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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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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


I: Raman fiber laser (RFL)


Raman scattering

Spontaneous

Stimulated


Raman gain spectrum

@ = 1μm

D.J. Dougherty, et al. Opt. Lett. 20, (1995) 31-33.


Stokes

Pump

Evolution of the Stokes and pump signals

: Forward SRS


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


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


Raman fiber lasers: 2nd generation

Nested cavities


Spectral coverage

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


0

L

Z

Standard numerical model

R2

R1

PpIN

PsOUT

Bragg gratings

1108nm

Pp

PpIN

1165nm

Psf

PsOUT

Psb


Standard numerical model

  • Propagation equations:

  • Boundary conditions:


Laser optimisation vs ROC

RIC= 99%


Laser optimisation vs L

RIC = 99%

ROC= 26%


II: Highly efficient FRL


Experimental set-up

(15 W)

Corning

HI980 (9% Ge)


Pump

Stokes


Spectral broadening


First configuration: OC1


Laser curve with OC1


Stokes vs absorbed pump with OC1


Second configuration: OC2

OC2

IC


Laser curve with OC2


Stokes vs absorbed pump with OC2


Effective reflectivity


Effective reflectivity (OC2)


Cladding-mode losses (IC)


Cladding-mode losses (IC)


Effective losses (IC/OC2)


Laser curve with OC2


Tuning of FBGs : Set-up


Tuning curve


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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