Abstract

An ultralow-threshold Kerr-lens mode-locked Ti:Al2O3 laser achieved by use of an extended cavity design is demonstrated. Mode-locking thresholds as low as 156 mW are achieved. Pulses with durations as short as 14 fs and bandwidths of >100 nm with output powers of 15 mW at 50-MHz repetition rates are generated by only 200 mW of pump power. Reducing the pump power requirements to a factor of 10× less than required by most conventional Kerr-lens mode-locked lasers permits inexpensive, low-power pump lasers to be used. This will facilitate the development of low-cost, high-performance femtosecond Ti:Al2O3 laser technology.

© 2002 Optical Society of America

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References

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1999

1996

1994

1993

1991

Angelow, G.

Asaki, M. T.

Blonigen, F.

Bouma, B. E.

Chen, Y.

Cho, S. H.

Christov, I. P.

Fujimoto, J. G.

U. Morgner, F. X. Kaertner, S. H. Cho, Y. Chen, H. A. Haus, J. G. Fujimoto, E. P. Ippen, V. Scheuer, G. Angelow, and T. Tschudi, Opt. Lett. 24, 417 (1999).
[CrossRef]

S. H. Cho, B. E. Bouma, E. P. Ippen, and J. G. Fujimoto, Opt. Lett. 24, 417 (1999).
[CrossRef]

T. R. Schibli, L. M. Matos, F. J. Grawert, J. G. Fujimoto, and F. X. Kärtner, in Ultrafast Phenomena, Vol. 72 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), paper TuC5.

Gallmann, L.

Garvey, D.

Grawert, F. J.

T. R. Schibli, L. M. Matos, F. J. Grawert, J. G. Fujimoto, and F. X. Kärtner, in Ultrafast Phenomena, Vol. 72 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), paper TuC5.

Haus, H. A.

Huang, C. P.

Huang, C.-P.

Ippen, E. P.

Kaertner, F. X.

Kapteyn, H. C.

Kärtner, F. X.

T. R. Schibli, L. M. Matos, F. J. Grawert, J. G. Fujimoto, and F. X. Kärtner, in Ultrafast Phenomena, Vol. 72 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), paper TuC5.

Kean, P. N.

Keller, U.

Libertun, A. R.

A. R. Libertun, R. Shelton, H. C. Kapteyn, and M. M. Murnane, in Conference on Lasers and Electro-Optics (CLEO), 1999 (Optical Society of America, Washington, D.C., 1999), pp. 469–470.

Matos, L. M.

T. R. Schibli, L. M. Matos, F. J. Grawert, J. G. Fujimoto, and F. X. Kärtner, in Ultrafast Phenomena, Vol. 72 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), paper TuC5.

Matuschek, N.

Morgner, U.

Mourier-Genoud, F.

Murnane, M. M.

Read, K.

Riccelli, N.

Scheuer, V.

Schibli, T. R.

T. R. Schibli, L. M. Matos, F. J. Grawert, J. G. Fujimoto, and F. X. Kärtner, in Ultrafast Phenomena, Vol. 72 of OSA Trends in Optics and Photonics Series (Optical Society of America, Washington, D.C., 2002), paper TuC5.

Shelton, R.

A. R. Libertun, R. Shelton, H. C. Kapteyn, and M. M. Murnane, in Conference on Lasers and Electro-Optics (CLEO), 1999 (Optical Society of America, Washington, D.C., 1999), pp. 469–470.

Sibbett, W.

Spence, D. E.

Steinmeyer, G.

Stoev, V. D.

Sutter, D. H.

Taft, G.

Tschudi, T.

Tscudi, T.

Zhou, J.

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Figures (3)

Fig. 1
Fig. 1

Schematic diagram of the ultralow-threshold Ti:Al2O3 laser. The pump lens has a 50-mm focal length, and the folding mirrors have 7.5-cm radii of curvature (ROC). The cavity is an astigmatically compensated X design, with arm lengths of 130 and 162 cm for the highly reflecting (HR) arm and the prism arm, respectively. A pair of fused-silica (FS) prisms separated by 45 cm is used for compensating and tuning intracavity dispersion. The output coupler is 1%. The Kerr-lens mode-locking threshold is 156 mW of pump power.

Fig. 2
Fig. 2

Output versus pump power for mode-locked and cw operation. The use of a double-pass pump configuration, retroreflecting the unabsorbed pump light, increases the cw output power by approximately two times. Mode-locked operation is achieved with as little as 156 mW of pump power.

Fig. 3
Fig. 3

Right, interferometric autocorrelation measurement of a 14.0-fs pulse (assuming a sech2 fit) generated with 200 mW of pump power. Left, the corresponding output spectrum at 91 nm FWHM.

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