渡越加宽的经典理论

渡越加宽的经典理论陈书潮（厦门大学物理系厦门3610｛）5）渡越加宽也叫飞行时间加宽。若粒子与辐照光场的相互作用时间T比较短，即T与自发辐射寿命，量级相近或T＜T的情况，就必须考虑渡越加宽，即假定粒子在T＝0~T时间内，在光场的作用下，以自由振子的运..

偏振光在介质两界面的反射特性

偏振光在介质两界面的反射特性陈书潮（厦门大学物理系，厦门361005）廖学明（漳州师院物理系，漳州363000）本文根据光场的迭加原理，研究了折射率非均匀介质对线偏振光的反射特性。在我们的实验中，观察到线偏振光人射到均匀或非均匀折射率介质后，其反射光..

Optical Bistability and Optical Limiting of Nonlinearly Periodic Medium inside a Ring Cavity

研究了环形腔中的非线性周期结构介质的光学双稳态和光限现象，建立了输入光强与输出光强关系的表达式。理论上给出了临界入射光强低达10-7W/CM2的光学双稳态的条件和非常有效的限光作用的条件The optical bistability and optical limiting of nonlinearly periodic medium inside a ring cavity are discussed in the paper.The expression For the relation between the input light intensity and the output light intensity is derived.The conditions For the threshold intensity as low as 10 -7 W/cm 2 of optical bistability and very eFFective optical limiting are given in theory.福建省自然科学基金会资

热透镜效应光谱的信噪比

热透镜效应光谱的信噪比陈书潮，林钧锋（厦门大学物理系，厦门361005）（漳州师院物理系，漳州363000）在弱吸收谱线观测中，常需要用很强的人射光，其热效应导致被测介质的折射率变化，形成热透镜，并使光束再聚焦或发散。热透镜光谱就是利用此原理测量介质..

An Analysis of Cavity Stability with Linear and Nonlinear Temperature Grade

本文研究了大功率激光器中激活介质同时存在横向一阶和二阶各向异性温度梯度对光传输的影响，给出了对称腔的稳定性条件公式。The inFluence, which is due to linear and nonlinear temperature grade distributed anisotropically in the cross-section of laser media in high power laser cavity, on the ray-propagation and hence on the cavity stability was studied.Stable conditions of corresponding laser cavity were given

Optical Bistability of EBBA Liquid Crystal

利用光自聚焦和f-P腔两种手段，对EbbA液晶进行了光学双稳态研究。实验是在60μM液晶薄膜中采用连续Ar＋激光器进行，确定出温度与光学双稳态和多级光学双稳态回线的关系，讨论了EbbA液晶在固态相和液晶相及其相变过程中光学双稳态的机制。Using self focusing and Fabry Perot cavity arrangements,the optical bistability and multiple bistability of EBBA nematic liquid crystal films have been studied.The experiment was carried out with Ar + CW laser and samples of 60 μm thickness.The temperature dependence of the bistable and multiple bistable loops has been measured.The related mechanism of optical bistability in solid phase,nematic phase and phase transition of liquid crystalb.国家自然科学基金;福建省自然科学基

液晶低功率热光双稳态的研究

液晶低功率热光双稳态的研究周海光，陈书潮，吴河浚（厦门大学物理系，厦门361005）1987年，HuTCHIng提出将介质充满f-P腔中，与f-P腔反射面直接接触，利用f-P腔反射面的吸收，并将热量传到介质中从而产生热光双稳态，其临界人射功率可以下降..

Optical Bistability and Optical Limiting of Nonlinear Periodic Structure Media

本文借助f-P腔理论，推导出非线性周期结构介质中的入射光强与透射光强的解析表达式，分析和讨论了它的限光，双稳和非稳等特性，并指出液晶材料作为非线性介质的新的应用前景。An analytical expression between input and output light intensity in nonlinear periodic structure medium is deduced by means of the theory of F-P cavity The properties of its optical limiting,bistability and unstability are discussed.Fin ally,the new application possibility of liquid crystal as nonlinear material is pointed out.福建省自然科学基

Optical Bistability Concerning Multiple EFFects in F-P Cavity

提出一简单的理论模型用以f-P腔型的多种效应光学双稳态器件的最优化设计.给出影响光学双稳态的各种参数的最优化选择的理论解析表达式.以液晶为介质，按最优化设计制作的器件在实验上得到低达90μW/MM￣2的临界入射光强的光学双稳态.理论计算的临界光强与实验值相当一致A simple model employed to design optical bistability devices concerned mul-tiple eFFects in F-P cavity was proposed.Analytical expressions For optimum design of opticalbistability related to various parameters were presented.With liquid crystal as operation medium,optical bistability devices with threshold incident laser intensity as low as 90 μW/mm￣2 were ob-tained experimentally.The threshold light intensity of experiment was quite in agreement withthat of theoretical expectation

The Output Power Stability of Middle Intensity Lasers

强双稳态电光调制器具有最大的微分功率稳定S。S只由透过率T及偏压Vb决定，与控制电路放大因子g无关。利用lInbO3（ln）单45°混合型电光双稳态器件，对小发散角的近红外瓦级以下激光功率的稳定可能实现优化的技术设计。The intense bistable electro-optical modulator presents the maximum diFFerential stability of output power S.S only depends on transmittance T and bias Vb, and is independent of the magniFication Factor G of the controlling device.By using the single 45° LiNbO3 electro-optical hybrid bistable device,the optical design can be realized by the use of small divergent angle near-inFrared laser with power below 1 watt.福建省科委自然科学基