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Review of Scientific Instruments Collection (61 Books)


 
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Review of Scientific Instruments : A frequency-stabilized differen...

By: Wen-Ping Deng, Bo Gao, Cun-Feng Cheng, Guo-Sheng Cheng, Shui-Ming Hu et al

Description: A midinfrared laser spectrometer is built up based on the difference frequency generation (DFG) of a Nd:YAG (yttrium aluminum garnet) laser and a tunable Ti:sapphire (Ti:Sa) laser. Tuning the Ti:Sa laser and operating properly with the periodically poled lithium niobate crystal, the DFG emission is tunable in the spectral range of 2.3–5.0 μm. The 1064 nm Nd:YAG laser frequency is stabilized to the 10−6 cm−1 level on a Doppler-broadened I2 absorption line at ...

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Review of Scientific Instruments : Cavity-dumped 2.70µm erbium las...

By: Young Ho Park, Dong Won Lee, Hong Jin Kong, and Yeong Sik Kim

Description: A cavity-dumped 2.70 μm erbium laser with a frustrated total internal reflection (FTIR) shutter was investigated and compared with a Q-switched erbium laser using the FTIR shutter. The Q-switched and the cavity-dumped 2.70 μm laser outputs were obtained with a dichroic coated mirror with high reflectance at 2.70 μm and high transmittance at 2.79 μm. For the Q-switched operation, a maximum peak power of 33.5 kW was achieved, and its pulse width was 1.3 μs. Fo...

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Review of Scientific Instruments : New versatile and linear optica...

By: Rémy Claverie, Jean Paul Salvestrini, Marc D. Fontana, and Pascal Ney

Description: This paper is devoted to the description and characterization of a new electro-optic sensor based on a polarimetric device operating in reflection mode, and on a closed-loop controller. The main features of the proposed sensor are versatility, insensitivity to the laser beam optical power fluctuation, and fully linear working mode. The resolution of the sensor, in terms of phase shift, is shown to be better than ±20 mrad and its accuracy to ±50 mrad.

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Review of Scientific Instruments : High-density, high-temperature ...

By: V. O. Lorenz, X. Dai, H. Green, T. R. Asnicar, and S. T. Cundiff

Description: We present a vapor cell design that enables resonant optical spectroscopy in high-density, high-temperature alkali metal vapors. Optical access is provided via reflection from the interface between the vapor and a sapphire window. The cell resists corrosion from the highly reactive alkali vapors, in our case, potassium, up to 800 °C (number densities up to 1019 cm−3). The cells maintain their integrity for an average of 100 h above 500 °C with about 10 heating/cooling cycles.

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Review of Scientific Instruments : Imaging piezospectroscopy

By: John B. Abbiss and Bauke Heeg

Description: A novel instrument is described for obtaining accurate high-resolution residual stress images of aluminum oxide materials, based on the piezospectroscopy of Cr3+ dopant ions. The instrument employs a charge coupled device camera, a narrow bandpass tunable filter and the use of Tikhonov regularization for reconstruction of the raw spectral data. The experimental accuracy and spectral shift resolution of this method were analyzed with two calibration light sou...

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Review of Scientific Instruments : High-resolution Rydberg tagging...

By: Brant Jones, Jingang Zhou, Lei Yang, and C. Y. Ng

Description: By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF...

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Review of Scientific Instruments : A time-resolved single-pass tec...

By: Jun Li, Xianming Zhou, and Jiabo Li

Description: An experimental method was developed to perform time-resolved, single-pass optical absorption measurements and to determine absorption coefficients of window materials under strong shock compression up to ∼ 200 GPa. Experimental details are described of (i) a configuration to generate an in situ dynamic, bright, optical source and (ii) a sample assembly with a lithium fluoride plate to essentially eliminate heat transfer from the hot radiator into the specim...

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Review of Scientific Instruments : Near UV-near IR Fourier transfo...

By: Xuzhu Wang, Robert K. Y. Chan, and Amelia S. K. Cheng

Description: A near UV-near IR Fourier transform spectrometer based on a beam-folding position-tracking method realized by using retroreflectors is reported. The use of retroreflectors maintains all beams in the beam-fold arrangement in parallel with the incident beams. The beam-folding interferometer used for position tracking is arranged to have optical path symmetry with the measurement interferometer in the zero path difference position of the measurement interferome...

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Review of Scientific Instruments : A new titration system of a nov...

By: Isao Kitagawa, Hideki Tanaka, Michiya Okada, Hitoshi Kitaguchi, and Takamitsu Kohzuma

Description: A new titration system for studying protein-ligand interactions has been developed. In this system, the sample solution is circulated in the route formed by an access path in a split superconducting magnet to maintain a constant protein concentration during the titration experiments. A concentration-control procedure for the ligand/protein ratio is devised, and the ligand/protein ratio is well controlled by this apparatus.

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Review of Scientific Instruments : A broadband absorption spectrom...

By: Justin M. Langridge, Stephen M. Ball, Alexander J. L. Shillings, and Roderic L. Jones

Description: A broadband absorption spectrometer has been developed for highly sensitive and target-selective in situ trace gas measurements. The instrument employs two distinct modes of operation: (i) broadband cavity enhanced absorption spectroscopy (BBCEAS) is used to quantify the concentration of gases in sample mixtures from their characteristic absorption features, and (ii) periodic measurements of the cavity mirrors’ reflectivity are made using step-scan phase shi...

