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Simultaneous Second-Harmonic, Sum-Frequency Generation and Stimulated Raman Scattering in MgO:PPLN.

Dismas K Choge1,2, Huaixi Chen3, Lei Guo4

  • 1Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China. cdismas2004@yahoo.com.

Materials (Basel, Switzerland)
|November 16, 2018
PubMed
Summary

Researchers demonstrated multi-wavelength generation using MgO-doped periodically poled lithium niobate (MgO:PPLN). This method simultaneously achieved second-harmonic generation (SHG), sum frequency generation (SFG), and Raman conversion for diverse applications.

Keywords:
Ramanfrequency conversionlithium niobatephase-matchingvisible light

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Area of Science:

  • Nonlinear Optics
  • Materials Science

Background:

  • Periodically poled lithium niobate (PPLN) is crucial for nonlinear optical frequency conversion.
  • MgO-doping enhances the photorefractive resistance of PPLN, enabling higher power applications.
  • Multi-wavelength generation is essential for various spectroscopic and photonic applications.

Purpose of the Study:

  • To demonstrate simultaneous second-harmonic generation (SHG), sum frequency generation (SFG), and Raman conversion using a single MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal.
  • To achieve efficient multi-wavelength generation for potential applications in biomedicine and basic research.

Main Methods:

  • Utilized a single MgO:PPLN crystal with a uniform poling period of 10.2 µm.
  • Employed a simplified double-pass geometry for frequency conversion.
  • Used a 974 nm laser diode as the primary pump source and a C-band tunable laser source for SFG.

Main Results:

  • Achieved 0.8 W of blue light at 487 nm via frequency doubling of the 974 nm pump.
  • Generated 0.5 W of orange light at 598 nm through frequency mixing.
  • Observed unexpected wavelengths including a 1038 nm line attributed to Stimulated Raman Scattering (SRS) at high pump powers.

Conclusions:

  • Demonstrated a versatile MgO:PPLN-based platform for simultaneous SHG, SFG, and Raman conversion.
  • The generated multi-wavelength light source shows promise for applications requiring diverse optical outputs.
  • The study highlights the potential of MgO:PPLN in advanced photonic applications.