Abstract

We report a novel quasi-synchronously pumped PPMgLN-based high power mid-infrared (MIR) laser with picosecond pulse bunch output. The pump laser is a linearly polarized MOPA structured all fiberized Yb fiber laser with picosecond pulse bunch output. The output from a mode-locked seed fiber laser was directed to pass through a FBG reflector via a circulator to narrow the pulse duration from 800 ps to less than 50 ps and the spectral FWHM from 9 nm to 0.15 nm. The narrowed pulses were further directed to pass through a novel pulse multiplier through which each pulse was made to become a pulse bunch composing of 13 sub-pulses with pulse to pulse time interval of 1.26 ns. The pulses were then amplified via two stage Yb fiber amplifiers to obtain a linearly polarized high average power output up to 85 W, which were then directed to pass through an isolator and to pump a PPMgLN-based optical parametric oscillator via quasi-synchronization pump scheme for ps pulse bunch MIR output. High MIR output with average power up to 4 W was obtained at 3.45 micron showing the feasibility of such pump scheme for ps pulse bunch MIR output.

© 2013 Optical Society of America

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  1. U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
  4. P. Loza-Alvarez, C. T. A. Brown, D. T. Reid, W. Sibbett, and M. Missey, “High-repetition-rate ultrashort-pulse optical parametric oscillator continuously tunable from 2.8 to 6.8 mum,” Opt. Lett.24(21), 1523–1525 (1999).
    [CrossRef] [PubMed]
  5. N. Coluccelli, H. Fonnum, M. Haakestad, A. Gambetta, D. Gatti, M. Marangoni, P. Laporta, and G. Galzerano, “250-MHz synchronously pumped optical parametric oscillator at 2.25-2.6 μm and 4.1-4.9 μm,” Opt. Express20(20), 22042–22047 (2012).
    [CrossRef] [PubMed]
  6. K. Ozgören, B. Öktem, S. Yılmaz, F. Ö. Ilday, and K. Eken, “83 W, 3.1 MHz, square-shaped, 1 ns-pulsed all-fiber-integrated laser for micromachining,” Opt. Express19(18), 17647–17652 (2011).
    [CrossRef] [PubMed]
  7. S. P. Chen, H. W. Chen, J. Hou, and Z. J. Liu, “100 W all fiber picosecond MOPA laser,” Opt. Express17(26), 24008–24012 (2009).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  9. P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
    [CrossRef]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
  19. H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
    [CrossRef]

2012

2011

2010

2009

T. P. Lamour, L. Kornaszewski, J. H. Sun, and D. T. Reid, “Yb:fiber-laser-pumped high-energy picosecond optical parametric oscillator,” Opt. Express17(16), 14229–14234 (2009).
[CrossRef] [PubMed]

S. P. Chen, H. W. Chen, J. Hou, and Z. J. Liu, “100 W all fiber picosecond MOPA laser,” Opt. Express17(26), 24008–24012 (2009).
[CrossRef] [PubMed]

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

2006

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

2005

B. Molocher, “Countermeasure laser development,” Proc. SPIE5989, 598902, 598902-10 (2005).
[CrossRef]

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

2004

2002

2000

1999

Alam, S.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Alam, S.-U.

Arisholm, G.

Auerbach, M.

Boller, K.-J.

Brown, C. T. A.

Cai, S.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Cai, S. S.

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

Chen, H. W.

Chen, K.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Chen, K. K.

Chen, S. P.

Chen, T.

Cho, A.

Coluccelli, N.

Ebrahim-Zadeh, M.

Eken, K.

Esteban-Martin, A.

Fallnich, C.

Fonnum, H.

Furusawa, K.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Galzerano, G.

Gambetta, A.

Gatti, D.

Geiser, P.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Gmachl, C.

Gross, P.

Guo, B.

Haakestad, M.

Haakestad, M. W.

Hayes, J. R.

Hou, J.

Ilday, F. Ö.

Jiang, P.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Jiang, P. P.

T. Chen, K. H. Wei, P. P. Jiang, B. Wu, and Y. H. Shen, “High-power multichannel PPMgLN-based optical parametric oscillator pumped by a master oscillation power amplification-structured Q-switched fiber laser,” Appl. Opt.51(28), 6881–6885 (2012).
[CrossRef] [PubMed]

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

Keller, U.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Khorsandi, A.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Klein, M. E.

Kokabee, O.

Kornaszewski, L.

Lamour, T. P.

Laporta, P.

Le, H. Q.

Lecomte, S.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Lin, D.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Lin, D. J.

Lippert, E.

Liu, Z. J.

Loza-Alvarez, P.

Luo, G. P.

