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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 7 — Jul. 1, 2014
  • pp: 1465–1475

Temporal and spectral correlations in bulk continua and improved use in transient spectroscopy

M. Bradler and E. Riedle  »View Author Affiliations


JOSA B, Vol. 31, Issue 7, pp. 1465-1475 (2014)
http://dx.doi.org/10.1364/JOSAB.31.001465


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Abstract

Newly generated frequencies during bulk continuum generation with femtosecond pump pulses do not fluctuate statistically and show strong correlations in spectrum and time. When a femtosecond continuum is used as probe light for transient spectroscopic measurements, these correlations result in a seemingly low noise level but large-scale pseudo-structures that obscure the interpretation. We investigate the correlations for continua generated in YAG and calcium fluoride plates and incorporate the results into the design of our pump–probe setup. The high degree of correlation to the next pulse is utilized through chopping of the pump and referencing between successive laser shots. To suppress the adverse effect of the high degree of correlation to other wavelengths, we extend the detection by multichannel referencing with a second camera. The combination of both referencing schemes renders a precise spectral calibration unnecessary and increases the sensitivity of our spectrometer by a factor of 5 down to 20 μOD. This is already very close to the shot noise limit. To demonstrate the improvements, we present and discuss measurements on two different molecular solutions.

© 2014 Optical Society of America

OCIS Codes
(030.6600) Coherence and statistical optics : Statistical optics
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(190.4360) Nonlinear optics : Nonlinear optics, devices
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7150) Ultrafast optics : Ultrafast spectroscopy

ToC Category:
Spectroscopy

History
Original Manuscript: March 21, 2014
Revised Manuscript: May 9, 2014
Manuscript Accepted: May 11, 2014
Published: June 5, 2014

Citation
M. Bradler and E. Riedle, "Temporal and spectral correlations in bulk continua and improved use in transient spectroscopy," J. Opt. Soc. Am. B 31, 1465-1475 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-7-1465

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