Abstract

Experimental demonstration is presented of lasing in a gain-guided index antiguided Nd3+-doped phosphate glass core fiber. This type of lasing remains in its lowest-order mode even when pumped well above threshold, leading to excellent beam quality.

© 2007 Optical Society of America

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References

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  1. A. E. Siegman, "Propagating modes in gain-guided optical fibers," J. Opt. Soc. Am. A 20, 1617-1628 (2003).
    [CrossRef]
  2. A. E. Siegman, "Gain guided, index-antiguided fiber lasers," J. Opt. Soc. Am. B 24, 1677-1682 (2007).
    [CrossRef]
  3. Kigre, Inc., Hilton Head, South Carolina http://www.kigre.com
  4. T. F. Johnston, Jr, "Beam propagation (M2) measurement made as easy as it gets: the four-cuts method," Appl. Opt. 37, 4840-4850 (1998).
    [CrossRef]
  5. ISO 11146: Lasers and laser-related equipment: test methods for laser beam parameters-beam widths, divergence angle and beam propagation factor (1999).
  6. T. Li, "Diffraction loss and selection of modes in maser resonators with circular mirrors," Bell Syst. Tech. J. 44, 917-932 (1965).
  7. W. Koechner, Solid State Laser Engineering, 5th Ed. (Springer-Verlag, 1999).
  8. L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
    [CrossRef]
  9. P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
    [CrossRef]

2007 (1)

2004 (1)

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

2003 (1)

1998 (1)

1997 (1)

L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
[CrossRef]

1965 (1)

T. Li, "Diffraction loss and selection of modes in maser resonators with circular mirrors," Bell Syst. Tech. J. 44, 917-932 (1965).

Cole, B.

L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
[CrossRef]

Goldberg, L.

L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
[CrossRef]

Johnston, T. F.

Koechner, W.

W. Koechner, Solid State Laser Engineering, 5th Ed. (Springer-Verlag, 1999).

Li, T.

T. Li, "Diffraction loss and selection of modes in maser resonators with circular mirrors," Bell Syst. Tech. J. 44, 917-932 (1965).

Mansuripur, M.

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

Peyghambarian, N.

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

Polynkin, P.

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

Siegman, A. E.

Snitzer, E.

L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
[CrossRef]

Temyanko, V.

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

Appl. Opt. (1)

Bell Syst. Tech. J. (1)

T. Li, "Diffraction loss and selection of modes in maser resonators with circular mirrors," Bell Syst. Tech. J. 44, 917-932 (1965).

Electron. Lett. (1)

L. Goldberg, B. Cole, and E. Snitzer, "V-groove side-pumped 1.5 μm fiber amplifier," Electron. Lett. 33, 2127-2129 (1997).
[CrossRef]

IEEE Photonics Technol. Lett. (1)

P. Polynkin, V. Temyanko, M. Mansuripur, and N. Peyghambarian, "Efficient and scalable side pumping scheme for short high-power optical fiber lasers and amplifiers," IEEE Photonics Technol. Lett. 16, 2024-2026 (2004).
[CrossRef]

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (1)

Other (3)

Kigre, Inc., Hilton Head, South Carolina http://www.kigre.com

ISO 11146: Lasers and laser-related equipment: test methods for laser beam parameters-beam widths, divergence angle and beam propagation factor (1999).

W. Koechner, Solid State Laser Engineering, 5th Ed. (Springer-Verlag, 1999).

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Figures (8)

Fig. 1
Fig. 1

(a) Sketch of the flashlamp pumped GG-IAG fiber laser experiment. (b) Schematic of the M 2 measurement setup. The filters were a combination of near-infrared transmitting and neutral-density filters. The lens was an aberration-free, bi-convex, f 30 lens with focal length of 28 cm . The turning mirrors were aligned at 45 deg to the laser beam axis to ensure a true 180 deg turn. A Spiricon CCD camera on a translation stage was used to measure the beam diameter over twice the Rayleigh range of the beam.

Fig. 2
Fig. 2

Output energy versus input energy demonstrating the threshold and slope efficiency of the flashlamp-pumped GG-IAG fiber laser.

Fig. 3
Fig. 3

(a) Relaxation oscillation spikes from the flashlamp-pumped fiber laser just above threshold ( 14 J ) . (b) Relaxation oscillation spikes from the flashlamp-pumped fiber laser at 3 times threshold ( 43 J ) .

Fig. 4
Fig. 4

Spectrum of the fiber laser just above threshold. Just below threshold the spectral width is about 10 nm FWHM.

Fig. 5
Fig. 5

Mode beating in one relaxation oscillation spike when the laser is pumped near threshold.

Fig. 6
Fig. 6

Spiricon beam-profiler image of the output beam 152 mm from the output end of the fiber.

Fig. 7
Fig. 7

Gaussian fit (smooth curve) of the horizontal profile data from Fig. 6 using ORIGIN to evaluate the data.

Fig. 8
Fig. 8

Measured beam diameter in both horizontal (∎) and vertical (▴) directions as a function of distance along the beam propagation axis [see the experimental schematic in Fig. 1b] when the input energy was 30 J . The error bars indicated are ± 5 % . The minimum beam diameters (beam waists) were calculated from this data to be 0.44 ± 0.02 and 0.41 ± 0.02 mm for the horizontal and vertical directions, respectively. The solid curve is a fit to Eq. (1) of the data for the horizontal diameter as a function of distance along the beam propagation direction, and the dashed curve is the fit for the vertical diameter.

Tables (1)

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Table 1 Calculated Values of M 2 for Several Pump Input Energies a

Equations (7)

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W ( z ) = W 0 , h or v [ ( 1 + ( z z 0 ) 2 Z R ) ] 1 2 ,
Z R = π W 0 2 M h or v 2 λ ,
Δ N ( 2 π a λ ) 2 ( 2 n 0 ) Δ n ,
Δ G ( 2 π a λ ) 2 ( n 0 λ 2 π ) g ,
G th 10 = 4 j 01 4 Δ N 133.8 Δ N ,
g osc , th = 1 2 l g ln ( R 1 R 2 )
g osc , th + g th , 01 GG = 0.19 + 0.14 = 0.33 cm 1

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