用非线性光学原理实现激光防护

较全面地介绍了近几年发展起来的用非线性光学原理实现激光防护的方法,分析了这一方法的优点和传统的线性光学方法的缺点,论述了激光防护技术的发展方向,对激光防护材料──非线性光学材料,提出了基本要求。     

Numerically determining the dispersion relations of nonlinear TEslab-guided waves in non-Kerr-like media

Dispersion relations are calculated numerically for nonlinear slab guides with a nonlinear core and linear claddings by using the transfer matrix method (TMM). The core can have any nonlinearities while high computation efficiency can still be achieved. As a result, a simple numerical calculation tool without spurious roots is presented for general nonlinear slab-guided structures     

激光感应液晶非线性光学效应

本文综述了液晶非线性光学效应的一般原理，描述了液晶电动流体力学不稳定性的各种机理指出了液晶研究的现代倾向。     

Third order nonlinear integrated optics

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     

液晶非线性光学和应用

描述了液晶非线性光学原理，介绍了液晶非线性光学元件的结构和制作方法，报道了我们的最新实验结果，提出了液晶非线性光学的研究方向和应用领域。     

Graphical representation for the density matrix in nonlinear optics

A technique for describing the time evolution of the density matrix by diagrams is developed. When applied to time harmonic optical mixing problems, the method allows one to write down the required matrix elements by inspection of the graphs. This allows a significant reduction in the calculations in addition to illustrating the physics of the processes.     

Temperature dispersion in KTP for nonlinear devices

Thermo-optic coefficients (dn/dT) determine the temperature characteristics of the nonlinear optical laser devices. These coefficients are analyzed critically by using a new model for the first time to formulate the temperature dispersion which can predict accurately the temperature bandwidths for various nonlinear interactions in a flux-grown KTP crystal. This model is based on the optical bandgaps, such as excitonic, a newly identified isentropic, and the thermal expansion coefficient     

光学二次非线性效应中的一些问题

从物理概念出发，通过数学解析，在Kleinman对称性条件下，给出二次非线性极化强度与光电场强的关系，并推导出振幅耦合方程。对有关文献和教材中振幅耦合方程的差异作了简略说明。     

Measurement of nonlinear and chromatic dispersion parameters of optical fibers using modulation instability

We present a simple method for the measurement of Kerr, second- and third-order dispersion coefficients in optical fibers using power and dispersion dependences of modulation instability near the zero-dispersion wavelength. We also complete the analysis by the accurate determination of the zero-dispersion wavelength of the fiber using the phase-matched four wave mixing process which occurs near this specific wavelength.     

TM-type soliton in nonlinear self-focusing media

A soliton of TM type is shown to exist in nonlinear self-focusing media and its propagation characteristics such as field distributions and propagation constant, are clarified and are compared with a soliton of TE type.     

Wave propagation in nonlinear electromagnetic media

This brief tutorial review first discusses the physical origin of nonlinear electric and magnetic susceptibilities of electro-magnetic media, from the audio through the microwave to the visible range of the electromagnetic spectrum. Wave propagation in non-linear media can be described by a combination of Maxwell's equations and the nonlinear constitutive equations. The Manley-Rowe relationships are verified for anisotropic lossless dielectrica. Microwave harmonic generation in ferrites and other materials, microwave modulation of light, light harmonic generation, light mixing and parametric conversion are all discussed from a general common viewpoint. The boundary conditions at the surface of a nonlinear medium lead to generalizations of the laws of reflection and refraction of light.     

Electromagnetic mode mixing in nonlinear media

A general theory of the coupling of electromagnetic modes in a nonlinear dielectric or magnetic medium is developed. The rate at which the mode amplitudes change, either in time or in space, is derived by a perturbation method similar to that previously used for stationary perturbations. The technique is illustrated by applying it to the problems of producing harmonic generation and parametric oscillation with a high-power laser, confocal resonator modes being used to describe mathematically both the focused laser beam and the output radiation. A comparison is made of resonant vs nonresonant structures for second harmonic generation, and threshold conditions are obtained for parametric oscillation. In addition, by combining the Manley-Rowe relations with the coupled mode equations, an alternative derivation of the symmetry properties of the nonlinear susceptibility tensor is given.     

Broad-band dynamic dispersion compensation in nonlinear fiber-based device

In this paper we report on the design, numerical simulation and experimental testing of a novel dynamic dispersion compensation device based on self-phase modulation (SPM) in nonlinear fiber. The proposed all-fiber device is inherently simple and presents several unique advantages, most notably the potential for a broad-band operation covering all wave-length division multiplexing (WDM) channels of a system and the ability to address variable amounts of residual dispersion in each individual channel. Dynamic compensation ranges of up to 140 ps/nm for a single-stage and 240 ps/nm for a two-stage device are demonstrated with 40 Gb/s CS-RZ signal. It is shown that the device can operate with a minimum channel spacing of 200 GHz. For a two-stage device with inter-stage spectral filtering, simultaneous dynamic dispersion compensation (130 ps/nm for 1 dB penalty) and 2R regeneration (2 dB receiver sensitivity improvement) are demonstrated.     

Three-dimensional integrated optics using polymers

Some of the key components are demonstrated to make three-dimensional (3-D) optical integrated circuits possible using polymers. Fabrication techniques of shadow reactive ion etching, shadow photolithography, and gray-level photolithography to produce complex 3-D integrated optic structures are demonstrated. Vertical waveguide bends exhibit excess losses of <0.3 dB, and vertical power splitters possess predictable output splitting ratios between multiple core levels with excess losses of <0.5 dB. Vertical polarization splitters exhibit power extinction ratios of 15 dB between the output core layers. A 1×4 vertical-horizontal power splitter is also demonstrated. Additionally, these techniques are used to integrate different polymer materials into the same optical circuit while easily solving the mode mismatch problem. To show the technique, a polymer electrooptic modulator is vertically integrated with a low-loss waveguide     

Side-chain maleimide based electro-optic polymer for second-order nonlinear optics

Due to their high EOcoefficients ,lowdielectric con-stant ,lowcost ,easy processing and monolithic integra-tion potential ,Electro-optic ( EO) polymer materialshave become the promising candidates for high perform-ance photonic devices[1].Such materials a…