Abstract

An improved laser setup for reliable dual-wavelength cross mode locking is reported. We obtain two perfectly synchronized pulse trains that are independently tunable over a wavelength interval as wide as 100 nm and with pulse durations below 30 fs. The pulses are shown to be cross correlated with interferometric accuracy, thus demonstrating an astonishing potential of the nonlinear coupling mechanism.

© 1995 Optical Society of America

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References

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1994 (4)

1993 (4)

1991 (1)

1990 (1)

1989 (1)

V. V. Afanasjev, E. M. Dianov, V. N. Serkin, IEEE J. Quantum Electron. 25, 2656 (1989).
[CrossRef]

1983 (1)

Afanasjev, V. V.

V. V. Afanasjev, E. M. Dianov, V. N. Serkin, IEEE J. Quantum Electron. 25, 2656 (1989).
[CrossRef]

Anderson, D.

Becker, P. C.

Brabec, T.

See, for example, C. Spielmann, P. F. Curley, T. Brabec, F. Krausz, IEEE J. Quantum Electron. 30, 1100 (1994).
[CrossRef]

Burns, D.

Christov, I. P.

Curley, P. F.

See, for example, C. Spielmann, P. F. Curley, T. Brabec, F. Krausz, IEEE J. Quantum Electron. 30, 1100 (1994).
[CrossRef]

Darack, S. B.

de Barros, M. R. X.

Dianov, E. M.

V. V. Afanasjev, E. M. Dianov, V. N. Serkin, IEEE J. Quantum Electron. 25, 2656 (1989).
[CrossRef]

Dykaar, D. R.

Evans, J. M.

Gordon, J. P.

Höök, A.

Huang, C.

Kapteyn, H. C.

Kean, P. N.

Knox, W. H.

Krausz, F.

See, for example, C. Spielmann, P. F. Curley, T. Brabec, F. Krausz, IEEE J. Quantum Electron. 30, 1100 (1994).
[CrossRef]

A. Stingl, C. Spielmann, F. Krausz, Opt. Lett. 19, 204 (1994).
[CrossRef] [PubMed]

Lisak, M.

Murnane, M. M.

Serkin, V. N.

V. V. Afanasjev, E. M. Dianov, V. N. Serkin, IEEE J. Quantum Electron. 25, 2656 (1989).
[CrossRef]

Sibbett, W.

Spence, D. E.

Spielmann, C.

A. Stingl, C. Spielmann, F. Krausz, Opt. Lett. 19, 204 (1994).
[CrossRef] [PubMed]

See, for example, C. Spielmann, P. F. Curley, T. Brabec, F. Krausz, IEEE J. Quantum Electron. 30, 1100 (1994).
[CrossRef]

Stingl, A.

Taft, G.

Yagi, T.

Zhang, Z.

Zhou, J.

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Figures (5)

Fig. 1
Fig. 1

Experimental setup of the dual-wavelength femtosecond Ti:sapphire laser. BS, beam splitter; λ/2, half-wave plate for fine tuning of the absorbed pump power; L, focusing lens (f = 10 cm); EM, end mirror; FM1, FM2, folding mirrors; G, gain medium (Ti:sapphire); P1a–P2b, dispersing prisms; S1, S2, adjustable slits for wavelength tuning; OC1, OC2, output couplers. OC1 and G are mounted on translation stages.

Fig. 2
Fig. 2

Routinely obtained pulse durations versus wavelengths in the cross-coupled mode of operation. For branch 1 (filled circles) the peak of the reflectivity of the output mirror is located at 800 nm. In branch 2 (filled triangles) we use an output coupler centered at 700 nm to achieve good tunability in the short-wavelength regime. The solid curves are to guide the eye.

Fig. 3
Fig. 3

Fringe-resolved autocorrelations and spectra (insets) of the shortest pulses that we measured with synchronized laser operation near the two limits of the tuning range for (a) branch 1 and (b) branch 2. Pulse durations are calculated assuming Gaussian pulse shapes.

Fig. 4
Fig. 4

Intensity cross correlation (filled circles) of coupled pulses with τ1 = 30 fs and τ2 = 64 fs centered at λ1 = 830 nm and λ2 = 760 nm. The solid curve represents a Gaussian fit to the data. The wing of the curve (dashed line) indicates an experimental time resolution of 10 fs in pump and probe experiments.

Fig. 5
Fig. 5

Interferometric cross-correlation and related spectra (inset). Pulse durations are τ1 = 42 fs and τ2 = 45 fs. The modulation depth of the fringes is consistent with a jitter of 1.7 fs between the two pulse trains.

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