KTP倍频晶体和可饱和吸收体在激光腔内综合锁模效应的实验研究

本文报道了我们把KTP倍频晶体和五甲川锁模染料溶液同时放在脉冲Nd:YAG激光器腔内进行激光锁模的实验研究情况。结果表明,它们对脉冲Nd:YAG激光器的综合锁模效果明显比它们各自单独锁模时的效果好,文中对它们的综合锁模作用机理进     

用非相干光光子回波技术测碘分子蒸汽的横向弛豫时间

本文用密度矩阵法推导出光子回波讯号强度与激光光脉冲相对延迟的一般关系,得出了二脉冲、三脉冲回波强度随延迟的变化公式。实验上用准分子激光器泵浦的可调谐染料激光器作为光源(其中心波长为4880A,线宽为0.1A,脉宽为10ns).分别利用二     

利用中空介质波导控制激光横模研究

本文提出并从实验上描述利用中空介质波导(即毛细管)控制激光横模的研究。将一个毛细管插入一个横向激励的染料激光谐振腔内的实验结果表明:高斯基模的振荡由于毛细管的导波作用得以加强。经过比较毛细管染料激光器与光阑染料激光器     

a-Si:H/a-SiNx:H多层膜的皮秒时间分辨光致发光

用时间分辨激光光谱学方法研究了a-Si:H/a-SiN_x:H多层膜光生载流子初始动力学过程,分析了非平衡载流子的热释和复合机制。实验还表明多层膜的发光衰减截止时间、迁移率边和带尾宽度随N含量呈非单调变化规律,转折发生在x=0.85附近,这很可能是由于不同N组份引起多层膜内电场和结构变化的结果。 关键词：     

TIME DECAY BEHAVIOR OF FULLERENE-C60 STUDIED BY TIME-RESOLVED PHOTOLUMINESCENCE

The time-resoved photoluminescence spectra of C₆₀ have been studied from toluence solution at room temperature and from thin film at both room temperature and 77K. A photoluminescence peak at about 730nm was detected from solution at room temperature and film at 77K, in which lifetimes waz determined to be 1.1 and 0.9ns, respectively. At room temperature, the photoluminescence peak of thin film shifted to 740 nm with fast decay behavior which was fitted well to a double-exponential lifetimes with τ₁ = 0.087ns, τ₂= 0.68 ns. Two relaxation mechanisms are given tentatively in explaining this phenomenon.     

Ce:KNSBN晶体中超短激光脉冲二波耦合和四波混频相位共轭

脉宽为50～60ps的超短激光脉冲列在Ce:KNSBN晶体中实现二波耦合和四波混频相位共轭。环境的微振动使二波耦合和四波混频相位共轭信号变得不稳定。当泵浦光脉冲从相对于探测光脉冲早到变为迟到时,二波耦合探测光信号从缩小变到放大。四波混频相位共轭信号出现双脉冲。晶体中存在纳秒光折变效应。     

Mn:KNSBN晶体在632.8nm处高读出效率全息存储及非常耦合系统

微瓦级的He-Ne激光束在掺Mn的KNSBN晶体中实现反射全息存储,最大读出效率达60%,实验中发现耦合系数一般地不为常数,在耦合系数为常数的范围内,测     

a-Si:H/a-SiN_X:H超晶格的瞬态光致发光

本文用超快速时间分辨光致发光方法研究了a-Si:H/a-SiN_x:H超晶格光生载流子热释和复合的动力学,揭示了超晶格发光衰减时间和带尾宽度随氮含量的非单调变化规     

OPTICAL STORAGE MECHANISM AND HIGH-ORDER DIFFRACTION PROPERTIES OF NITROAZOBENZENE-CONTAINING POLYESTER FILMS

Using Nd:YAG second harmonic pulse (100 ps), the optical storage proper-ties of two novel polyesters, poly [4'-bis (N, N-oxyethylene) imino-4-nitroazobenzene suc-cinyl] and poly [2'-chloro-4'-bis (N, N-oxyethylene) iminth-4-nitroazobenzene succiny] havebeen studied by multiwave mixing. The high-order diffractions of the orientation gratingsinduced by anisotropy via the reorientation of nitroazobenzene groups and optical infor-mation storage with long-term stability have been realized by multiwave mixing in theirfilms. Up to 3rd order forward diffraction was detected in two wave mixing, while up to 4thorder backward diffraction was observed in degenerated four wave mixing. The recordingmechanism was explained by the trans-cis-trans isomerization cycles of azobenzene groups.The isomerization of these azobenzene groups probably undergoes with inversion mecha-nism under the experimental conditions. The information recorded in these films has beenkept for more than 6 months.     

STUDIES ON THE DYNAMICS OF OPTICAL BISTABILITY SWITCHING IN THE INTERNAL FABRY-PEROT CAVITY WITH A CdSxSe1-x-DOPED GLASS CHANNEL WAVEGUIDE

We report the optical bistability in CdS_xSe_1-x-doped glass channel waveguide with rise and fall times of about 24 and 30ps, respectively, in bistable switching by means of fiber coupling input with a power of about 3mW. The third-order nonlinear susceptibility (x⁽³⁾) of CdS_xSe_1-x-doped glass is estimated experimentally to be 1.8×10^-9 esu. The high speed switching and the value of x⁽¹⁾ show that the optical bistability is caused by an optical nonlinearity which can be attributed to the band-filling effect.