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Super-flat supercontinuum generation from a Tm-doped fiber amplifier.

Mengmeng Tao1, Ting Yu2, Zhenbao Wang1

  • 1State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi'an 710024, P. R. China.

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|March 30, 2016
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Summary

Super-flat supercontinua were generated using a thulium-doped fiber amplifier. Different configurations achieved broad spectral coverage and excellent flatness for advanced optical applications.

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Area of Science:

  • Fiber optics
  • Nonlinear optics
  • Laser physics

Background:

  • Supercontinuum generation is crucial for various spectroscopic and sensing applications.
  • Thulium-doped fiber amplifiers offer potential for generating mid-infrared supercontinua.
  • Achieving both broad bandwidth and flatness in supercontinuum spectra remains a challenge.

Purpose of the Study:

  • To investigate supercontinuum generation from a double-clad thulium-doped fiber amplifier.
  • To compare the performance of direct-output and passive pigtail laser configurations.
  • To optimize supercontinuum properties for specific applications.

Main Methods:

  • Utilizing a double-clad thulium-doped fiber amplifier.
  • Investigating two distinct laser configurations: direct-output and passive pigtail.
  • Characterizing the generated supercontinuum spectra, including bandwidth and flatness.

Main Results:

  • The direct-output configuration extended the long-wavelength edge beyond 2.65 μm with a 740 nm bandwidth.
  • The passive pigtail configuration yielded a supercontinuum with <1 dB intensity difference flatness from 1.98 μm to 2.41 μm.
  • Both configurations demonstrated effective supercontinuum generation with distinct spectral characteristics.

Conclusions:

  • Double-clad thulium-doped fiber amplifiers are capable of producing super-flat supercontinua.
  • The choice of laser configuration significantly impacts the supercontinuum's spectral characteristics.
  • Optimized supercontinua can be achieved for applications requiring broad bandwidth or high flatness.