共查询到17条相似文献,搜索用时 546 毫秒
1.
研究了基于双光束耦合的光折变耗散系统中全息明孤子的温度演化特性.数值计算结果表明,晶体温度与刚性全息孤子的稳定性密切相关.在一定温度下,全息孤子能在晶体中传播足够远的距离;当晶体温度漂移不大时,入射孤子能演化成稳定的全息孤子继续传播;而当晶体温度变化足够大时,孤子波强度随传播距离增加或减小,入射孤子不能以稳定的全息孤子态传播.讨论了将刚性全息孤子的温度特性应用于光学衰减、中继器件的可能性.
关键词:
空间光孤子
光折变非线性光学
耗散系统
全息聚焦 相似文献
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《中国光学与应用光学文摘》2005,(3)
O437 2005031813 非对称光折变全息空间光孤子的存在曲线=Existence curves of asymmetric photorefractive holographic spatial optical solitons[刊,中]/刘劲松(华中科技大学激光技术国 家重点实验室.湖北,武汉(430074))∥物理学报.-2004, 53(9).-3014-3019 证明了在加外电场的光折变晶体中存在非对称全息 空间光孤子对,其特征是孤子对中的两个孤子具有相同的 宽度、不同的振幅。给出了这种孤子对的存在曲线,其中 相似文献
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对外加电场光折变有机聚合物串联回路中独立空间孤子对进行了理论研究,导出了在光折变有机聚合物串联回路中两光束传播的耦合方程,证明了串联回路中存在暗-暗、明-暗和明-明三种独立空间孤子对.在光束的空间展宽远小于有机聚合物宽度的极限条件下,暗-暗孤子对之间孤子入射光强的改变可相互影响到对方的包络和动态演化.对于明-暗孤子对,暗孤子通过光电流能影响明孤子,但明孤子不能影响暗孤子.明-明孤子对之间没有影响.
关键词:
非线性光学
光折变效应
光折变聚合物
空间孤子对 相似文献
11.
Separate holographic screening soliton pairs in a biased series photorefractive crystal circuit
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Holographic dark (bright) screening solitons are predicted
in one dimension for a series circuit consisting of two
photorefractive crystals connected electronically by electrode leads
in a chain with a voltage source. Each crystal can support a
holographic screening soliton. The two solitons are known
collectively as a separate holographic screening soliton pair with
three types: bright--bright, bright--dark and dark--dark. The
numerical results show that the two solitons in a soliton pair can
affect each other through a light-induced current and their coupling
can affect their spatial profiles under the limit in which the
optical wave has a spatial extent much less than the width of the
crystal. 相似文献
12.
We report what is, to our knowledge, the first experimental observation of stable new bound soliton pairs at the 10 GHz repetition rate in a hybrid FM harmonic mode-locked Er-fiber laser (1177 soliton pairs simultaneously in the laser cavity). The two solitons in the soliton pair have the identical pulse shape and are with the antiphase (pi phase difference). Their time separation is about three times the FWHM soliton width and varies with the phase modulation strength. The corresponding mechanism for explaining the formation as well as the superior stability of these closely bound soliton pairs is also given. 相似文献
13.
This paper presents calculations for an idea in photorefractive spatial solitons, namely, a dissipative holographic soliton and a two-photon-Hamiltonian spatial soliton in one dimension form in an unbiased series photorefractive crystal circuit consisting of a single-photon photorefractive crystals and a two-photon one of which at least one must be photovoltaic. The two solitons are known collectively as a separate Holographic–Hamiltonian spatial soliton pair and there are two types: dark–dark and bright–dark if only one crystal of circuit is photovoltaic. The results show that the two-photon-Hamiltonian soliton in a soliton pair can affect the holographic one by light-induced current and the holographic soliton cannot affect the two-photon-Hamiltonian one. 相似文献
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We show that incoherently coupled soliton pairs can
exist in nonlocal Kerr-type nonlinear media. Such
solitons can propagate in bright--bright, dark--dark, and gray--gray
configurations. When the nonlocal nonlinearity is absent, these
bright--bright and dark--dark soliton pairs are those observed
previously in local Kerr-type nonlinear media. Our analysis
indicates that for a self-focusing nonlinearity the intensity full
width half maximum (FWHM) of the bright--bright pair components
increases with the degree of nonlocality of the nonlinear response,
whereas for a self-defocusing nonlinearity the intensity FWHM of the
dark--dark and gray--gray pair components decreases with the
increase in the degree of nonlocality of the nonlinear response. The
stability of these soliton pairs has been investigated numerically
and it has been found that they are stable. 相似文献
15.
Separate Holographic-Hamiltonian screening soliton pairs are predicted in a biased series photorefractive crystal circuit consisting of two photorefractive crystals connected electronically by electrode leads in a chain with a voltage source. The existence of four types of the separate soliton pairs: dark–dark, bright–dark, dark–bright and bright–bright in such a circuit is proved. Under the limit in which the spatial extent of the optical wave is much less than the width of the crystal, the Hamiltonian dark soliton can affect the other soliton by the light-induced current whereas the Hamiltonian bright soliton and holographic soliton cannot affect the other soliton in the soliton pair. 相似文献
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Separate spatial soliton pairs in an unbiased series two-photon photorefractive crystal circuit 总被引:1,自引:0,他引:1
Dark (bright) steady-state spatial solitons are predicted in one dimension for a series circuit consisting of two two-photon photorefractive crystals of which at least one must be photovoltaic. Each crystal can support a spatial soliton. The two solitons are known collectively as separate spatial soliton pairs with three types: dark-dark, bright-dark and bright-bright. In the limit in which the optical wave has a spatial extent much less than the width of the crystal, the dark soliton can affect the other soliton by light-induced current, but the bright soliton cannot affect the other soliton in the soliton pair. 相似文献
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We theoretically study the formation of multiple dark photovoltaic soliton splitting in the quasi-steady-state and steady-state
regimes under open-circuit conditions. We find that the initial width of the dark notch at the entrance face of the crystal
is a key parameter for generating an even (or odd) number sequence of dark coherent photovoltaic solitons. If the initial
width of the dark notch is small, only a fundamental soliton or Y-junction soliton pair is generated. As the initial width
of the dark notch is increased, the dark notch tends to split into an odd (or even) number of multiple dark photovoltaic solitons,
which realizes a progressive transition from a low-order soliton to a sequence of higher-order solitons. The soliton pairs
far away from the centre have bigger width and less visibility. In addition, when the distance from the centre of the dark
notch increases, the separations between adjacent dark stripes become slightly smaller. 相似文献