振-放交迭独立调谐的双波长激光器

报道了一种新型的双波长激光器,它的两个波长的振荡和放大通过一个半反镜M的耦合而相互交叠。 该器件具有多方面的优越性:无需附加腔内分割元件;两个波长可以完全独立调谐而无相互牵制;两个波长的激光输出既可以是共线的,也可以是分离的;可以消除或控制模式竞争;提高了染料激光的转换效率;压低了荧光背景;改善了激光束质量。此外,两个波长可以运转在一种染料中,也可以分别运转在两种染料中。后者,两个波长之差不受一种染料增益谱宽的限制。     

掺入物对染料激光器的影响

一、前言闪光灯激励的染料激光器的持续工作时间越长,激光器的效率就越低,用于振荡的阈值能量便增加。激光效率的显著降低,对激光的应用是一个致命的打击。为此,需寻找一种方法来改善现状。作为改善的方法是在染料溶液里附加适当的掺入物。经过努力提出了一种染料混合法,即在一种染料的溶液里加入另一种染料,这种加入的激励染料引起的能量转移可增加激光染料的发光强度。采用染料混合法,不仅能增加激光输出和减低阈值,而且还能产生波长的改变。尤其是振荡波长的改变十分有助于扩大激光的调谐范围。在某特定的光谱区域里,即使没有与之相适应的发光染料也无关紧要,只要改变波长就能得到补偿。不过,染     

甲酚紫连续波染料激光器获得近40毫瓦输出

有机染料激光器是一种重要的可调谐相干光源。它以荧光染料作为工作物质,用闪光灯、氮分子激光器、倍频的钇铝石榴石激光器、准分子激光器、铜蒸汽激光器、较高功率的氩或氪离子激光器作泵浦源。染料产生的荧光波长比泵浦波长稍长一些(称为斯托克斯位移),当满足一定的物理条件后,这种荧光就能转变为激光。其激光作用可以出现在强荧光的任何波长上。由于染料的荧光谱带很宽,因此染料激光作用的可能范围也很宽。只要我们适当地选择几种染料,并采用某些调谐元件,就可以使激光波长在宽广的光     

激光波长可交替变换的染料激光器

本文主要介绍一种激光输出波长可交替变换的染料激光器．该染料激光器的泵浦源是脉冲Nd：YAG激光器的3次谐波．输出波长为0．355μm，脉冲宽度为10ns；重复频率为10Hz，激光能量为5～30mJ．该染料激光器的光学结构（光路图略）是采用光栅调谐、棱镜扩束、振荡级染料池、输出腔镜及放大级染料池等组成．0．355μm的Nd：YAG激光通过柱镜镜组泵浦在两级染料池上，经振荡、放大，产生所要求的染料激光．为获得染料激光输出的不同波长的交替变换，则是在上述染料激光器光路系统中播人一个波长选择器组件，这种波长选择器就是一个旋转的棱镜组…     

354.7 nm的产生及其泵浦的可调谐染料激光器

用和频的方法从Nd:YAG激光器中产生出三次谐波,输出功率为1.7兆瓦,并用它泵浦了染料激光器。染料激光的波长可调谐范围为409.3～682.3 nm。Coumarin47染料的中心波长450.0 nm处的峰值功率大于0.60兆瓦。仅用Coumarin152一种染料,调谐范围宽达104.2 nm,与其荧光谱线宽度120.0 nm相近。     

3547埃的产生及其泵浦的可调谐染料激光器

用和频的方法从Nd:YAG激光器中产生出三次谐波,输出功率为1.7兆瓦,并用它泵浦了染料激光器。染料激光的波长可调谐范围为4093～6823。Coumarin47染料的中心波长4500处的峰值功率大于0.60兆瓦。仅用Coumarin152一种染料,调谐范围宽达1042,与其荧光谱线宽度1200相近。     