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Review of Scientific Instruments : A newly designed single etalon ...

By: Dukhyeon Kim, Seongok Kwon, Hyungki Cha, Younggi Kim, and Jeonghaei Sunwoo

Description: A new optical Doppler lidar receiving system which can measure Doppler-shifted incoherent scattering light has been proposed and tested. This system functions in a manner similar to two edge filters and consists of a single etalon, a polarization beam splitter, and mirrors that can guide scattered light into a single etalon with two different angles. These two incident angles are precisely adjusted by the polarization beam splitter and mirrors. Using this op...

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Review of Scientific Instruments : A short working distance multip...

By: B. Dickinson, G. T. Seidler, Z. W. Webb, J. A. Bradley, K. P. Nagle et al

Description: For x-ray spot sizes of a few tens of microns or smaller, a millimeter-sized flat analyzer crystal placed ∼ 1 cm from the sample will exhibit high energy resolution while subtending a collection solid angle comparable to that of a typical spherically bent crystal analyzer (SBCA) at much larger working distances. Based on this observation and a nonfocusing geometry for the analyzer optic, we have constructed and tested a short working distance (SWD) multicrys...

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Review of Scientific Instruments : Scalable time-correlated photon...

By: Michael Wahl, Hans-Jürgen Rahn, Tino Röhlicke, Gerald Kell, Daniel Nettels et al

Description: Time-correlated single photon counting continues to gain importance in a wide range of applications. Most prominently, it is used for time-resolved fluorescence measurements with sensitivity down to the single molecule level. While the primary goal of the method used to be the determination of fluorescence lifetimes upon optical excitation by short light pulses, recent modifications and refinements of instrumentation and methodology allow for the recovery of...

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Review of Scientific Instruments : Simple two-dimensional-imaging ...

By: Martin Divoký and Petr Straka

Description: A minute, yet practical, modification of a well-known spectrograph based on a set of wedged narrow band filters is presented. It makes possible two-dimensional-imaging spectral measurements with a potential subpixel precision of a few micrometers. The simple spectroscopic device can evaluate dispersion of quantities which can be transformed into an image, e.g., into a spatial beam distribution. The spectrograph was used to measure angular dispersion of both ...

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Review of Scientific Instruments : Velocity map imaging in time of...

By: M. Brouard, E. K. Campbell, A. J. Johnsen, C. Vallance, W. H. Yuen et al

Description: A new variation on time of flight mass spectrometry is presented, which uses a fast framing charge coupled device camera to velocity map image multiple product masses in a single acquisition. The technique is demonstrated on two photofragmentation processes, those of CS2 and CH3S2CH3 (dimethyldisulfide) at a photolysis wavelength of 193 nm. In both cases, several mass fragments are imaged simultaneously, and speed distributions and anisotropy parameters are ...

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Review of Scientific Instruments : Transferring cold atoms in doub...

By: Junmin Wang, Jing Wang, Shubin Yan, Tao Geng, and Tiancai Zhang

Description: A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium atoms trapped in a vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) MOT by a continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity are adopted for the transfer laser beam, enhancement of the recapturing of atoms in the UHV MOT is clearly observed. Usin...

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Review of Scientific Instruments : A new spin-polarized photoemiss...

By: Taichi Okuda, Yasuo Takeichi, Yuuki Maeda, Ayumi Harasawa, Iwao Matsuda et al

Description: A new spin- and angle-resolved photoemission spectrometer was developed adopting the very-low-energy-electron-diffraction (VLEED)-type spin polarimeter. The Fe(001)p(1×1)–O film grown on MgO(001) crystal for the VLEED target yields significantly high spin-resolving power, the effective Sherman function of 0.40±0.02, with long lifetime and stability compared to the conventional Fe(001) target. Under the favor of high resolving power, approximately 100 times h...

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Review of Scientific Instruments : Simulation and analysis of sole...

By: A. R. Alderwick, A. P. Jardine, H. Hedgeland, D. A. MacLaren, W. Allison et al

Description: We present a detailed analysis and simulation of solenoidal, magnetically confined electron bombardment ion sources, aimed at molecular beam detection. The aim is to achieve high efficiency for singly ionized species while minimizing multiple ionization. Electron space charge plays a major role and we apply combined ray tracing and finite element simulations to determine the properties of a realistic geometry. The factors controlling electron injection and i...

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Review of Scientific Instruments : Design and characterization of ...

By: Gautam Sinha and Gurnam Singh

Description: This paper presents the design and analysis of a multipurpose combined function magnet for use in accelerators. This magnet consists of three corrector magnets: (i) skew quadrupole, (ii) horizontal dipole, and (iii) vertical dipole magnets, along with the main sextupole magnet. The strength of the corrector magnets is smaller than that of the main sextupole magnet. The strength of all the four magnets can be varied independently. The excitation strength requ...

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Review of Scientific Instruments : Correction of spherical aberrat...

By: Alexander Pikin and Ahovi Kponou

Description: Two methods to correct spherical aberration in electrostatic gridded lenses have been studied using ray-tracing simulations. Both methods are based on modifying the electrostatic field on the radial periphery of the lens. In the simplest case, the modification is done by extending the grid support axially. In the second method, the electric field on a radial periphery of the lens is modified by applying optimum voltage on an isolated correcting electrode. It...

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