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Applied Physics B

, Volume 85, Issue 4, pp 509–512 | Cite as

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

  • M. MaiwaldEmail author
  • G. Erbert
  • A. Klehr
  • H.-D. Kronfeldt
  • H. Schmidt
  • B. Sumpf
  • G. Tränkle
Rapid communication

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.

Keywords

Wavelength Shift Raman Line Single Mode Operation Raman Spec Optical Output Power 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • M. Maiwald
    • 1
    Email author
  • G. Erbert
    • 1
  • A. Klehr
    • 1
  • H.-D. Kronfeldt
    • 2
  • H. Schmidt
    • 2
  • B. Sumpf
    • 1
  • G. Tränkle
    • 1
  1. 1.Ferdinand-Braun-Institut für HöchstfrequenztechnikBerlinGermany
  2. 2.Optisches InstitutTechnische Universität BerlinBerlinGermany

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