Abstract

We investigate the nonlinear interactions between pulses of two different wavelengths within a single cross-mode-locked femtosecond Ti:sapphire laser. We show that the nonlinear interaction caused by self-focusing can correct for a difference in cavity lengths of as much as ±3 μm, corresponding to 20% of the pulse width on each round trip. Further, we show that the concept of mean group delay can be extended to a pair of pulses with disparate spectra and spatial distribution in a nonlinear regenerative system.

© 1994 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]

1993 (4)

1992 (2)

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

W. H. Knox, Opt. Lett. 17, 514 (1992).
[CrossRef] [PubMed]

1991 (1)

1988 (1)

Becker, P. C.

Burns, D.

Darack, S. B.

de Barros, M. R. X.

Dykaar, D. R.

Evans, J. M.

Fujimoto, J. G.

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

Gordon, J. P.

Haus, H. A.

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

Ippen, E. P.

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

Kean, P. N.

Knox, W. H.

Ouellette, F.

Piché, M.

Sibbett, W.

Spence, D. E.

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Figures (4)

Fig. 1
Fig. 1

(a) Simplified conceptual schematic; A and B denote the two cavities. (b), (c) Schematics of the top and side views, respectively, of the two-color cross-mode-locked cavity. As shown, the actual beam overlap in the laser rod occurs only in the wings of the spatial distribution.

Fig. 2
Fig. 2

(a) Frequency (repetition rate) versus time. Initially both cavities’ repetition rates track, as one cavity length is changed, until the locking limit is reached. Then both cavities relax to their unperturbed repetition rates until the adjustable cavity length is brought back inside the capture range. The bottom curve shows schematically the corresponding piezo position. (b) In this case we permit one beam to relax to the unperturbed state by blocking the second beam. Once unblocked, even cw operation is sufficient to pull the repetition rate.

Fig. 3
Fig. 3

Repetition rate pulling schematic. In the locked condition the individual pulses behave as if they have a single mean wavelength and group delay.

Fig. 4
Fig. 4

Spectra taken of both beams simultaneously at the cavity detuning maxima, ~6-μm total offset.

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