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Review of Scientific Instruments / Volume 68 / Issue 9

Rev. Sci. Instrum. 68, 3296 (1997); http://dx.doi.org/10.1063/1.1148287 (5 pages)

Rapid-scanning interferometer for ultrafast pump–probe spectroscopy with phase-sensitive detection

William M. Diffey and Warren F. Beck

Department of Chemistry, Vanderbilt University, 5134 Stevenson Center, Nashville, Tennessee 37235

(Received 18 March 1997; accepted 30 June 1997)

We describe a rapid-scanning modified Mach–Zehnder interferometer suitable for use in femtosecond pump–probe or dichroism spectroscopy with self-mode-locked titanium–sapphire oscillators. A galvanometer-type rapid-scanning translation stage is employed in the pump arm of the interferometer. The intensity or polarization of the pump beam is modulated by a fused-silica photoelastic modulator employed as a half-wave retarder. The detection system exploits the rapid-scanning stage and photoelastic modulator by combining phase-sensitive detection with transient digitization. The system we describe permits pump–probe or dichroism spectroscopy to be conducted without temporal distortion of the laser pulses used in the experiment, with high scan-to-scan reproducibility, and with all of the previously noted advantages of rapid-scanning methods in terms of sensitivity. The approach is especially well suited for use with pulse-picked or cavity-dumped sources, which are often required to be operated at moderate pulse-repetition rates in order to avoid artifacts from sample heating or from long-lived intermediates. © 1997 American Institute of Physics.

© 1997 American Institute of Physics

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KEYWORDS and PACS

Keywords

Mach-Zehnder interferometers, high-speed optical techniques, light polarisation, dichroism, nonlinear optics, measurement by laser beam, modulation spectroscopy, solid lasers, acousto-optical modulation

PACS

  • 07.60.Ly

    Interferometers

  • 06.60.Jn

    High-speed techniques (microsecond to femtosecond)

  • 42.62.Fi

    Laser spectroscopy

  • 42.62.Eh

    Metrological applications; optical frequency synthesizers for precision spectroscopy

  • 42.79.Jq

    Acousto-optical devices

  • 42.79.Hp

    Optical processors, correlators, and modulators

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1148287

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    D. C. Edelstein , R. B. Romney , and M. Scheuermann , Rev. Sci. Instrum. 62 , 579 ( 1991RSINAK000062000003000579000001 ).

    J. A. Moon , Rev. Sci. Instrum. 64 , 1775 ( 1993RSINAK000064000007001775000001 ).

    D. S. Alavi , R. S. Hartman , and D. H. Waldeck , J. Chem. Phys. 92 , 4055 ( 1990JCPSA6000092000007004055000001 ).


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