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Highly efficient Raman fiber laser

Highly efficient Raman fiber laser. Collaborators: E. Bélanger M. Bernier B. Déry D. Faucher. Réal Vallée. OUTLINE. I: Raman scattering and gain II: Raman fiber lasers (two generations) III: Standard Model IV: Experimental set-up V: Results & discussion VI: Conclusion.

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Highly efficient Raman fiber laser

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  1. Highly efficient Raman fiber laser Collaborators: E. Bélanger M. Bernier B. Déry D. Faucher Réal Vallée

  2. OUTLINE I: Raman scattering and gain II: Raman fiber lasers (two generations) III: Standard Model IV: Experimental set-up V: Results & discussion VI: Conclusion

  3. I: Raman fiber laser (RFL)

  4. Raman scattering Spontaneous Stimulated

  5. Raman gain spectrum @ = 1μm D.J. Dougherty, et al. Opt. Lett. 20, (1995) 31-33.

  6. Stokes Pump Evolution of the Stokes and pump signals : Forward SRS

  7. 1. Angular tuning: CW Raman fiber lasers: 1st generation R. Stolen et al. Appl. Phys. Lett. 30, (1977) 340 2. Time-dispersion tuning: C. Lin et al. Appl. Phys. Lett. 31 (1977) 97-99

  8. Raman fiber lasers: 2nd generation • Key elements were developed for the 2nd generation of RFL • Fiber Bragg gratings • providing reduced losses, spectral selectivity & tunability • Low loss fibers • standard or with high Ge or P content • High power Ytterbium fiber lasers • providing power, reliability and spectral bandwidth

  9. Raman fiber lasers: 2nd generation Nested cavities

  10. Spectral coverage E.M. Dianov et al., Quantum Electron. 35, 435-441 (2005)

  11. 0 L Z Standard numerical model R2 R1 PpIN PsOUT Bragg gratings 1108nm Pp PpIN 1165nm Psf PsOUT Psb

  12. Standard numerical model • Propagation equations: • Boundary conditions:

  13. Laser optimisation vs ROC RIC= 99%

  14. Laser optimisation vs L RIC = 99% ROC= 26%

  15. II: Highly efficient FRL

  16. Experimental set-up (15 W) Corning HI980 (9% Ge)

  17. Pump Stokes

  18. Spectral broadening

  19. First configuration: OC1

  20. Laser curve with OC1

  21. Stokes vs absorbed pump with OC1

  22. Second configuration: OC2 OC2 IC

  23. Laser curve with OC2

  24. Stokes vs absorbed pump with OC2

  25. Effective reflectivity

  26. Effective reflectivity (OC2)

  27. Cladding-mode losses (IC)

  28. Cladding-mode losses (IC)

  29. Effective losses (IC/OC2)

  30. Laser curve with OC2

  31. Tuning of FBGs : Set-up

  32. Tuning curve

  33. Conclusion • RFL with efficiencies approaching quantum limit can be obtained using well designed FBGs. • The standard model (AuYeung & Yariv) can be used provided effective R and  are considered. • 10 W output is achievable from an optical fiber with a moderate Ge content. • Tunability over tens of nm is expected.

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