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Broadband time-domain absorption spectroscopy with a ns-pulse supercontinuum source.

Yaroslav Sych1, Rainer Engelbrecht, Bernhard Schmauss

  • 1Erlangen Graduate School in Advanced Optical Technologies, University of Erlangen-Nuremberg, Paul-Gordan-Str 6, 91052 Erlangen, Germany. yaroslav.sych@psi.ch

Optics Express
|December 18, 2010
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Summary

A new Q-switched laser system enables broadband absorption spectroscopy (1390-1740 nm) using photonic crystal and dispersive fibers. This system achieves 2 cm(-1) resolution for real-time gas mixture analysis.

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Area of Science:

  • Spectroscopy
  • Laser Technology
  • Fiber Optics

Background:

  • Broadband absorption spectroscopy requires efficient light sources and detection methods.
  • Existing techniques may lack the speed or resolution for real-time gas analysis.
  • Q-switched lasers offer pulsed, high-intensity light suitable for spectroscopic applications.

Purpose of the Study:

  • To develop and test a Q-switched laser-based system for broadband absorption spectroscopy.
  • To achieve high spectral resolution and fast acquisition times for gas mixture analysis.
  • To evaluate the system's performance in determining molar concentrations and associated uncertainties.

Main Methods:

  • Utilizing a Q-switched Nd:YAG laser (1064 nm) coupled with a photonic crystal fiber for broadband generation.
  • Employing a 25 km dispersive single-mode fiber to spectrally spread the light pulses over time.
  • Implementing temporally-resolved detection and an algorithm for analyzing gas absorption spectra.

Main Results:

  • Developed a system for broadband absorption spectroscopy in the 1390-1740 nm range with 2 cm(-1) resolution.
  • Demonstrated real-time acquisition of gas mixture spectra (CO2:CH4:N2) with millisecond time scales.
  • Achieved species concentrations with a 5% relative error for sufficient signal-to-noise ratios.

Conclusions:

  • The developed Q-switched laser system is effective for fast, high-resolution broadband absorption spectroscopy.
  • The system enables real-time monitoring and analysis of gas mixtures.
  • Further evaluation of potentials and limitations is discussed for future applications.