Abstract

We show that thermal aberration in optically pumped solid-state lasers can lead to the breakup of the beam profile. Kerr lensing present in the self-mode-locked regime tends to reduce the beam size in the laser material; such a beam is less sensitive to the thermal aberration, and its shape becomes free of secondary lobes. The thermal aberration has also the effect of moving the optimal operation point for self-mode locking. Experimental results obtained with a Ti:sapphire laser support our theoretical results.

© 1994 Optical Society of America

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References

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1993 (4)

1992 (7)

1991 (3)

’tHooft, G. W.

Abramowitz, M.

M. Abramowitz, I. A. Stegun, Handbook of Mathematical Functions (Dover, New York, 1965), Chap. 7, p. 299.

Albers, P.

J. Frauchinger, P. Albers, H. P. Weber, IEEE J. Quantum Electron. 28, 1046 (1992).
[CrossRef]

Asaki, M. T.

Barty, C. P. J.

Brabec, T.

Cormier, J. F.

J. F. Cormier, M. Piché, F. Salin, Proc. Soc. Photo-Opt. Instrum. Eng. 2041, 17 (1993).

Cunningham, J. E.

Curley, P. F.

Flood, C. J.

Frauchinger, J.

J. Frauchinger, P. Albers, H. P. Weber, IEEE J. Quantum Electron. 28, 1046 (1992).
[CrossRef]

Fujimoto, J. G.

H. A. Haus, J. G. Fujimoto, E. P. Ippen, IEEE J. Quantum Electron. 28, 2086 (1992).
[CrossRef]

Garvey, D.

Georgiev, D.

D. Georgiev, J. Herrmann, U. Stamm, Opt. Commun. 92, 368 (1992).
[CrossRef]

Haus, H. A.

H. A. Haus, J. G. Fujimoto, E. P. Ippen, IEEE J. Quantum Electron. 28, 2086 (1992).
[CrossRef]

Herrmann, J.

D. Georgiev, J. Herrmann, U. Stamm, Opt. Commun. 92, 368 (1992).
[CrossRef]

Huang, C. P.

Ippen, E. P.

H. A. Haus, J. G. Fujimoto, E. P. Ippen, IEEE J. Quantum Electron. 28, 2086 (1992).
[CrossRef]

Kapteyn, H. C.

Kean, P. N.

Keller, U.

Knox, W. H.

Krausz, F.

Lemoff, B. E.

Liu, K. X.

Murnane, M. M.

Pelouch, W. S.

Piché, M.

M. Piché, F. Salin, Opt. Lett. 18, 1041 (1993).
[CrossRef] [PubMed]

J. F. Cormier, M. Piché, F. Salin, Proc. Soc. Photo-Opt. Instrum. Eng. 2041, 17 (1993).

M. Piché, Opt. Commun. 86, 156 (1991).
[CrossRef]

Powers, P. E.

Salin, F.

M. Piché, F. Salin, Opt. Lett. 18, 1041 (1993).
[CrossRef] [PubMed]

J. F. Cormier, M. Piché, F. Salin, Proc. Soc. Photo-Opt. Instrum. Eng. 2041, 17 (1993).

Schimdt, A. J.

Sibbett, W.

Spence, D. E.

Spielmann, Ch.

Stamm, U.

D. Georgiev, J. Herrmann, U. Stamm, Opt. Commun. 92, 368 (1992).
[CrossRef]

Stegun, I. A.

M. Abramowitz, I. A. Stegun, Handbook of Mathematical Functions (Dover, New York, 1965), Chap. 7, p. 299.

Tang, C. L.

van Driel, H. M.

Walker, D.

Weber, H. P.

J. Frauchinger, P. Albers, H. P. Weber, IEEE J. Quantum Electron. 28, 1046 (1992).
[CrossRef]

Wintner, E.

Zhou, J.

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Figures (4)

Fig. 1
Fig. 1

Thermal phase retardation in a Ti:sapphire laser material pumped by a Gaussian beam of waist wp = 40 μm, for three different pump powers.

Fig. 2
Fig. 2

Differential gain as a function of the lens separation L12.

Fig. 3
Fig. 3

Calculated beam profile when the laser is operated near the stability limit, with L12 = 15.79 cm and a pump power of 4.5 W: (a) at the output mirror, (b) in the active medium. CW, continuous wave; ML, self-mode locked.

Fig. 4
Fig. 4

Experimental beam profile measured at the output of a Ti:sapphire laser, with a 4.5-W absorbed pump (a) cw regime, (b) mode-locked regime.

Equations (2)

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d 2 T ( x ) d x 2 + Q ( x ) k = 0 ,
Δ ϕ T ( ξ ) = π P λ k d n d T [ i 1 erfc ( ξ ) - 1 π + ξ ] ,

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