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    • 6. 发明授权
    • Diode-pumped power build-up cavity for chemical sensing
    • 用于化学传感的二极管泵浦功率积聚腔
    • US5432610A
    • 1995-07-11
    • US228317
    • 1994-04-15
    • David A. KingWilliam F. CarlsenDamien F. GrayRichard J. Pittaro
    • David A. KingWilliam F. CarlsenDamien F. GrayRichard J. Pittaro
    • G01N21/01G01N21/65H01S3/082H01S5/14G01N21/00H01S3/098
    • G01N21/65H01S5/14H01S3/082H01S5/141
    • A semiconductor laser power build-up system includes a semi-conductor laser. An optical resonance cavity is defined between at least two reflective elements and has an intracavity light beam along an intracavity beam path. A return light beam, which is a portion of the intracavity light beam, is transmitted through one of the reflective elements and is coincident with but oppositely directed relative to the incident beam. The laser is wholly optically locked to the cavity and the intracavity beam passes substantially without loss within the cavity. In a preferred application, a sample is placed in the cavity and a detector is provided to sense chemicals in the sample by, for example, detecting Raman-scattered light. A wavelength-determining element such as a grating or an etalon is preferably in the incident beam path between the laser and the cavity. The reflective elements can have very low transmission losses, an emission facet of the laser can have very low reflectivity, and feedback into the laser may be strong, for example, above 3%. When the laser is a diode laser, the invention provides for driving the diode laser with a current that is less than its bare-diode threshold current.
    • 半导体激光发电系统包括半导体激光器。 在至少两个反射元件之间限定光学谐振腔,并且具有沿着腔内光束路径的腔内光束。 作为腔内光束的一部分的返回光束通过反射元件中的一个透射并且相对于入射光束重合而相反地定向。 激光器完全光学地锁定到空腔,并且腔内光束在腔内基本上没有损失。 在优选的应用中,将样品放置在空腔中,并且提供检测器以通过例如检测拉曼散射光来感测样品中的化学物质。 诸如光栅或标准具的波长确定元件优选地在激光器和空腔之间的入射光束路径中。 反射元件可以具有非常低的传输损耗,激光器的发射小面可以具有非常低的反射率,并且反射到激光器中可能是强的,例如高于3%。 当激光器是二极管激光器时,本发明提供了驱动二极管激光器的电流小于其二极管二极管阈值电流。
    • 9. 发明授权
    • System for collecting weakly scattered electromagnetic radiation
    • 用于收集弱散射电磁辐射的系统
    • US5506678A
    • 1996-04-09
    • US840108
    • 1992-02-24
    • William F. CarlsenTad D. SimonsRichard J. PittaroGeorge W. Hopkins, IIDamien F. Gray
    • William F. CarlsenTad D. SimonsRichard J. PittaroGeorge W. Hopkins, IIDamien F. Gray
    • G01J3/44G01N21/03G01N21/51G01N21/65G01N21/00
    • G01N21/65G01N21/03G01N21/51G01N2021/0314G01N2021/513
    • A System for Collecting Weakly Scattered Electromagnetic Radiation is disclosed. The present invention overcomes problems suffered by previous collection systems by providing a reliable and efficient device for intensifying and collecting the scattered radiation generated by laser induced scattering. The present invention employs a laser source which illuminates an unknown gas contained by a long hollow tube having a highly reflective sheathing. The illuminating electromagnetic radiation from the laser is directed along the entire length of the tube and collides with the molecules of the unknown gas in the tube. The collisions cause the emission of weakly scattered electromagnetic radiation that is shifted in reference to the illuminating radiation. The sheathing is sufficiently reflective of the scattered radiation to substantially contain it. An exit is coupled to the long hollow tube in such a way that the scattered radiation may pass from the reflective sheathing and be collected for analysis. The scattered radiation that is collected may be used in conjunction with conventional spectrometry devices to provide a reliable and rapid determination of the composition and concentration of a wide range unknown gasses. The system may also be used to analyze a wide range of other scattering medium.
    • 公开了一种收集弱分散电磁辐射的系统。 本发明通过提供用于增强和收集由激光诱导散射产生的散射辐射的可靠且有效的装置来克服先前的收集系统所遭受的问题。 本发明采用照射由具有高反射率护套的长中空管所包含的未知气体的激光源。 来自激光器的照明电磁辐射沿着管的整个长度被引导并与管中未知气体的分子碰撞。 碰撞引起相对于照射辐射偏移的弱散射电磁辐射的发射。 护套足以反射散射的辐射以基本上容纳它。 出口耦合到长的中空管,使得散射的辐射可以从反射护套传播并被收集用于分析。 所收集的散射辐射可以与常规光谱测定装置结合使用,以提供对广泛范围的未知气体的组成和浓度的可靠且快速的测定。 该系统也可用于分析各种其他散射介质。