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.

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Highly efficient Raman fiber laser

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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


Highly efficient raman fiber laser

OUTLINE

I: Raman scattering and gain

II: Raman fiber lasers (two generations)

III: Standard Model

IV: Experimental set-up

V: Results & discussion

VI: Conclusion


Highly efficient raman fiber laser

I: Raman fiber laser (RFL)


Highly efficient raman fiber laser

Raman scattering

Spontaneous

Stimulated


Highly efficient raman fiber laser

Raman gain spectrum

@ = 1μm

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


Highly efficient raman fiber laser

Stokes

Pump

Evolution of the Stokes and pump signals

: Forward SRS


Highly efficient raman fiber laser

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


Highly efficient raman fiber laser

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


Highly efficient raman fiber laser

Raman fiber lasers: 2nd generation

Nested cavities


Highly efficient raman fiber laser

Spectral coverage

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


Highly efficient raman fiber laser

0

L

Z

Standard numerical model

R2

R1

PpIN

PsOUT

Bragg gratings

1108nm

Pp

PpIN

1165nm

Psf

PsOUT

Psb


Highly efficient raman fiber laser

Standard numerical model

  • Propagation equations:

  • Boundary conditions:


Highly efficient raman fiber laser

Laser optimisation vs ROC

RIC= 99%


Highly efficient raman fiber laser

Laser optimisation vs L

RIC = 99%

ROC= 26%


Highly efficient raman fiber laser

II: Highly efficient FRL


Highly efficient raman fiber laser

Experimental set-up

(15 W)

Corning

HI980 (9% Ge)


Highly efficient raman fiber laser

Pump

Stokes


Highly efficient raman fiber laser

Spectral broadening


Highly efficient raman fiber laser

First configuration: OC1


Highly efficient raman fiber laser

Laser curve with OC1


Highly efficient raman fiber laser

Stokes vs absorbed pump with OC1


Highly efficient raman fiber laser

Second configuration: OC2

OC2

IC


Highly efficient raman fiber laser

Laser curve with OC2


Highly efficient raman fiber laser

Stokes vs absorbed pump with OC2


Highly efficient raman fiber laser

Effective reflectivity


Highly efficient raman fiber laser

Effective reflectivity (OC2)


Highly efficient raman fiber laser

Cladding-mode losses (IC)


Highly efficient raman fiber laser

Cladding-mode losses (IC)


Highly efficient raman fiber laser

Effective losses (IC/OC2)


Highly efficient raman fiber laser

Laser curve with OC2


Highly efficient raman fiber laser

Tuning of FBGs : Set-up


Highly efficient raman fiber laser

Tuning curve


Highly efficient raman fiber laser

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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