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Rapid shifted excitation Raman difference spectroscopy with a distributed feedback diode laser emitting at 785 nm

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Abstract

A distributed feedback (DFB) laser diode emitting at 785 nm was tested and applied as a light source for shifted excitation Raman difference spectroscopy (SERDS). Due to the physical properties of the laser diode, it was possible to shift the emission wavelength by 8 cm-1 (0.5 nm) required for our SERDS measurements by simply changing the injection current. The internal grating ensured single mode operation at both wavelength with the frequency stability of ±0.06 cm-1 (0.004 nm) required for high resolution Raman spectroscopic applications. The shifted spectra were used for calculating enhanced Raman spectra being obscured by a strong scattering background. A 16 dB (≈38 fold) improvement of the signal-to-background noise S̄/σB was demonstrated using blackboard chalk as a sample. The tunable DFB laser is a versatile excitation source for SERDS, which could be used in any dispersive Raman system to subtract fluorescence contributions and scattering background.

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Authors and Affiliations

  1. Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Strasse 4, 12489, Berlin, Germany

    M. Maiwald, G. Erbert, A. Klehr, B. Sumpf & G. Tränkle

  2. Optisches Institut, Technische Universität Berlin, Hardenbergstr. 36, 10623, Berlin, Germany

    H.-D. Kronfeldt & H. Schmidt

Authors
  1. M. Maiwald
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  2. G. Erbert
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  3. A. Klehr
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  4. H.-D. Kronfeldt
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  5. H. Schmidt
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  6. B. Sumpf
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  7. G. Tränkle
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Corresponding author

Correspondence to M. Maiwald.

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PACS

82.80.Gk; 42.55.-f; 42.64.Fi

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Maiwald, M., Erbert, G., Klehr, A. et al. Rapid shifted excitation Raman difference spectroscopy with a distributed feedback diode laser emitting at 785 nm. Appl. Phys. B 85, 509–512 (2006). https://doi.org/10.1007/s00340-006-2459-8

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  • DOI: https://doi.org/10.1007/s00340-006-2459-8

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