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Single mode fiber laser emitting 94W at 977 nm

Single mode fiber laser emitting 94W at 977 nm. J. Boullet 1 , Y. Zaouter 1,2 , R. Desmarchelier, M. Cazeaux, F. Salin 3 and E. Cormier 1 1 CELIA, Université Bordeaux 1, France 2 Amplitude Systèmes, Pessac, France 3 Eolite Systems, 11 Avenue Canteranne 33 600 Pessac, France. Outline.

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Single mode fiber laser emitting 94W at 977 nm

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  1. Single mode fiber laser emitting 94W at 977 nm J. Boullet1 , Y. Zaouter1,2, R. Desmarchelier, M. Cazeaux, F. Salin3 and E. Cormier1 1CELIA, Université Bordeaux 1, France 2 Amplitude Systèmes, Pessac, France 3Eolite Systems, 11 Avenue Canteranne 33 600 Pessac, France Advanced Solid-State Photonics, Tuesday, February 3, 2009

  2. Outline • Introduction • Experimental setup • Results and simulations • Conclusions and outlook Advanced Solid-State Photonics, Tuesday, February 3, 2009

  3. Introduction NL crystal 976 nm 488 nm • Needs for high brightness sources emitting at 976 nm ?TELECOM (EDFA) Core pumping of Yb or Er doped fibers Tight pumping of Yb based bulk materials Laser surgery • Needs for high brightness sources emitting at 488 nm ? Replacement of Ar ion lasers Biophotonics DNA sequencing Flux Citometry Advanced Solid-State Photonics, Tuesday, February 3, 2009

  4. Introduction State of the art of actual technologies for single mode high power laser sources emitting at 976 nm? • Laser Diode (~1W) • VCSEL (Demonstration of 30W, typically 10W) • Yb DOPED LASER MATERIAL… Advanced Solid-State Photonics, Tuesday, February 3, 2009

  5. Introduction State of the art of actual technologies for single mode high power laser sources emitting at 976 nm? • Laser Diode (~1W) • VCSEL (Demonstration of 30W, typically 10W) • Yb DOPED LASER MATERIAL… State of the art up to 2008… Up to 1.4 W at 985 nm… Up to 3.5 W at 976 nm… * [K.H. Ylä-Jarkko et al., "A 3,5 W 977 nm cladding-pumped jacketed-air clad ytterbium-doped fiber laser", in Proc. Advanced Solid State Photonics, San Antonio, TX, Feb 3-5, 2003, Postdeadline Paper PD 2] Advanced Solid-State Photonics, Tuesday, February 3, 2009

  6. Laser operation Configuration 1 Yb-doped fiber 2F5/2 ls=1030 nm lp= 976 nm 2F7/2 Advanced Solid-State Photonics, Tuesday, February 3, 2009

  7. Laser operation Configuration 1 Configuration 2 Yb-doped fiber Yb-doped fiber 2F5/2 2F5/2 915 nm ls=1030 nm 1030 nm 976 nm lp= 976 nm 2F7/2 2F7/2 Advanced Solid-State Photonics, Tuesday, February 3, 2009

  8. Main issues ssabs 1 Transparency: Bleaching is achieved if : for a pump intensity of: ssem ssem ~ssabs ssabs ssem Transparency at 1030 nm achieved for inversion ~5% … Advanced Solid-State Photonics, Tuesday, February 3, 2009

  9. Main issues 2 Gain competition between quasi and true 3-level laser operation : Clad to core area ratio Pump absorption • Typical DC LMA fiber: 30 / 250 µm • β=70 :αp=1 dB => G1030 nm> 50 dB • Even for 20 % of absorbed pump power, ASE at 1030 nm will dominate laser operation at 977 nm!!! Advanced Solid-State Photonics, Tuesday, February 3, 2009

  10. Main issues 2 Gain competition between quasi and true 3-level laser operation : Clad to core area ratio Pump absorption • Jacketed air clad DC fiber : 9 / 20 µm • β=8 :αp=9 dB => G1030 nm< 50 dB • Φclad=20 µm=> Pp ~ few W * [K.H. Ylä-Jarkko et al., "A 3,5 W 977 nm cladding-pumped jacketed-air clad ytterbium-doped fiber laser", in Proc. Advanced Solid State Photonics, San Antonio, TX, Feb 3-5, 2003, Postdeadline Paper PD 2] Advanced Solid-State Photonics, Tuesday, February 3, 2009

  11. Main issues 2 Gain competition between quasi and true 3-level laser operation : Clad to core area ratio Pump absorption • Rod type U-LMA PCF : 80 / 200 µm • β=6.2 :αp=9 dB => G1030 nm< 50 dB • Φclad=200 µm => Pp ~ several 100W Advanced Solid-State Photonics, Tuesday, February 3, 2009

  12. Experimental setup Rod type fiber : Microstructured Double clad Yb doped 80µm/200µm Absorption: 10 dB/m Length : 1.2 m 1 Pptrans = 11 W 2 b = 6.2, losses = 60 dB Boullet et al., OE 16, 17891 (2008) Advanced Solid-State Photonics, Tuesday, February 3, 2009

  13. Results Spectrum : Efficiency : 977.5 nm ASE 94 W Parasitic lasing suppression : Beam quality : M2 = 1.35 35 dB Advanced Solid-State Photonics, Tuesday, February 3, 2009

  14. Simulations Pump reinjection: Population inversion: 60 W Losses at 1030 nm: Our experiment: Cavity losses : 14 dB Medium gain : G976 = 7 dB per passAbsorption : a = 11 dB Geometry : b = 6.2 50 dB Boullet et al., OE 16, 17891 (2008) Advanced Solid-State Photonics, Tuesday, February 3, 2009

  15. Conclusions • Demonstration of an ultra-high power Yb fiber laser source • Single mode TEM00 : M2 = 1.35 • Zero line transition at 977 nm • Output power : 94 W (pump power limited) • Large core Yb-doped microstructured rod type fiber • Very compact and simple setup • Analysis through numerical simulations • Pump absorption and population inversion • Pump recycling • Influence of the core diameter Boullet et al., OE 16, 17891 (2008) Advanced Solid-State Photonics, Tuesday, February 3, 2009

  16. Outlooks • Applications • Core pumping of Yb or Er doped fibers • High fluence pumping of Yb doped bulk material • High power high quality pumping of Yb doped bulk material • Frequency conversion -> high power high brightness sources at 488 nm • Further studies • Q-switch • Single frequency • Frequency doubling Advanced Solid-State Photonics, Tuesday, February 3, 2009

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