Abstract

The beam quality of large-mode-area fiber amplifiers was investigated at the 10 W power level using a tunable ring cavity, that is also used in the laboratory system of GEO600 as a pre-mode-cleaner for mode filtering. More than 98% of the overall output power were contained within the polarized (200:1) TEM00 mode with an appropriate choice of coiling diameter. With the high sensitivity ring cavity analysis, the beam quality improvement caused by decreasing the coiling diameter was verified, while this could not be seen within conventional M2-measurements. The results are compared with the properties of single-mode fibers.

© 2003 Optical Society of America

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References

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CLEO 2003

D. Hammons, J. Anderegg, S. Brosnan, H. Komini and M. Wickham, ??High power fiber amplifiers for kilowatt fiber arrays,?? in Conference on Lasers and Electro-Optics 2003, Technical Digest (Optical Society of America, Washington, D.C., 2003), Postdeadline paper CThPDB10.

IEEE J. Sel. Top. Quantum Electron.

H.M. Pask, R.J. Carman, D.C. Hanna, A.C. Tropper, C.J. Mackechnie, P.R. Barber and J.M. Dawes, ??Ytterbium-Doped Silica Fiber Lasers: Versatile Sources for the 1-1.2 µm Region,?? IEEE J. Sel. Top. Quantum Electron. 1, 2-13 (1995).
[CrossRef]

Opt. Commun.

P. We?els, M. Auerbach and C. Fallnich, ??Narrow-linewidth master oscillator fiber power amplifier system with very low amplified spontaneous emission,?? Opt. Commun. 205, 215-219 (2002).
[CrossRef]

Opt. Lett.

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Figures (4)

Fig. 1.
Fig. 1.

Setup of the fiber amplifier and the ring cavity. NPRO: nonplanar ring oscillator, DM: dichroic mirror, PBS: polarizing beam splitter, PR: partially reflecting mirror, MMO: mode-matching optics, RC: ring cavity, PD1/2: photodetectors, CCD: CCD-camera.

Fig. 2.
Fig. 2.

Polarized emission spectra of the Ytterbium-doped fiber amplifiers recorded with an effective resolution bandwidth of 0.55 nm. Blue: 4 µm-amplifier, red: 10 µm-amplifier, black: 29 µm large-mode-area amplifier with 21 cm coiling diameter. The spectra are normalized to the relative output power of the respective amplifiers.

Fig. 3.
Fig. 3.

Polarization ratio of the large-mode-area fiber amplifier for (a) 62 cm coiling diameter and (b) 21 cm coiling diameter. Dashed lines: 3rd order polynomial fits to guide the reader’s eye.

Fig. 4.
Fig. 4.

Reflected (a) and transmitted (b) power at the ring cavity for the large-mode-area fiber amplifier (coiling diameter: 21 cm). In the insets the respective full-scale scanning-signals are shown.

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