喷嘴与底板之间的距离60mm,载气流速8 L/min,制备时间5分钟。制成的SnO2:F薄膜面电阻为2Ω/□,可重复性好。并且文中还定性给出了SnO2:F薄膜其红外反射率与面电阻之间的关系。  相似文献   
3.
Polarization-independent wavelength conversion is demonstrated by using four-wave mixing (FWM) in a single semiconductor optical amplifier (SOA). In this scheme, all the incident fields are split into two orthogonal-polarized parts by polarizing beam splitters (PBS). Each of the two parts is then transmitted into one facet of the SOA and they are counter-propagating through the same amplifier. Wavelength conversion with the polarization sensitivity less than 1.3 dB is obtained over a range from 1510 to 1620 nm.  相似文献   
4.
吴金辉  高锦岳 《中国物理》2002,11(6):572-577
We have studied the absorption spectrum of a Doppler-broadened ladder system,where the highest level is coupled into two middle hyperfine sublevels by a strong coherent field.We find that,when the system is considered as homogeneous,either two or three spectral components are observed,depending on the detuning of the coherent field.but when the velocity distribution of atoms is considered,we can always observe one electromagnetically induced transparency (EIT) window with high dispersion.So the atomic hyperfine structure cannot be an impediment for obtaining EIT.  相似文献   
5.
何琼毅  王铁军  高锦岳 《中国物理》2006,15(8):1798-1805
A simple three-level system is proposed to produce high index of refraction with zero absorption in an Er^3+-doped yttrium aluminium garnet (YAG) crystal, which is achieved for a probe field between the excited state 4I13/2 and ground state 4I15/2 by adjusting a strong coherent driving field between the upper excited state 4I11/2 and 4I15/2. It is found that the changes of the frequency of the coherent driving field and the concentration of Er^3+ ions in the YAG crystal can maximize the index of refraction accompanied by vanishing absorption. This result could be useful for the dispersion compensation in fibre communication, laser particle acceleration, high precision magnetometry and so on.  相似文献   
6.
光的干涉衍射综合实验仪   总被引:3,自引:3,他引:0  
根据传统的光的干涉衍射实验装置存在的不足,研制出了光的干涉衍射综合实验仪.将光学元件放置在同一小型光学平台上,按照实验需要组合成相应仪器.该实验仪既可以用于光学演示实验,也可以作为光学专用的实验仪器。  相似文献   
7.
We proposed a four-level system to explore the quantum interference effects on optical amplification.We found that the gain of the probe.including positions and values of gain peaks,can be adjusted by changing the coherent field and the incoherent pumping.At the same time,we can also modify the absorption profile of electromagnetically induced transparency by the incoherent pump.The results provide a method to flatten the gain of Erbium-doped fibre amplifiers.  相似文献   
8.
We propose a scheme for light amplification in an asymmetric double quantum well, where two excited states are coupled by resonant tunnelling through a thin barrier in a three-level system of electronic subbands. By applying a single driving laser, the steady state gain can be obtained. The calculated gain spectrum for an asymmetric GaAs/AlGaAs double quantum well structure was presented.  相似文献   
9.
张冰  姜云  王刚  张理达  吴金辉  高锦岳 《中国物理 B》2011,20(5):50304-050304
This work explores the effect of spontaneous emission on coherence generation and population transfer in a threelevel ladder atomic system driven by two pulses in counterintuitive order.With adiabatic evolution and the weakdephasing approximation,we find that a large coherence and population transfer can be achieved even with spontaneous decay rate.The maximum coherence and population transfer decrease with the increase of spontaneous decay rate from the highest state to intermediate state.But this effect can be compensated by shortening the pulse width and enlarging the delay time.Results show that the coherence generation and population transfer never depend on the spontaneous decay rate from the intermediate state to ground state.The validity of the analytic solution is examined by numerical calculation.  相似文献   
10.
原子相干效应是光与物质相互作用的结果,它导致了一系列重要的物理现象。目前原子相干的实验研究工作主要在原子气体中开展,而与之相比固体材料中的相关实验研究具有更实际的应用前景。本文系统介绍了近年来固体材料中原子相干效应的研究进展,主要涉及电磁感应光透明、光速减慢与相干存储、存储光信息的可控制擦除、基于光存储的全光路由、双光脉冲的速度减慢和可逆存储和基于原子相干的增强四波混频等基本内容,最后还讨论了其在相关领域的应用。  相似文献   
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