Abstract

A diode-pumped Tm-doped fiber-optic amplifier that has a small-signal gain of >30 dB at 1870 nm is reported. Output pulses of up to 3-W peak power at a 1–60-kHz repetition rate can be generated by amplification of 20–40-ns laser diode pulses of up to 2-mW launched peak power. The output signal quality, i.e., the ratio of the output pulse energy and the total amplified spontaneous emission (ASE) output energy between two pulses, depends on the relative propagation direction of pump and signal and can be dramatically increased by choice of the correct propagation scheme. In the optimum pump geometry the pulse energy can be raised to as much as 20 times the ASE energy. This is the first report to the author’s knowledge of fiber-optic amplification of short diode laser pulses near 1.9 µm with high repetition rates in Tm-doped fibers.

© 2005 Optical Society of America

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References

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2004

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

B. M. Walsh and N. P. Barnes, Appl. Phys. B 78, 325 (2004).
[CrossRef]

2003

2002

1998

1994

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Barnes, N. P.

Clarkson, W. A.

Digonnet, M. J. F.

M. J. F. Digonnet, Rare-Earth-Doped Fiber Lasers and Amplifiers (Marcel Dekker, New York, 2001).
[CrossRef]

El-Sherif, A. F.

Hanna, D. C.

Jackson, S. D.

Kiefer, R.

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

King, T. A.

Komukai, T.

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Miyajima, Y.

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Nilsson, J.

Rattunde, M.

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

Schmitz, J.

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

Sugawa, T.

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Turner, P. W.

Wagner, J.

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

Walsh, B. M.

B. M. Walsh and N. P. Barnes, Appl. Phys. B 78, 325 (2004).
[CrossRef]

B. M. Walsh, NASA Langley Research Center, Hampton, Va. 23681 (personal communication, 2004).

Yamamoto, T.

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Appl. Phys. B

B. M. Walsh and N. P. Barnes, Appl. Phys. B 78, 325 (2004).
[CrossRef]

Appl. Phys. Lett.

M. Rattunde, J. Schmitz, R. Kiefer, and J. Wagner, Appl. Phys. Lett. 84, 4750 (2004), and references therein.
[CrossRef]

Opt. Fiber Technol.

Y. Miyajima, T. Komukai, T. Sugawa, and T. Yamamoto, Opt. Fiber Technol. 1, 35 (1994).
[CrossRef]

Opt. Lett.

Other

M. J. F. Digonnet, Rare-Earth-Doped Fiber Lasers and Amplifiers (Marcel Dekker, New York, 2001).
[CrossRef]

B. M. Walsh, NASA Langley Research Center, Hampton, Va. 23681 (personal communication, 2004).

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Figures (4)

Fig. 1
Fig. 1

Experimental schematic of the amplifier.

Fig. 2
Fig. 2

Peak output power, ASE output power (top inset), and SNR (bottom inset) versus pump power for copropagating (filled circles) and counterpropagating (open circles) pump and signal beams at 2-mW input peak power, a 30-ns pulse width, and a 60-kHz repetition rate.

Fig. 3
Fig. 3

SNR/νRep of 30-ns pulses at repetition rates νRep of 1–60 kHz and 2-mW input peak power versus pump power.

Fig. 4
Fig. 4

SNR and gain of the fiber amplifier of 30-ns, 60-kHz pulses at optimum pump power versus signal peak power.

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