Malinowski, A.

K. K. Chen, J. H. V. Price, S.-U. Alam, J. R. Hayes, D. J. Lin, A. Malinowski, and D. J. Richardson, “Polarisation maintaining 100W Yb-fiber MOPA producing µJ pulses tunable in duration from 1 to 21 ps,” Opt. Express18(14), 14385–14394 (2010).
[CrossRef] [PubMed]

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Marangoni, M.

Missey, M.

Molocher, B.

B. Molocher, “Countermeasure laser development,” Proc. SPIE5989, 598902, 598902-10 (2005).
[CrossRef]

Öktem, B.

Ozgören, K.

Paschotta, R.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Pawlik, S.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Peabody, M.

Peng, C.

Price, J. H. V.

Reid, D. T.

Richardson, D. J.

D. J. Lin, S.-U. Alam, Y. H. Shen, T. Chen, B. Wu, and D. J. Richardson, “Large aperture PPMgLN based high-power optical parametric oscillator at 3.8 µm pumped by a nanosecond linearly polarized fiber MOPA,” Opt. Express20(14), 15008–15014 (2012).
[CrossRef] [PubMed]

K. K. Chen, J. H. V. Price, S.-U. Alam, J. R. Hayes, D. J. Lin, A. Malinowski, and D. J. Richardson, “Polarisation maintaining 100W Yb-fiber MOPA producing µJ pulses tunable in duration from 1 to 21 ps,” Opt. Express18(14), 14385–14394 (2010).
[CrossRef] [PubMed]

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Robertson, A.

Saraji, M.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Schade, W.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Schmidt, B.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

Shen, Y.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Shen, Y. H.

D. J. Lin, S.-U. Alam, Y. H. Shen, T. Chen, B. Wu, and D. J. Richardson, “Large aperture PPMgLN based high-power optical parametric oscillator at 3.8 µm pumped by a nanosecond linearly polarized fiber MOPA,” Opt. Express20(14), 15008–15014 (2012).
[CrossRef] [PubMed]

T. Chen, K. H. Wei, P. P. Jiang, B. Wu, and Y. H. Shen, “High-power multichannel PPMgLN-based optical parametric oscillator pumped by a master oscillation power amplification-structured Q-switched fiber laser,” Appl. Opt.51(28), 6881–6885 (2012).
[CrossRef] [PubMed]

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

Sibbett, W.

Sivco, D.

Stenersen, K.

Sun, J. H.

Tremont, M. A.

Walde, T.

Wallenstein, R.

Wang, Y.

Wang, Y. X.

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

Wei, K. H.

Wessels, P.

Willer, U.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Wu, B.

D. J. Lin, S.-U. Alam, Y. H. Shen, T. Chen, B. Wu, and D. J. Richardson, “Large aperture PPMgLN based high-power optical parametric oscillator at 3.8 µm pumped by a nanosecond linearly polarized fiber MOPA,” Opt. Express20(14), 15008–15014 (2012).
[CrossRef] [PubMed]

T. Chen, K. H. Wei, P. P. Jiang, B. Wu, and Y. H. Shen, “High-power multichannel PPMgLN-based optical parametric oscillator pumped by a master oscillation power amplification-structured Q-switched fiber laser,” Appl. Opt.51(28), 6881–6885 (2012).
[CrossRef] [PubMed]

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

Xu, H. B.

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

Yang, D. Z.

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

Yilmaz, S.

Zhang, H. L.

Appl. Opt.

IEEE J. Sel. Top. Quantum Electron.

Y. Shen, S. Alam, K. Chen, D. Lin, S. Cai, B. Wu, P. Jiang, A. Malinowski, and D. J. Richardson, “PPMgLN -based high power optical parametric oscillator pumped by Yb3+-doped fiber amplifier incorporates active pulse shaping,” IEEE J. Sel. Top. Quantum Electron.15(2), 385–392 (2009).
[CrossRef]

IEEE Photon. Technol. Lett.

S. Lecomte, R. Paschotta, S. Pawlik, B. Schmidt, K. Furusawa, A. Malinowski, D. J. Richardson, and U. Keller, “Synchronously Pumped Optical Parametric Oscillator With a Repetition Rate of 81.8 GHz,” IEEE Photon. Technol. Lett.17(2), 483–485 (2005).
[CrossRef]

J. Nonlinear Opt. Phys.

H. B. Xu, B. Wu, S. S. Cai, and Y. H. Shen, “Investigation on the pump acceptance bandwidth for collinear quasi – phase -matching optical parametric amplification,” J. Nonlinear Opt. Phys.18(1), 141–151 (2009).
[CrossRef]

Laser Phys. Lett.

