CO2激光传输用锥形波导耦合器的设计、制备及其性能研究

针对CO2激光传输用空芯波导的特点，设计、制各了锥形空芯波导耦合器系统。对此耦合系统的传输性能测试表明，使用该锥形空芯波导耦合器能够显著提高空芯波导的激光传输性能。     

固体激光染料—掺杂复合薄膜制备及其光谱性质

用ＭＴＥＳ，ＭＴＭＳ和ＴＥＯＳ为共先驱体，采用溶胶－凝胶工艺放置法在载玻片上制备了掺激光染料Ｒｈｏｄａｍｉｎｅ ６Ｇ，Ｐｙｒｉｄｉｎｅ－１，Ｐｙｒｅｎｅ和Ｃｏｕｍａｒｉｎ的有机复合薄膜。观察分析了凝胶形成过程的分相及干燥过程的开裂现象。     

激光减反射膜制备技术展望

介绍了激光减反射膜的需求，激光减反射膜的作用原理，溶胶－凝胶法技术４的发展历史，制备工艺以及性能测试，并对存在的问题作了简要说明。     

溶胶—凝胶法基本原理及其在陶瓷材料中的应用

概述了溶胶－凝胶法的基本原理及其在陶瓷材料中的应用。首先强调了溶胶体系的稳定性原理和溶胶－凝胶体系的制备过程（包括金属盐－水溶胶和金属醇盐－醇溶胶）。对于溶胶－凝胶法在陶瓷材料中的应用作了详细的比较和评价，并着重从工艺上介绍了一些应用实例，其中包括金属氧化物的微球、超细颗粒、涂层、薄膜以及连续陶瓷纤维。     

溶胶—凝胶法的研究和应用现状

简述了溶胶－凝胶法的基本原理，全面概述了溶胶－凝胶法的研究和应用现状，已有的研究表明，此法是一种有前途的制备新型材料的新方法，指出了今后溶胶－凝胶法研究的方向。     

金属表面Sol-gel法制备耐腐蚀陶瓷涂层的研究进展

综述了溶胶－凝胶涂层的成膜原理，制备工艺，比较了溶胶－凝胶法与其它金属陶瓷涂层的制备工艺，讨论了溶胶－凝胶涂层对金属耐磨腐蚀性能，耐磨性能的改进及在腐蚀防护领域中的应用，还对溶胶－凝胶涂层技术的发展的提出了看法。     

锐钛矿型TiO2纳米粉的低温热容研究

采用溶胶－凝胶法制备了１６、２６nm锐钛矿型ＴiO2纳米晶超微粉末,测定了其纳米尺寸和记,在７８－３７０Ｋ温区测定了热容、拟合出热容随温度变经的多项式方程,并与锐态矿型粗晶ＴiO2热容文献值进行分析,从能量不同的角度分析了各曲线不同的原因。     

TiO2-SiO2系统凝胶玻璃薄膜折射率的研究

应用光度法研究了溶胶－凝胶系统组成、热处理温度对iO2-SiO2系统凝胶玻璃薄膜折射率的影响规律。随薄膜中TiO2含量的增加以及热处理温度的升高，薄膜的折射率逐渐增大。通过调整TiO2-SiO2系统的组成及适当的热处理温度，可实现TiO2-SiO2系统薄膜折射率在1．5－2．4之间的连续变化。     

稀土发光材料的研究与展望

简要介绍了稀土发光材料的发光原理和八种制备方法，包括传统的高温固相反应法溶胶-凝胶法、水热合成法、低温燃烧合成法、化学沉淀法、微波辐射法、电弧法、CO2激光加热气相沉积合成法，总结了每种制备方法的优缺点，并对稀土发光材料的应用和发展前景进行了展望。     

碳化硅内膜空芯传能光纤的研究

为了改进空芯传能光纤对10．6μm处CO2激光的传输性能，研制了具有SiC内膜的新型空芯玻璃波导，利用SEM和FTIR等技术分析了反应条件对sic膜层结构、物相的影响，并测试了光纤的性能．结果表明：温度是影响SiC膜层的重要因素；制得的孔径为950μm，长为2．5m的SiC传能光纤理论损耗约为0．7dB／m，实际传输损耗为0．74dB／m；SiC的吸收蜂有蓝移现象．     

介质(Ag/AgI)镀层空芯玻璃光纤的制备及红外传输性能的研究

介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤是一种较好的传输红外激光的柔性光纤材料．采用液相化学沉积法成功地制备了内径分别为１．０、０．５３、０．３２ｍｍ,长度为１．５ｍ的介质（Ａｇ／ＡｇＩ）镀层玻璃空芯光纤．利用傅里叶红外光谱仪和 ＬＪＬ－３５Ａ ＣＯ_２激光器分别测试了介质（Ａｇ／ＡｇＩ）镀层玻璃空芯光纤的传输损耗,测试结果表明：介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤在２．５～２０μｍ波长范围内有较低的损耗值;随着光纤内径（α）的增大,空芯光纤的传输损耗（α）降低,这与Ｍｉｇａｇｉ理论（α　∝１／α^３）相符合．另外,由于光纤的注入端头发热致使介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤的传输损耗随注入功率的增加而增大．     

Fabrication of hollow waveguides for CO2 lasers

Germanium-coated metal (silver, gold, and copper) hollow waveguides for CO(2) laser energy delivery have been fabricated by electron-beam evaporation and plating techniques in which an acid-soluble glass mandrel with small surface roughness was used. The transmission characteristics of Ge-coated metal hollow waveguides were studied. Ge-coated Ag hollow waveguides showed smaller loss, 0.2 dBm, for CO(2) laser light than Ge-coated Au and Cu waveguides. The transmission characteristics of Ge-coated Ag hollow waveguides were measured in relation to a core diameter and a bending radius.     

