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Related Experiment Videos

Solid hydrogen Raman shifter for the mid-infrared range (4.4-8 microm).

Kirill E Kuyanov1, Takamasa Momose, Andrey F Vilesov

  • 1Department of Physical Chemistry, University of Southern California, Los Angeles, California 90089, USA.

Applied Optics
|December 14, 2004
PubMed
Summary

We created a tunable mid-infrared laser using stimulated Raman scattering in para-hydrogen. This new laser source offers a spectral linewidth of 0.4 cm(-1) for molecular spectroscopy.

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Area of Science:

  • Laser Physics
  • Spectroscopy
  • Condensed Matter Physics

Background:

  • Mid-infrared (MIR) spectral range is crucial for molecular spectroscopy.
  • Developing tunable MIR laser sources is challenging.
  • Para-hydrogen offers unique properties for nonlinear optical processes.

Purpose of the Study:

  • To develop a pulsed, continuously tunable laboratory laser source for the MIR spectral range (4.4-8 microm).
  • To characterize the laser source's spectral linewidth and output energies.
  • To demonstrate the application of the laser source for molecular spectroscopy.

Main Methods:

  • Stimulated backward Raman scattering in solid para-hydrogen at 4 K.
  • Pumping with a commercial near-infrared optical parametric oscillator (OPO).

Related Experiment Videos

  • Recording spectra of NO, H2O, and CH4 molecules.

    • Main Results:

    • Achieved a tunable MIR laser source with a spectral linewidth of 0.4 cm(-1).
    • Output energies ranged from 1.7 mJ at 4.4 microm to 120 microJ at 8 microm.
    • Successfully recorded spectra of NO, H2O, and CH4 molecules.

    Conclusions:

    • The developed laser source provides a versatile tool for MIR molecular spectroscopy.
    • The use of para-hydrogen in stimulated Raman scattering is effective for generating tunable MIR radiation.
    • Further studies on the Raman cell operation with different pumping wavelengths are warranted.