Abstract

We have demonstrated 7.6 W of continuous-wave radiation at λ = 1.06 μm in a TEM00 mode from a diode end-pumped Nd:YAG laser pumped by 38 laser diodes that are coupled to a bundle of 19 fibers. TEM00-mode operation was enforced by using an intracavity aperture. The absorbed power in the Nd:YAG rod was 16.4 W when the incident power upon the laser rod was 21.1 W. The optical-to-optical conversion efficiency was 46%. In multimode operation, 11 W of output power and a slope efficiency of 69% were obtained. The thermal analysis was in good agreement with interferometric measurements.

© 1992 Optical Society of America

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References

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1991 (2)

1990 (1)

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

1988 (1)

1985 (1)

1979 (1)

K. Kubodera, K. Otsuka, J. Appl. Phys. 50, 653 (1979).
[CrossRef]

Bear, T. M.

M. S. Keirstead, T. M. Bear, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CFC3.

Berger, J.

Byer, R. L.

Dixon, G. J.

Hamilton, C. E.

Hoffman, N. J.

Kane, T. J.

Kaneda, Y.

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

Y. Kaneda, M. Oka, H. Masuda, S. Kubota, in Extended Abstracts of the 51st Autumn Meeting (Japan Society of Applied Physics, Tokyo, 1990), paper 28aS4 (in Japanese).

M. Oka, H. Masuda, Y. Kaneda, S. Kubota, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1990), paper CWC5.

Keirstead, M. S.

M. S. Keirstead, T. M. Bear, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CFC3.

Kubodera, K.

K. Kubodera, K. Otsuka, J. Appl. Phys. 50, 653 (1979).
[CrossRef]

Kubota, S.

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

M. Oka, H. Masuda, Y. Kaneda, S. Kubota, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1990), paper CWC5.

Y. Kaneda, M. Oka, H. Masuda, S. Kubota, in Extended Abstracts of the 51st Autumn Meeting (Japan Society of Applied Physics, Tokyo, 1990), paper 28aS4 (in Japanese).

Lowenthal, D. D.

Masuda, H.

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

M. Oka, H. Masuda, Y. Kaneda, S. Kubota, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1990), paper CWC5.

Y. Kaneda, M. Oka, H. Masuda, S. Kubota, in Extended Abstracts of the 51st Autumn Meeting (Japan Society of Applied Physics, Tokyo, 1990), paper 28aS4 (in Japanese).

Muller, C. H.

Oka, M.

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

M. Oka, H. Masuda, Y. Kaneda, S. Kubota, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1990), paper CWC5.

Y. Kaneda, M. Oka, H. Masuda, S. Kubota, in Extended Abstracts of the 51st Autumn Meeting (Japan Society of Applied Physics, Tokyo, 1990), paper 28aS4 (in Japanese).

Otsuka, K.

K. Kubodera, K. Otsuka, J. Appl. Phys. 50, 653 (1979).
[CrossRef]

Radecki, D.

Scifres, D. R.

Seamans, J. F.

Shannon, D. C.

Smith, J. J.

Streifer, W.

Tidwell, S. C.

Wallace, R. W.

Welch, D. F.

Zhou, B.

J. Appl. Phys. (1)

K. Kubodera, K. Otsuka, J. Appl. Phys. 50, 653 (1979).
[CrossRef]

Opt. Lett. (4)

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

S. Kubota, M. Oka, Y. Kaneda, H. Masuda, Proc. Soc. Photo-Opt. Instrum. Eng. 1354, 572 (1990).

Other (3)

Y. Kaneda, M. Oka, H. Masuda, S. Kubota, in Extended Abstracts of the 51st Autumn Meeting (Japan Society of Applied Physics, Tokyo, 1990), paper 28aS4 (in Japanese).

M. Oka, H. Masuda, Y. Kaneda, S. Kubota, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1990), paper CWC5.

M. S. Keirstead, T. M. Bear, in Digest of Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1991), paper CFC3.

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Figures (4)

Fig. 1
Fig. 1

Schematic of the experimental setup of the diode-pumped Nd:YAG laser. The Nd:YAG laser is pumped with 38 diodes, each of which emits 0.9 W of power. The pumping light is coupled to a bundle of 19 fibers, and 21.1 W of pumping light is emitted from a 700-μm-diameter circular area. HR, highly reflecting; AR, antireflecting.

Fig. 2
Fig. 2

Output characteristic in three cases: circles, multimode operation; rectangles, TEM00 mode without a Brewster window; triangles, TEM00 mode with a Brewster window. The nonlinearity in TEM00-mode operation can be explained by the change in the radius of the cavity eigenmode that is due to the thermal lensing effect.

Fig. 3
Fig. 3

Schematic of the interferometric measurement. The Nd:YAG laser is not oscillating in this experiment. The lensing effect can be canceled by translating the expanding lens of the telescope, while the aberrations cannot be canceled.

Fig. 4
Fig. 4

(a) Observed and (b) simulated interferogram. The defocus (lensing effect) is already canceled so that these interferograms show the thermal aberration.

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