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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Co-MOFs as Emerging Pulse Modulators for Femtosecond Ultrafast Fiber Laser.

Mingqi An1,2, Zhiwen Pan1,2, Xiaohui Li1

  • 1School of Physics and Information Technology, Shaanxi Normal University, Xi'an710062China.

ACS Applied Materials & Interfaces
|December 7, 2022
PubMed
Summary

This study introduces novel rGO-Co3O4 and rGO-ZIF-67 materials for ultrafast photonics. These metal-organic framework-based modulators enable advanced fiber laser applications and optical communications.

Keywords:
Er3+-doped fiber laserconventional solitondodecahedron-Co-MOFspulse modulatorssoliton moleculeultrafast photonics

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs), particularly zeolitic imidazolate frameworks (ZIFs), offer unique structural properties for advanced materials.
  • ZIF-67 serves as a precursor for porous nanostructured cobalt-based metal oxides.
  • Reduced graphene oxide (rGO) can form 3D carbon structures, useful for material assembly.

Purpose of the Study:

  • To synthesize and characterize rGO-ZIF-67 and its derived rGO-Co3O4 material.
  • To fabricate microfiber-based modulators using these materials.
  • To investigate their nonlinear optical absorption and application in fiber lasers.

Main Methods:

  • Liquid-phase synthesis of rGO-ZIF-67 followed by calcination at 350 °C to yield rGO-Co3O4.
  • Fabrication of microfiber-based modulators.
  • Testing nonlinear optical absorption at 1.5 μm and characterizing fiber laser performance.

Main Results:

  • rGO-Co3O4 and rGO-ZIF-67 modulators exhibited modulation depths of 10.41% and 6.61%, respectively.
  • rGO-Co3O4 modulator generated conventional solitons (793.4 fs pulse width) and soliton molecules in Er3+-doped fiber lasers.
  • rGO-ZIF-67 modulator produced conventional solitons with a spectral width of 1.9 nm.

Conclusions:

  • The developed rGO-Co3O4 and rGO-ZIF-67 materials show promise for ultrafast photonics.
  • These MOF-based materials open new avenues for fiber lasers, optical communications, and optoelectronics.
  • This research expands the application scope of MOF-based materials in photonics.