全息激光雷达

本文叙述一种全息激光雷达。该装置用波长0.55～0.6μm之间可变的氩激励染料激光器作光源,用两个标准量具进行波长宽     

独立调谐的双波长可调谐染料激光器

设计了一种双波长染料激光器,它的特点是腔内运输的两激光波长可以独立地调谐,并且它们是互相正交偏振的。 用YAG激光的二次谐波作泵浦源,染料为R6G的甲醇溶液,所得实验结果如下: (1)用R6G甲醇溶液,输出两激光波长可在560～620nm连续独立地调谐,且两波长为互相正交的线偏振光。     

双染料敏化的光致聚合物全息特性研究

报道了一种新型、双染料共同敏化的光致聚合物材料,该材料以丙稀酰胺和双丙稀酰胺作为单体,聚乙烯醇为聚合物基质,两种染料曙红Y和亚甲基蓝作为光引发剂.实验结果表明,该材料在四种波长的激光照射下,其最大衍射效率均不低于25%,最大可达54.8%.通过采用多波长存储技术,分别利用四种不同波长的光在该聚合物膜上同一位置存储了四幅不同的图像,取得一定的效果.     

桑迪亚成功试验紫外新染料

桑迪亚国家实验室研究人员报导，他们已成功地试验了一种新型紫外染料Fxalite 392E其连续激光运转波长在373~408 nm之间。以前不用倍频技术只用Polypheyl 1染料曾达到392 nm以下的连续运转。新染料由俄亥俄州Exciton化学公司制造,改进染料溶液制备可有较髙功率。     

钕激光器锁模用的五甲川染料

本文给出了钕激光器锁模用的五甲川染料的物理、化学和锁模特性。找出了影响溶于1,2-二氯乙烷的五甲川染料溶液稳定性的因素。提出了一种提高染料稳定性的方法。和十一甲川染料相比,五甲川染料是一种廉价而好的锁模染料。     

XeCl准分子激光泵浦的无腔染料激光器和紫外-可见波段调谐染料激光器

（一）无腔染料激光器 一、引言 不使用共振腔便能得到强受激发射的光通称为放大自发辐射NIASE，一般也叫超辐射或超荧光。它是自发辐射在已形成粒子数反转分布的高增益激活介质中沿激活区轴向传播时通过感应发射过程依次行波放大所产生的。     

Injection-locked dye laser pumped by a xenon-ion laser

Injection locking of a dye laser is reported for a 4-mirror ring-cavity dye laser pumped by a xenon-ion laser. Both a He-Ne laser and tunable CW dye laser were used as the injection sources.     

A compartment model for fluorometric indication of tissue perfusion

Sodium fluorescein is an in vivo blood perfusion indicator for soft tissue. When fluorescein dye is introduced into the blood, it distributes throughout the vasculature and the extravascular space. Incident light from an external source causes the dye to fluoresce, the level of which is monitored by a photodetector placed over the tissue. In this study, theoretical analysis incorporating a multicompartmental model for dye distribution is applied to describe the relationship among perfusion, dye kinetics, and fluorescence readings. Errors in calculating perfusion from fluorescence are related to dye concentrations and to measurement errors. These error sources are minimized by selecting the measurement time. The alternatives of measurement during wash-in or during wash-out of dye are compared, as well as the alternatives of introducing dye by bolus injection or by constant infusion. Compensation of wash-in measurements for differences in skin pigmentation is accomplished by the matching of skin optical properties between incident and fluorescing wavelengths. A laboratory study at 80 measurement sites (from ten graded perfusion canine flaps) demonstrated a correlation of wash-in and wash-out perfusion data ranging from 0.88 to 0.96 at typical levels of fluorescein in blood. Since wash-in can be completed in a matter of a few minutes, this is likely to be preferable in the clinical setting to wash-out which can take much longer to complete.     

