共查询到18条相似文献,搜索用时 594 毫秒
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从理论上研究了不对称双量子点系统内的Kerr非线性增强效应。系统内量子点间的电压隧穿效应,可以在两个不同的探测频率位置同时诱导电磁感应透明。调节隧穿电压及控制光场可以改变吸收性质,从而得到其中一个透明窗口内无线性和非线性吸收的Kerr非线性增强效应。分析表明,量子点间的电压调控引起的隧穿是产生Kerr非线性增强的关键因素。 相似文献
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周海光 《红外与毫米波学报》2002,21(Z1):112-114
对布满液晶微粒的聚合物(PDLC)进行了简并四波混频及光学双稳态的研究,并在文中对相关的PDLC中的分子重取向和热效应的非线性光学效应进行了讨论. 相似文献
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本文对近年来非线性光学效应产生VUV/XUV相干辐射的理论和实验进展进行了概括和总结,作者首先对该方面工作的理论和实验背景进行了回顾,然后重点阐述了各种产生VUV/XUV相干辐射的方法,如金属蒸汽中的双光子共振四波混频,惰性气体中的非共振和共振四波混频以及强激光场下的高次谐波过程等,最后本文简要地讨论了非线性光学效应产生VUV/XUV应用,并对本工作的发展前景进行了展望。 相似文献
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本文用简并四波混频效应研究了CdS1-xSex半导体玻璃的三阶非线性光学特性,实验结果表明这种材料具有大的非线性系数X^(3)和快速非线性响应时间。 相似文献
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本文从非线性光学的基本定义出发,分析和讨论了光学全息与非线性光学中四波混频的关系。明确指出,光学全息也是一种非线性光学过程,同时,由实验结果说明理论分析的正确性。 相似文献
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The authors propose and analyze the optical signal processing functionality of periodic structures consisting of alternating layers of materials possessing different Kerr nonlinearities. They explore structure-materials-performance relationships in all-optical analog-to-digital converters, hardlimiters, and AND and OR gates. They show that their proposed analog-to-digital converters can extract a binary word from multilevel optical signals in a single bit interval. They also propose a family of optical limiters whose output signal clamps to a set upper logic level for any input value exceeding a chosen threshold. They explore the performance of an all-optical logic gate whose forward-directed output implements a binary AND and whose backward-directed output implements an OR function 相似文献
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We analyze the optical signal processing functionality of periodic structures consisting of alternating layers of materials possessing opposite Kerr nonlinearities. By elaborating an analytical model and employing numerical simulations, we explore the performance of proposed passive optical limiters and switches. We prove that the proposed limiters provide true limiting by clamping the transmitted intensity at a level which is independent of the incident intensity. We explore the response of optical switches for signal and pump beams having the same and different frequencies. We describe and quantify the performance of the proposed structures in the realization of all-optical OR gates and optical hard-limiters. In addition, we prove that, for fabrication errors as large as 10%, qualitative device functionality remains, with performance only modestly degraded 相似文献
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An ultrafast all-optical switching scheme utilizing the optical Kerr effect in two birefringent fibers concatenated with each fast axis crossed is proposed. Stable optical Kerr modulation and all-optical demultiplexing of an ultrashort (30 p.s.) optical pulse train at 1.97 GHz from a gain-switched distributed-feedback laser diode (DFB LD) have been sufficiently demonstrated using CW mode-locking Nd:YAG laser pulses as a pump. Switching speed and required pump powers are studied in terms of fiber bandwidth due to fiber birefringence, and combined effects of chromatic and polarization dispersions on Kerr modulation profiles. By utilizing the optical Kerr modulation properties in the presence of dispersions, the nondiagonal yx component of the nonlinear refractive index is also determined to be 0.34 relative to the diagonal component xx . The intrinsic stability and ultimate switching capabilities are discussed 相似文献
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Intersubband transitions (ISBTs) in conduction‐band quantum wells (QWs) have attracted tremendous attention for their high technological potential, ranging from quantum cascade lasers, quantum well infrared photodetectors, to various nonlinear optical elements. One of the main characteristics of using the ISBTs is their polarization selection rule, which forbids a normal‐incidence geometry. Here, it is shown that the ISBT selection rule is not strict on optical nonlinearities in metallic QWs (MQWs). The nonlinear process of second harmonic generation nearly follows the selection rule, while the optical Kerr nonlinear process severely deviates from it. The anomalous optical selection rules result from the non‐negligible ultrafast electron–electron scattering in these plasmonic systems, and a coupled mode theory is provided to get a physical grasp of the problem. The flexible selection rule in MQWs could bring drastic improvements in efficiency and diversity of ISBT‐based devices. 相似文献
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A 10 Gbit/s optical data stream has been regenerated all-optically by clock recovery and remodulation. The regenerator consists of a fibre ring laser, modelocked by the incoming data stream, and a Kerr shutter acting as an all-optical AND gate to recode the ring laser pulses with the incoming data. Error ratio measurements for an all-optical regenerator are presented for the first time and the future potential of all-optical regeneration is discussed 相似文献
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Third order nonlinear integrated optics 总被引:6,自引:0,他引:6
Stegeman G.I. Wright E.M. Finlayson N. Zanoni R. Seaton C.T. 《Lightwave Technology, Journal of》1988,6(6):953-970
The authors review progress in the application of nonlinear optical phenomena to integrated optics. Essentially all integrated optics devices such as directional couplers, Mach-Zehnder interferometers, prism couplers, etc., can be used for all-optical signal processing when at least one of the waveguiding media exhibits an intensity-dependent refractive index. Experimental and theoretical results on the operating characteristics and figures of merit of such devices, as well as a new class of phenomena based on large nonlinear changes in waveguide properties will be summarized. Also discussed are measurement techniques for evaluating waveguide nonlinearities. Progress in the implementation of other nonlinear third order interactions, such as degenerate four-wave mixing and nonlinear spectroscopy, will also be reviewed 相似文献