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Sub-watt threshold, kilohertz-linewidth Raman distributed-feedback fiber laser.

Jindan Shi1, Shaif-ul Alam, Morten Ibsen

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We developed a novel Raman distributed-feedback fiber laser with a narrow linewidth and low threshold. This fiber laser operates at 1109.54 nm, offering single-frequency performance for advanced applications.

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Area of Science:

  • Photonics and Laser Technology
  • Optical Engineering
  • Materials Science

Background:

  • Fiber lasers are crucial for various applications, but achieving narrow linewidths and low thresholds remains a challenge.
  • Raman distributed-feedback (R-DFB) lasers offer a promising approach to overcome these limitations.

Purpose of the Study:

  • To demonstrate a low-threshold, narrow linewidth Raman distributed-feedback (R-DFB) fiber laser.
  • To characterize the performance of a novel R-DFB fiber laser operating at 1109.54 nm.

Main Methods:

  • Fabrication of a 30 cm long center π phase-shifted Bragg grating in germano-silica (Ge/Si) fiber.
  • Pumping the R-DFB laser using a continuous-wave (CW) 1064 nm fiber laser source.
  • Characterization of threshold power, linewidth (FWHM), and slope efficiency using standard optical and radiofrequency (rf) measurement techniques.

Main Results:

  • Achieved a low threshold power of 440 mW.
  • Measured a narrow full width at half-maximum (FWHM) linewidth of <2.5 kHz using a 29.75 km fiber delay line.
  • Obtained a slope efficiency of 13.5% with respect to incident pump power.
  • Confirmed single-frequency operation using an rf spectrum analyzer.

Conclusions:

  • The developed R-DFB fiber laser demonstrates excellent performance with low threshold and narrow linewidth.
  • The use of a phase-shifted Bragg grating in Ge/Si fiber is effective for achieving high-performance fiber lasers.
  • This laser technology holds potential for applications requiring stable, single-frequency light sources.