Abstract

We report a passively Q-switched all-fiber laser using a large mode area (LMA) Yb3+-doped fiber cladding-pumped at 915 nm and an unpumped single-mode Yb3+-doped fiber as the saturable absorber (SA). The saturable absorber fiber and gain fiber were coupled with a free-space telescope to optimize the coupling efficiency between the disparate fibers, preferentially bleaching the SA fiber before gain depletion in the pumped fiber. Using this scheme we first demonstrate a Q-switched oscillator with 40 μJ 79 ns pulses at 1026 nm, and show that pulses can be generated from 1020 nm to 1040 nm. The associated peak power of the oscillator alone is more than two orders of magnitude larger than that reported in previous experimental studies using an Yb3+-doped fiber as a saturable absorber. We further demonstrate an amplified pulse energy of 0.4 mJ using an Yb3+-doped cladding pumped fiber amplifier. Experimental studies in which the saturable absorber length, pump times, and wavelengths are independently varied reveal the impact of these parameters on laser performance.

© 2012 OSA

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References

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  1. M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
    [CrossRef]
  2. A. A. Fotiadi, A. S. Kurkov, and I. M. Razdobreev, “All fiber passively Q-switched Ytterbium laser,” in Proceedings of Conference on Laser and Electro-Optics Europe (IEEE, 2005), p. 515.
  3. T.-Y. Tsai, Y.-C. Fang, Z.-C. Lee, and H.-X. Tsao, “All-fiber passively Q-switched erbium laser using mismatch of mode field areas and a saturable-amplifier pump switch,” Opt. Lett.34(19), 2891–2893 (2009).
    [CrossRef] [PubMed]
  4. T.-Y. Tsai, Y.-C. Fang, H.-M. Huang, H.-X. Tsao, and S.-T. Lin, “Saturable absorber Q- and gain-switched all Yb3+ all-fiber laser at 976 nm and 1064 nm,” Opt. Express18(23), 23523–23528 (2010).
    [CrossRef] [PubMed]
  5. D. B. Soh, S. E. Bisson, B. D. Patterson, and S. W. Moore, “High-power all-fiber passively Q-switched laser using a doped fiber as a saturable absorber: numerical simulations,” Opt. Lett.36(13), 2536–2538 (2011).
    [CrossRef] [PubMed]
  6. J. F. Michel, Digonnet, Rare-Earth-Doped Fiber Lasers and Amplifiers (Marcel Dekker, Inc., 2001)
  7. V. V. Dvoyrin, V. M. Mashinsky, and E. M. Dianov, “Yb-Bi pulsed fiber lasers,” Opt. Lett.32(5), 451–453 (2007).
    [CrossRef] [PubMed]

2011 (1)

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2009 (1)

2007 (1)

2006 (1)

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Aitameur, K.

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Bisson, S. E.

Dianov, E. M.

Dvoyrin, V. V.

Fang, Y.-C.

Gilles, J.

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Girard, S.

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Huang, H.-M.

Laroche, M.

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Lee, Z.-C.

Lin, S.-T.

Mashinsky, V. M.

Moore, S. W.

Passilly, N.

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Patterson, B. D.

Soh, D. B.

Tsai, T.-Y.

Tsao, H.-X.

IEEE Photon. Technol. Lett. (1)

M. Laroche, J. Gilles, S. Girard, N. Passilly, and K. Aitameur, “Nanosecond pulse generation in a passively Q-switched Yb-doped fiber laser by Cr4+:YAG saturable absorber,” IEEE Photon. Technol. Lett.18(6), 764–766 (2006).
[CrossRef]

Opt. Express (1)

Opt. Lett. (3)

Other (2)

J. F. Michel, Digonnet, Rare-Earth-Doped Fiber Lasers and Amplifiers (Marcel Dekker, Inc., 2001)

A. A. Fotiadi, A. S. Kurkov, and I. M. Razdobreev, “All fiber passively Q-switched Ytterbium laser,” in Proceedings of Conference on Laser and Electro-Optics Europe (IEEE, 2005), p. 515.

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Figures (9)

Fig. 1
Fig. 1

Experimental set-up of tapered Q-switched fiber oscillator.

Fig. 2
Fig. 2

(a) Pulse energy, FWHM pulse width vs. YB1200 6/125 fiber SA length. 30 cm YB1200 20/125 gain fiber, 50 Hz rep. rate. (b) Pulse temporal profile for different SA lengths. 22 cm Yb1200 20/125 gain fiber, 50 Hz rep. rate.

Fig. 3
Fig. 3

(a). FWHM pulse width, pulse energy vs. wavelength. (b) FWHM pulse width, absorbed 915nm pump power vs. wavelength. 30 cm YB1200 20/125 DC fiber, 22 cm YB1200 6/125 saturable absorber fiber. Q-switch rep. rate = 50 Hz.

Fig. 4
Fig. 4

Spectral profile of 1025.5nm, 140 ns pulse. 30 cm YB1200 20/125 DC fiber, 22 cm YB1200 6/125 saturable absorber fiber. Q-switch rep. rate = 50 Hz.

Fig. 5
Fig. 5

Pulse energy, FWHM pulse width vs. 915 nm pump time. 30cm YB1200 20/125 DC fiber. 14 cm YB1200 6/125 saturable absorber fiber. Rep. rate = 50Hz. Pump power decreases from 22.4 W to 5.6 W as pump time increases from 60 μs to 300 μs.

Fig. 6
Fig. 6

Comparison of simulation and experiment (a) Energy vs. SA fiber length. (b) Pulse width vs. SA length.

Fig. 7
Fig. 7

Simulated parameter study for output energy vs. coupling efficiency between gain and SA fiber.

Fig. 8
Fig. 8

Experimental set-up of Q-switched fiber MOPA, using a fiber SA.

Fig. 9
Fig. 9

Amplified pulse energy vs. launched 975 nm power. 1.00 m YB1200 20/125 DC fiber amplifier. Input pulse energy and duration = 15 µJ and 125 ns, respectively. Rep. rate = 50 Hz.

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