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First-order distributed feedback dye laser effect in reflection pumping geometry.

Fei Chen1, Denis Gindre, Jean-Michel Nunzi

  • 1Laboratoire POMA, UMR 6136- Universite d' Angers, Angers, France.

Optics Letters
|March 7, 2007
PubMed
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This study demonstrates tunable distributed feedback lasing using reflection gratings in Rhodamine 6G (R6G) and DCM-doped solutions. The novel approach achieved full spectral tuning independent of refractive index, showcasing pure gain and index coupling.

Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Traditional distributed feedback (DFB) lasers often use transmission gratings.
  • Developing tunable laser sources is crucial for various spectroscopic applications.

Purpose of the Study:

  • To investigate tunable DFB lasing using reflection gratings.
  • To explore lasing characteristics in Rhodamine 6G (R6G)-doped ethanol and 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM)-doped methanol.

Main Methods:

  • Fabrication of DFB laser structures utilizing reflection gratings.
  • Doping ethanol with R6G and methanol with DCM as gain media.
  • Characterization of lasing output and tuning properties under optical pumping.

Main Results:

Related Experiment Videos

  • Achieved tunable DFB lasing output from R6G and DCM-doped solutions.
  • Observed pure gain coupling in R6G-doped ethanol and index coupling in DCM-doped methanol.
  • Demonstrated tuning across the entire stimulated emission band, independent of the lasing medium's refractive index.
  • Observed dual-peak lasing emission in DCM-doped methanol, with peak separation increasing with pump energy.

Conclusions:

  • Reflection grating configuration enables effective tunable DFB lasing.
  • The method allows for pure gain or index coupling, offering versatile laser design.
  • Tuning range is independent of the gain medium's refractive index, simplifying laser design.