Abstract

We demonstrate a double-clad fiber laser that incorporates a pump-light absorbing coaxially located Tm3+-doped outer core that reaches threshold and resonantly pumps an Ho3+-doped inner core. Under cw diode pumping, the output from the laser displays a pulse modulated behavior at wavelengths corresponding to the Tm3+ transition and short gain switched pulses from the Ho3+ core that have mode-locked characteristics. The Ho3+ and Tm3+ fiber lasers simultaneously produced 1.5 W across 2040–2140 nm and operate at a pulse repetition frequency of 80  kHz and at pulse widths as short as 330 ns.

© 2009 Optical Society of America

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References

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  1. E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.
  2. J. Nilsson, R. Paschotta, J. E. Caplen, and D. C. Hanna, Opt. Lett. 22, 1092 (1997).
    [CrossRef] [PubMed]
  3. D. Hanna, “Optical fibre with doped core and doped inner cladding, for use in an optical fibre laser,” U.S. patent 5,291,501 (March 1, 1994).
  4. S. D. Jackson, IEEE Photon. Technol. Lett. 18, 1885 (2006).
    [CrossRef]

2006 (1)

S. D. Jackson, IEEE Photon. Technol. Lett. 18, 1885 (2006).
[CrossRef]

1997 (1)

Caplen, J. E.

Hakimi, F.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Hanna, D.

D. Hanna, “Optical fibre with doped core and doped inner cladding, for use in an optical fibre laser,” U.S. patent 5,291,501 (March 1, 1994).

Hanna, D. C.

Jackson, S. D.

S. D. Jackson, IEEE Photon. Technol. Lett. 18, 1885 (2006).
[CrossRef]

McCollum, B. C.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Nilsson, J.

Paschotta, R.

Po, H.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Snitzer, E.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

Tumminelli, R.

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

IEEE Photon. Technol. Lett. (1)

S. D. Jackson, IEEE Photon. Technol. Lett. 18, 1885 (2006).
[CrossRef]

Opt. Lett. (1)

Other (2)

E. Snitzer, H. Po, F. Hakimi, R. Tumminelli, and B. C. McCollum, in Optical Fiber Sensors, Vol. 2 of OSA Technical Digest Series (Optical Society of America, 1988), paper PD5.

D. Hanna, “Optical fibre with doped core and doped inner cladding, for use in an optical fibre laser,” U.S. patent 5,291,501 (March 1, 1994).

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Figures (3)

Fig. 1
Fig. 1

Measured refractive index profile of the fiber preform. The inset shows an optical microscope image of the holmium ( Ho 3 + ) inner-core/germanosilicate doped barrier region and thulium ( Tm 3 + ) outer-core double-clad optical fiber.

Fig. 2
Fig. 2

(a) Measured laser spectrum using the broadband (BB) OC for L = 100   cm , showing the emission from the Tm 3 + and Ho 3 + transitions. The transmission characteristics of the BB OC mirror are shown. The inset shows an image of the fiber end face, showing laser emission from both cores, with the hexagonal cladding highlighted. (b) Measured laser spectrum using the long-pass OC mirror and L = 100   cm fiber, showing dominant emission from the Ho 3 + transition. The transmission characteristics of the long-pass OC are shown. The inset shows an image of the fiber end face, when the laser emission was predominantly from the inner core.

Fig. 3
Fig. 3

(a) Measured temporal output of the Ho 3 + transition using the long-pass OC; the inset shows the mode-locked characteristics of the pulse. (b) Measured temporal characteristics of the output of the Tm 3 + transition recorded simultaneously with the Ho 3 + output.

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