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Dec 2002

Volume 73, Issue 12, pp. 4057-4404

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back to top OPTICS; ATOMS and MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Frequency locking to a high-finesse Fabry–Perot cavity of a frequency doubled Nd:YAG laser used as the optical phase modulator

M. Bregant, G. Cantatore, F. Della Valle, G. Ruoso, and G. Zavattini

Rev. Sci. Instrum. 73, 4142 (2002); http://dx.doi.org/10.1063/1.1519933 (3 pages) | Cited 3 times

Online Publication Date: 21 November 2002

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We report on the frequency locking of a frequency doubled Nd:YAG laser to a 45 000 finesse, 87-cm-long, Fabry–Perot cavity using a modified form of the Pound–Drever–Hall technique. Necessary signals, such as light phase modulation and frequency correction feedback, are fed directly to the infrared pump laser. This is sufficient to achieve a stable locking of the 532 nm visible beam to the cavity, also showing that the doubling process does not degrade laser performances. © 2002 American Institute of Physics.
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42.60.Fc Modulation, tuning, and mode locking
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.55.Rz Doped-insulator lasers and other solid state lasers
42.79.Hp Optical processors, correlators, and modulators
FREE

A compact versatile femtosecond spectrometer

V. Nagarajan, E. Johnson, P. Schellenberg, W. Parson, and R. Windeler

Rev. Sci. Instrum. 73, 4145 (2002); http://dx.doi.org/10.1063/1.1518142 (5 pages) | Cited 15 times

Online Publication Date: 21 November 2002

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A compact apparatus for femtosecond pump–probe experiments is described. The apparatus is based on a cavity-dumped titanium:sapphire laser. Probe pulses are generated by focusing weak (∼1 nJ) pulses into a microstructure fiber that produces broadband continuum pulses with high efficiency. With the pump pulses compressed and probe pulses uncompressed, the rise time of the pump–probe signals is <100 fs. The 830 nm pump pulses are also frequency doubled to generate light for excitation at 415 nm. The versatility of the spectrometer is demonstrated by exciting molecules at either 830 or 415 nm, and probing at wavelengths ranging from 500 to 950 nm. Some results on the green fluorescent protein are presented. © 2002 American Institute of Physics.
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07.57.Ty Infrared spectrometers, auxiliary equipment, and techniques
07.60.Rd Visible and ultraviolet spectrometers
07.57.-c Infrared, submillimeter wave, microwave and radiowave instruments and equipment
07.60.-j Optical instruments and equipment
42.65.Re Ultrafast processes; optical pulse generation and pulse compression

Picosecond laser-pump, x-ray probe spectroscopy of GaAs

B. W. Adams, M. F. DeCamp, E. M. Dufresne, and D. A. Reis

Rev. Sci. Instrum. 73, 4150 (2002); http://dx.doi.org/10.1063/1.1516849 (7 pages) | Cited 6 times

Online Publication Date: 21 November 2002

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A laser-pump, x-ray probe spectroscopic experiment is described, and the results are shown. The Ga Kα x-ray fluorescence following x-ray absorption, at the Ga K absorption edge was measured, and its increase due to excitation with subpicosecond pulses of laser light at 4.6 eV photon energy was determined. The x-ray absorption, and thus the fluorescence, is increased for about 200 ps after the laser pulse because additional final states for the x-ray absorption are cleared in the valence band by the laser excitation. The technique could eventually lead to a femtosecond pump-probe spectroscopy with an absolute reference energy level and also to a femtosecond x-ray detector. This is of particular importance to future short-pulse x-ray sources, such as free-electron lasers. © 2002 American Institute of Physics.
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78.70.Dm X-ray absorption spectra
78.47.-p Spectroscopy of solid state dynamics
78.70.En X-ray emission spectra and fluorescence

An undulator-based spherical grating monochromator beamline for low energy electron-molecule scattering experiments

Søren V. Hoffmann, Stuart L. Lunt, Nykola C. Jones, David Field, and Jean-Pierre Ziesel

Rev. Sci. Instrum. 73, 4157 (2002); http://dx.doi.org/10.1063/1.1517143 (7 pages) | Cited 20 times

Online Publication Date: 21 November 2002

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A new synchrotron radiation undulator beamline, SGM2, with an energy range of 12–20 eV, has been commissioned on the ASTRID storage ring at the University of Aarhus. Using a spherical grating monochromator, the beamline is presently optimized for an energy of 15.76 eV (78.65 nm), for the 3p5(2P1/2)11s resonance in argon, for use in electron-molecule scattering experiments. Using this beamline in conjunction with an electron-molecule scattering apparatus, a beam of electrons down to kinetic energies of a few meV with a resolution of ∼1 meV full width at half maximum is routinely produced. © 2002 American Institute of Physics.
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07.85.Qe Synchrotron radiation instrumentation
07.77.-n Atomic, molecular, and charged-particle sources and detectors
34.80.Bm Elastic scattering
42.79.Dj Gratings

A single-photon detector for the measurement of optical activity in the deep sea

F. Ameli, M. Bonori, C. Coluzza, R. Masullo, M. Petruccetti, F. Massa, and L. Pappalardo

Rev. Sci. Instrum. 73, 4164 (2002); http://dx.doi.org/10.1063/1.1515359 (5 pages) | Cited 3 times

Online Publication Date: 21 November 2002

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A module was constructed for the measurement of deep sea optical activity at a sensitivity level of a single photoelectron. We describe the features of the module and a method for calibrating it. The average sensitivity in the interval from 350 to 500 nm is 0.89 Hz/(photons cm−2 s−1), where Hz is the rate detected by the module. © 2002 American Institute of Physics.
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93.85.-q Instruments and techniques for geophysical research: Exploration geophysics
85.60.Gz Photodetectors (including infrared and CCD detectors)
78.20.Ek Optical activity
06.20.F- Units and standards

Operation of a single mode external-cavity laser diode array near 780 nm

S. B. Bayram and T. E. Chupp

Rev. Sci. Instrum. 73, 4169 (2002); http://dx.doi.org/10.1063/1.1516848 (3 pages) | Cited 9 times

Online Publication Date: 21 November 2002

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We have narrowed the spectral bandwidth of a commercial 2 W laser diode array to be less than 120 MHz near 780 nm. The external-cavity laser diode array system is a standard double-pass Littman–Metcalf configuration operating on a dominant single longitudinal mode. © 2002 American Institute of Physics.
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42.55.Px Semiconductor lasers; laser diodes
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
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