摘要
光折变表面孤子是一种在光折变晶体界面传播的光折变孤子,是孤子向界面的自弯曲和界面的反射相平衡所导致的结果,利用光折变晶体的非局域扩散非线性结合局域漂移非线性或光伏非线性使孤子可以沿着表面天然直线路径传播,并且将光束能量局域在晶体的表面传播。表面光孤子提供的位相匹配条件可支持各种非线性现象得以增强。因此光折变表面孤子在表面光学、非线性光学、光束耦合、集成光学等方面具有巨大的应用潜力。
本文将围绕光折变表面孤子模式、传播、稳定性和激发进行研究,主要内容如下：
(1)设计了对表面孤子传播及尺寸调控的方法。理论上利用光束传播方法(Beam Propagation Method, BPM)模拟了表面屏蔽亮孤子传播规律,通过调节入射位置、外加电场、入射光强和背景光强来实现对表面孤子传播轨迹和孤子尺寸大小的调控,并通过实验验证与实现。
(2)提出了表面暗孤子,从理论上研究了表面暗孤子的模式、传播、稳定性分析和激发,实验中实现了扩散-光伏机制作用下光折变表面暗孤子在边界的反射和激发。
(3)利用表面暗孤子实现了对暗孤子蛇形失稳的抑制。验证了势场对调制失稳的作用。
(4)基于表面孤子写入了表面光波导,并实现了电固定和擦洗
(5)利用光折变表面孤子实现二次谐波产生的增强。研究了主动和被动两种方法来激发二次谐波。
本论文工作的创新点：按照上述来总结
1.首次在实验中观测到光折变表面暗孤子的激发,并导波。
2.首次发现表面对蛇形失稳的抑制作用。
3.首次在实验中实现对光折变表面孤子进行全面的调控。从入射位置、入射光强、背景光强、外加电场多方面进行全面的调控。
The photorefractive surface soliton is one of the photorefractive solitons which propagates along the interface of the photorefractive crystal. This kind of the soliton is induced by the balance of the gravitation of the self-blend and the exclusion of the boundary. The photorefractive surface soliton, which combines the diffusion nonlinear, drift nonlinear and the merit of the nature straight path of the surface, focuses the power of the beam into the surface of the crystal and let the beam go straight along the surface, both of these enhance many nonlinear phenomena of the crystal. It has great potential in the applications of the surface optics, nonlinear optics, beam-coupling and integrated optics.
In this paper, we will study the mode, transmission, stability and stimulation arouse the photorefractive surface soliton. The main sontents are as follows:
(1) Design method of the regulation of surface soliton propagation and size controlling. Simulate the surface screening soliton propagation based on the Beam Propagation Method, The size and trajectory of photorefractive surface solition can be modulated by launch position, applied external electric field and relative light intensity in theory and experiment.
(2) Put forward the surface dark soliton, and study the mode, transimission, stability and stimulation of the surface dark soliton in theory. Realized the reflection and excitation of the photorefractive surface dark soliton at the boundary under the diffusion-photovoltaic system in experiment.
(3) Realized the restrain of the snake instability by the surface dark soliton. Verify the effect of potential field to the modulation instability.
(4) Induce the optics waveguide by the surface soliton. Realized the electric fixing and scrubing of the waveguide.
The innovations of this paper:
1. The first experimental observation of the photorefractive surface soliton excitation, and the guided wave.
2. First discovery of the inhibition of snake stability by the surface.
3. Firstly experimently achieved the comprehensive regulation of the photorefractive surface soliton, such as the redulation of the incident position, incident light intensity, background intensity and electric field.
引文
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[4]Segev M, Valley G C, Crosignani B, et al. Steady-state spatial screening solitons in photorefractive materials with external applied field[J]. Physical review letters,1994,73(24):3211-3214.
[5]Valley G C, Segev M, Crosignani B, et al. Dark and bright photovoltaic spatial solitons[J]. Physical Review A,1994,50(6):R4457-R4460.
[6]Shih M, Leach P, Segev M, et al. Two-dimensional steady-state photorefractive screening solitons[J]. Optics letters,1996,21(5):324-326.
[7]Morin M, Duree G, Salamo G, et al. Waveguides formed by quasi-steady-state photorefractive spatial solitons[J]. Optics letters,1995,20(20):2066-2068.
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[14]Kang H Z, Zhang T H, Wang B H, et al. (2+1)Dsurface solitons in virtue of the cooperation of nonlocal and local nonlinearities[J]. Optics letters,2009,34(21):3298-3300.
[15]Safioui J, Fazio E, Devaux F, et al. Surface-wave pyroelectric photorefractive solitons[J]. Optics letters,2010,35(8):1254-1256.
[16]Duree G, Morin M, Salamo G, et al. Dark photorefractive spatial solitons and photorefractive vortex solitons[J]. Physical review letters,1995,74(11):1978-1981.
[17]Chen W Q, Yang X, Zhong S Y, et al. Surface dark screening solitons[J]. Optics letters,2011, 36(19):3801-3803.
[18]Ma M, Carretero-Gonzalez R, Kevrekidis P G, et al. Controlling the transverse instability of dark solitons and nucleation of vortices by a potential barrier[J]. Physical Review A,2010,82(2):023621.
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