Thickness and uniformity of fluorocarbon polymer film dynamically coated inside silver hollow glass waveguides

The variation in properties of a fluorocarbon polymer (FCP) film during a drying-curing process is investigated for fabricating FCP-coated silver (FCP/Ag) hollow glass waveguides. A dynamic liquid-phase coating procedure is used. Through the analyses of the loss spectra of hollow waveguides made in various conditions, a relationship between the thickness of the FCP film and the coating velocity is obtained. The optimum fabrication condition is also established for producing FCP/Ag hollow glass waveguides for the mid-IR.     

Cyclic olefin polymer-coated silver hollow glass waveguides for the infrared

Cyclic olefin polymer (COP) is newly used as the inner dielectric of infrared, hollow glass waveguides because of its low extinction coefficient in the mid-infrared region. A liquid-flow coating and dry-cure process are employed to form the COP layer on the inside of a silver-coated hollow glass tube. In the coating process, cyclohexane is chosen as the solvent of COP to form a smooth and uniform COP layer. It is shown that COP-coated silver hollow glass waveguides show low loss properties for CO(2), CO, and Er:YAG laser light when the thickness of the COP layer is properly chosen.     

High-peak-power, pulsed CO(2) laser light delivery by hollow glass waveguides

Flexible hollow glass waveguides with internal metallic and dielectric coatings have been used to deliver high-peak-power transversely excited atmosphere CO(2) laser energy. The straight guide loss is as low as 0.17 dB/m for 1000-mum-bore guides and 0.46 dB/m for 530-mum-bore guides propagating the HE(11) mode. The loss increases to 0.93 and 1.36 dB/m, respectively, when guides are bent to a radius of 0.25 m. The hollow glass waveguides have been used to deliver pulsed CO(2) laser energy successfully with a peak power of 0.7 MW and an energy of 350 mJ per pulse with a gas purge through the hollow core. The delivered average power is as high as 27 W. It is concluded that these waveguides are promising candidates for pulsed CO(2) laser delivery in medical and surgical applications.     

传输紫外激光用空芯光纤结构设计

对传输紫外激光用空芯光纤结构进行了研究.铝膜是从紫外到红外都有很高反射率的理想材料,用它来研制的空芯光纤的直线损耗和弯曲损耗均较小.在铝膜上涂覆设计厚度的低折射率膜可进一步提高系统的反射率,增加传输效率,并保护铝膜免受大气侵蚀.     

Controlling the dynamic behavior of piezoceramic cylinders by cross-section geometry

This paper focuses on the possibilities of controlling the dispersion spectra and wave characteristics of cylindrical waveguides by changing their geometry and electro-elastic properties. We consider cylinders with classical circular and hollow cross-sections, and waveguides that have sector cut of arbitrary angular measure in the cross-section. Numerical results are presented for the cylinders of all studied types with different boundary conditions. It is shown that the required wave characteristics can be obtained by a variation of the cross-section geometry of the waveguides.     

AgI-coated silver-clad stainless steel hollow waveguides for infrared lightwave transmission and their applications

We fabricated silver iodide (AgI)-coated silver hollow waveguides to transmit a wide range of infrared (IR) light. Silver-clad stainless steel pipes were used as a supporting pipe. Since this type of metallic hollow waveguide has high mechanical strength and heat resistance, it is suitable as a rigid lightwave probe for various applications such as dental or medical laser treatment, IR spectroscopy, thermal radiometry, and laser processing. Considering these applications, we estimated the hollow waveguides with different thicknesses of the AgI layer. By optimizing the AgI layer thickness according to the wavelength of propagating light, we succeeded in efficiently transmitting Er-YAG and CO(2) laser light. We also studied the optical characteristics of a wide range of incoherent light for IR spectroscopy and radiometry applications using these metallic hollow waveguides as lightwave probes.     

Ray-optic analysis of the (bio)sensing ability of ring-cladding hollow waveguides

Ray-optic analysis of transmission spectra and the leakage loss of ring-cladding hollow waveguides suggests that such waveguides offer an attractive platform for the creation of compact and efficient biochemical sensors and sensor arrays. The ring cladding in such waveguides serves as a built-in Fabry-Perot interferometer, allowing the detection of few-nanometer-thick molecular layers and ensuring a high sensitivity of transmission spectra of waveguide modes to small changes in the refractive index of an analyte filling the hollow core and air holes in the waveguide cladding.     

Hollow-waveguide delivery systems for high-power, industrial CO(2) lasers

Hollow-sapphire and metal-dielectric-coated hollow-glass waveguides have been used to deliver CO(2) laser power for industrial laser applications. The transmission, bending loss, and output-beam properties of these waveguides are described. The bore sizes of the hollow-sapphire waveguides were 1070 and 790 μm, and the hollow-glass waveguide had a bore of 700 μm. The waveguides ranged in length from 1.1 to 1.5 m. The sapphire waveguides were bent to 90°, and the hollow-glass waveguides were bent into a full 360° loop. We delivered a maximum of 1.8 kW through the 1070-μm-bore sapphire waveguide and 1.0 kW through the hollow-glass waveguide. All the hollow waveguides incorporated a water jacket to prevent overheating.