摘要：
介绍了基于非线性光学参变过程产生和放大中红外可调谐超短激光脉冲的主要方法，比较了参变振荡、差频产生、光学参变放大和啁啾脉冲光学参变放大等4种产生与放大方法的技术特点，重点评述了最近10年来国内外利用光学参变放大和啁啾脉冲光学参变放大实现大增益宽带和高峰值功率输出的最新进展。探讨了获得更高能量/功率和更短脉冲(更大带宽) 中红外激光输出的关键问题和技术瓶颈及其解决途径。 The main methods of generation and amplification for tunable ultra-short middle-infrared laser pulses, based on nonlinear optical parametric process, are introduced briefly. The technical characteristics of the parametric oscillator, difference frequency generation, optical parametric amplification and chirped pulse optical parametric amplification are compared. Focusing on both expanding the gain bandwidth and improving the output power, the latest developments in the field of ultra-broadband optical parametric amplification and optical parametric chirped-pulse amplification in the past decade are highlighted. In addition, the key issues and technology bottlenecks as well as solutions of access to high energy/power and short pulse (broader bandwidth) are discussed.
作者机构：
[王友文; 范滇元] School of Physics and Microelectronics Science, Hunan University, Changsha 410082, China;[王友文; 陈列尊] Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China;[王友文; 邓剑钦; 文双春; 范滇元; 章礼富; 陈列尊; 傅喜泉; 张进] Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Computer and Communication, Hunan University, Changsha 410082, China
通讯机构：
School of Physics and Microelectronics Science, Hunan University, China
关键词：
啁啾脉冲;宽带激光;非线性传输;时域调制
摘要：
为避免时域调制增长形成的高强度时间尖峰对光学元件的损坏,数值研究了啁啾堆积脉冲宽带激光非线性传输的时域调制增长规律。结果表明:对于正常色散介质, 子脉冲间干涉引入的时间调制与外加调制随着传输距离的增加, 不断振荡减弱; 相反, 对于反常色散介质, 无外加时间噪声时, 堆积子脉冲间的相互干涉引入的时间调制有微弱增长, 但当传输距离进一步增加时, 子脉冲间干涉引入的调制可以获得快速增长; 而当外加非线性最快增长时间调制时, 时间调制发生迅速增长,具有破坏威胁的时间尖峰易于形成。 Characteristics of the temporal modulation riding on broad-band lasers stacked by chirped pulses are numerically investigated in nonlinear propagation. For the case of normal dispersion, the temporal modulations induced by interference among pulses and added artificially to simulate the noise weaken gradually with the increase of the propagation distance. For the case of anomalous dispersion, the temporal modulations induced by interference among pulses grow slowly at first, and start to grow rapidly after a long propagation distance; in contrast, the temporal modulations added artificially grow rapidly from the begin, indicating that the temporal peak of damage risk to the optics can be formed easily.
作者机构：
[王喜宗; 张军民; 周剑良; 凌球; 屈国普] School of Nuclear Science and Technology, Nanhua University, Hengyang 421001, China;[张军民] Department of Physics and Electronic Information Science, Hengyang Normal University, Hengyang 421008, China
通讯机构：
School of Nuclear Science and Technology, Nanhua University, China
摘要：
We propose and implement a quasi-discrete Hankel transform algorithm based on Dini series expansion (DQDHT)in this paper. By making use of the property that the zero-order Bessel function derivative J'_0(0)=0,the DQDHT can be used to calculate the values on the symmetry axis directly. In addition,except for the truncated treatment of the input function,no other approximation is made,thus the DQDHT satisfies the discrete Parseval theorem for energy conservation,implying that it has a high numerical accuracy. Further,we have performed several numerical tests. The test results show that the DQDHT has a very high numerical accuracy and keeps energy conservation even after thousands of times of repeating the transform either in a spatial domain or in a frequency domain. Finally,as an example,we have applied the DQDHT to the nonlinear propagation of a Gaussian beam through a Kerr medium system with cylindrical symmetry. The calculated results are found to be in excellent agreement with those based on the conventional 2D-FFT algorithm,while the simulation based on the proposed DQDHT takes much less computing time.
作者机构：
[Tang Shi-Qing; Xie Li-Jun; Zhang Deng-Yu; Gao Feng; Zhan Xiao-Gui] Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Henyang 421008, Peoples R China.;[Tang Shi-Qing; Xie Li-Jun] Xiangtan Univ, Fac Mat & Photoelect Phys, Xiangtan 411005, Peoples R China.
通讯机构：
[Tang Shi-Qing] H;Hengyang Normal Univ, Dept Phys & Elect Informat Sci, Henyang 421008, Peoples R China.
关键词：
No English Keywords
摘要：
We propose a scheme for realization of three-qubit controlled-phase gate via passing two three-level atoms through a high-Q optical cavity in a cavity QED system. In the presented protocol, the two stable ground states of the atoms act as the two controlling qubits and the zero- and one-photon Fock states of the cavity-field form the target qubit, and no auxiliary state or any measurement is required. The numerical simulation shows that the gate fidelities remain at a high level under the influence of the atomic spontaneous emission, the decay of the cavity mode and deviation of the coupling strength. The experimental feasibility of our proposal is also discussed.