P. P. Jiang, D. Z. Yang, Y. X. Wang, T. Chen, B. Wu, and Y. H. Shen, “All-fiberized MOPA structured single-mode pulse Yb fiber laser with a linearly polarized output power of 30 W,” Laser Phys. Lett.6(5), 384–387 (2009).
[CrossRef]

Opt. Express

D. J. Lin, S.-U. Alam, Y. H. Shen, T. Chen, B. Wu, and D. J. Richardson, “Large aperture PPMgLN based high-power optical parametric oscillator at 3.8 µm pumped by a nanosecond linearly polarized fiber MOPA,” Opt. Express20(14), 15008–15014 (2012).
[CrossRef] [PubMed]

T. P. Lamour, L. Kornaszewski, J. H. Sun, and D. T. Reid, “Yb:fiber-laser-pumped high-energy picosecond optical parametric oscillator,” Opt. Express17(16), 14229–14234 (2009).
[CrossRef] [PubMed]

B. Guo, Y. Wang, C. Peng, H. L. Zhang, G. P. Luo, H. Q. Le, C. Gmachl, D. Sivco, M. Peabody, and A. Cho, “Laser-based mid-infrared reflectance imaging of biological tissues,” Opt. Express12(1), 208–219 (2004).
[CrossRef] [PubMed]

N. Coluccelli, H. Fonnum, M. Haakestad, A. Gambetta, D. Gatti, M. Marangoni, P. Laporta, and G. Galzerano, “250-MHz synchronously pumped optical parametric oscillator at 2.25-2.6 μm and 4.1-4.9 μm,” Opt. Express20(20), 22042–22047 (2012).
[CrossRef] [PubMed]

K. Ozgören, B. Öktem, S. Yılmaz, F. Ö. Ilday, and K. Eken, “83 W, 3.1 MHz, square-shaped, 1 ns-pulsed all-fiber-integrated laser for micromachining,” Opt. Express19(18), 17647–17652 (2011).
[CrossRef] [PubMed]

S. P. Chen, H. W. Chen, J. Hou, and Z. J. Liu, “100 W all fiber picosecond MOPA laser,” Opt. Express17(26), 24008–24012 (2009).
[CrossRef] [PubMed]

K. K. Chen, J. H. V. Price, S.-U. Alam, J. R. Hayes, D. J. Lin, A. Malinowski, and D. J. Richardson, “Polarisation maintaining 100W Yb-fiber MOPA producing µJ pulses tunable in duration from 1 to 21 ps,” Opt. Express18(14), 14385–14394 (2010).
[CrossRef] [PubMed]

M. W. Haakestad, H. Fonnum, G. Arisholm, E. Lippert, and K. Stenersen, “Mid-infrared optical parametric oscillator synchronously pumped by an erbium-doped fiber laser,” Opt. Express18(24), 25379–25388 (2010).
[CrossRef] [PubMed]

Opt. Lasers Eng.

U. Willer, M. Saraji, A. Khorsandi, P. Geiser, and W. Schade, “Near- and mid-infrared laser monitoring of industrial processes, environment and security applications,” Opt. Lasers Eng.44(7), 699–710 (2006).
[CrossRef]

Opt. Lett.

Proc. SPIE

B. Molocher, “Countermeasure laser development,” Proc. SPIE5989, 598902, 598902-10 (2005).
[CrossRef]

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Figures (10)

Fig. 1
Fig. 1

Experimental setup of the fiber laser system with picosecond pulse bunch output. HWP, half-wave plate; PBS, polarization beam splitter; FR, Faraday rotator; QR, quartz rotator.

Fig. 2
Fig. 2

(a) Spectra and (b) pulses of the seed output under different pump powers.

Fig. 3
Fig. 3

Spectra (a) and the pulses (b) from the seed fiber laser and after the spectrum purifier.

Fig. 4
Fig. 4

Sub-pulse structures of a typical pulse bunch output from the pulse multiplier.

Fig. 5
Fig. 5

Output power from the main fiber amplifier with respect to the launched LD pump power. The insets show the spectra and the pulse bunch structure.

Fig. 6
Fig. 6

Experimental setup of the quasi-synchronously pumped OPO.

Fig. 7
Fig. 7

The idler output power dependence on the pump power under two different lens positions as well as the pump to idler conversion efficiency under the optimized condition.

Fig. 8
Fig. 8

Pump power dependent OPO signal spectra shift and broadening.

Fig. 9
Fig. 9

Pulse structures of a typical pump and signal pulse bunch.

Fig. 10
Fig. 10

Signal photon lifetime as a function of the OPO output mirror reflectivity under various round-trip loss.

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