Nanoparticle/Dye Interface Optimization in Dye‐Sensitized Solar Cells

A critical component in the development of highly efficient dye‐sensitized solar cells is the interface between the ruthenium bipyridyl complex dye and the surface of the mesoporous titanium dioxide film. In spite of many studies aimed at examining the detailed anchoring mechanism of the dye on the titania surface, there is as yet no commonly accepted understanding. Furthermore, it is generally believed that a single monolayer of strongly attached molecules is required in order to maximize the efficiency of electron injection into the semiconductor. In this study, the amount of adsorbed dye on the mesoporous film is maximised, which in turn increases the light absorption and decreases carrier recombination, resulting in improved device performance. A process that increases the surface concentration of the dye molecules adsorbed on the TiO₂ surface by up to 20% is developed. This process is based on partial desorption of the dye after the initial adsorption, followed by readsorption. This desorption/adsorption cycling process can be repeated multiple times and yields a continual increase in dye uptake, up to a saturation limit. The effect on device performance is directly related and a 23% increase in power conversion efficiency is observed. Surface enhanced Raman spectroscopy, infrared spectroscopy, and electrochemical impedance analysis were used to elucidate the fundamental mechanisms behind this observation.     

Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica

In this study, it is shown that the kinetics of the back‐switching reaction of a photochromic spirooxazine dye encapsulated in mesoporous silica materials can be significantly influenced both by the space available to the dye molecules and by the functionalization of the silica wall. Steric hindrance of the ring‐closing process due to high dye content or small pore size leads to a slow fading speed of the irradiated dye species. Further, the density of surface silanol‐groups present at the silica walls has an effect on the switching behavior of the dye because of their ability to stabilize the zwitterionic merocyanine isomers, thereby slowing the fading process from the open to the closed form. This stabilization effect is further enhanced in the presence of acidic functional groups, while, in contrast, basic functional groups reduce the stabilization of the open‐from dye isomers, and thus a faster decay of the irradiated species is observed. Control over the fading speed of photochromic dyes is interesting for applications requiring a particularly fast or slow fading speed.     

激光功率密度对低浓度若丹明6G染料激射寿命的影响

把固体染料激光器工作介质激射寿命的概念推广到液体染料激光器中,同时提出了一种针对液体激光染料激射寿命的双激光光路测试方法.该方法使用波长为532 nm的Nd:YAG脉冲激光器作为抽运光来模拟染料激光器中的抽运条件,用波长相同的低功率连续激光作为监测染料分子在抽运光作用下失效速率的手段.利用半导体制冷器件,PID温控仪和水浴槽实现了液体染料的恒温控制.测量了激光平均功率密度从6.3×103～2.2×104 W/m2变化范围内R6G染料乙醇溶液的激射寿命.实验结果表明,染料的激射寿命与抽运光功率密度成反比,比例系数可以解释为染料分解一半时,分子单位吸收截面上累积的辐照能量.用该系数表征染料的激射寿命特征更具有普遍意义.     

Electrochemical analysis of dye adsorption on aligned carbon nanofiber arrays coated with TiO2 nanoneedles for dye-sensitized solar cell

An electrochemical method has been developed to analyze dye absorption on the aligned carbon nanofiber arrays coated with TiO2 nanoneedles for dyesensitized solar cell. The unique nanostructure with the roughness factor of 90.6 provides a large effective surface area for dye adsorption. The experimental results showed that the dye molecules cover 39.7% of the TiO2 surface area which influences the performance of dye-sensitized solar cell. The electrochemical method provides the information of the coverage of dye molecules which is a key issue to optimize solar cell performance.     

以脉冲氙离子激光器为泵浦和注入光源的注入锁定染料激光器

描述了一个注入锁定的染料激光器,它是用脉冲氙离子激光器泵浦的若丹明6G四镜环形染料激光器,并且用氙离子激光输出线中的5960?作为注入光源、研究了注入锁定染料激光器的输出强度和光谱特性.     

新型锁模激光染料池

染料池是锁模激光器的关键元件之一.本文简略地介绍了一种经过精心设计的新型锁模激光染料池的特点及结构.该新型染料池在国内若干单位应用均获得满意的结果.该染料池已成为发明专利产品并有小批量产品.