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Jan 2009

Volume 80, Issue 1, Articles (01xxxx)

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A vapor cell based on dispensers for laser spectroscopy

E. M. Bridge, J. Millen, C. S. Adams, and M. P. A. Jones

Rev. Sci. Instrum. 80, 013101 (2009); http://dx.doi.org/10.1063/1.3036980 (3 pages) | Cited 4 times

Online Publication Date: 6 January 2009

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We describe a simple strontium vapor cell for laser spectroscopy experiments. Strontium vapor is produced using an electrically heated commercial dispenser source. The sealed cell operates at room temperature, and without a buffer gas or vacuum pump. The cell was characterized using laser spectroscopy, and was found to offer stable and robust operation, with an estimated lifetime of >10 000 h. By changing the dispenser, this technique can be readily extended to other alkali and alkaline earth elements.
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07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques

Automatic beam alignment system for a pulsed infrared laser

L. Kral

Rev. Sci. Instrum. 80, 013102 (2009); http://dx.doi.org/10.1063/1.3058604 (5 pages) | Cited 3 times

Online Publication Date: 7 January 2009

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A fully automatic alignment system for a pulsed infrared laser beam (5 ns pulses, 10 Hz repetition rate, 1.3 μm wavelength) was developed and tested. It compensates for long-term fluctuations of the beam initial position and direction—the automatic realignment is performed every 10 min, and lasts typically 1–2 min. The system adjusts the beam initial position with a maximum error of 0.5 mm (10% of the beam diameter) and the beam direction with a maximum error of 50 μrad. The solution is based on two InGaAs quadrant photodiodes as the position detectors and two motorized mirrors controlled by a personal computer. The signals from the quadrant detectors are processed by a peak detector and digitized by an analog to digital converter, which is synchronized with the laser pulses.
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42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
42.15.Eq Optical system design
07.05.Dz Control systems
85.60.Dw Photodiodes; phototransistors; photoresistors
42.87.-d Optical testing techniques
85.60.Gz Photodetectors (including infrared and CCD detectors)

Cryogenic ion trapping systems with surface-electrode traps

P. B. Antohi, D. Schuster, G. M. Akselrod, J. Labaziewicz, Y. Ge, Z. Lin, W. S. Bakr, and I. L. Chuang

Rev. Sci. Instrum. 80, 013103 (2009); http://dx.doi.org/10.1063/1.3058605 (9 pages) | Cited 11 times

Online Publication Date: 7 January 2009

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We present two simple cryogenic rf ion trap systems in which cryogenic temperatures and ultra high vacuum pressures can be reached in as little as 12 h. The ion traps are operated either in a liquid helium bath cryostat or in a low vibration closed cycle cryostat. The fast turn around time and availability of buffer gas cooling made the systems ideal for testing surface-electrode ion traps. The vibration amplitude of the closed cycled cryostat was found to be below 106 nm. We evaluated the systems by loading surface-electrode ion traps with 88Sr+ ions using laser ablation, which is compatible with the cryogenic environment. Using Doppler cooling we observed small ion crystals in which optically resolved ions have a trapped lifetime over 2500 min.
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37.10.Ty Ion trapping
37.10.Rs Ion cooling
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment

A modified commercial scanner as an image plate for table-top optical applications

S. Casado-Rojo, H. E. Lorenzana, M. Cáceres, and V. G. Baonza

Rev. Sci. Instrum. 80, 013104 (2009); http://dx.doi.org/10.1063/1.3065027 (5 pages)

Online Publication Date: 12 January 2009

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A reliable, accurate, and inexpensive optical detector for table-top applications is described here. Based on a commercial high resolution office scanner coupled to a projection plate, the detector offers a large image plate surface, allowing recording of sizeable images without systematic errors associated with coupling optics aberrations. Several tests on distance-dependent and steady interference patterns are presented and discussed. The extension to other types of optical measurements by substituting the projection plate is proposed.
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42.79.Ls Scanners, image intensifiers, and image converters
42.15.Fr Aberrations
42.79.Pw Imaging detectors and sensors
07.60.Ly Interferometers

Advanced intensity correlation method for evaluating Poisson’s ratio of fiberlike material

Zhenxing Hu, Huimin Xie, Tao Hua, and Zhaoyang Wang

Rev. Sci. Instrum. 80, 013105 (2009); http://dx.doi.org/10.1063/1.3073966 (5 pages) | Cited 3 times

Online Publication Date: 27 January 2009

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An advanced intensity correlation method for evaluating Poisson’s ratio of fiberlike materials is presented. The method is based on wave diffraction theory and digital image correlation (DIC) analysis. With the new method, the transverse strain of the fiberlike specimen under stretch can be conveniently and accurately determined by fitting the DIC-measured deformation distributions as a straight line following the theoretical diffraction model. The validity and flexibility of the method have been verified by numerical simulations and an experiment. The method can be readily extended to the characterizations of many fiberlike materials.
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81.70.-q Methods of materials testing and analysis
42.30.Va Image forming and processing
81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.dj Poisson's ratio
81.40.Lm Deformation, plasticity, and creep
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