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DIRECT DEMONSTRATION OF PICOSECOND‐PULSE FREQUENCY SWEEP
1.E. B. Treacy, Phys. Letters 28A, 34 (1968).
2.E. B. Treacy, Appl. Phys. Letters 14, 112 (1969).
3.Such effects could be caused by self‐phase modulation occurring (a) in the chlorobenzene used as the mode‐locking dye solvent; see for example F. DeMartini, C. H. Townes, T. K. Gustafson, and P. L. Kelley, Phys. Rev. 164, 312 (1967) and
3.R. A. Fisher, P. L. Kelley, and T. K. Gustafson, Appl. Phys. Letters 14, 140 (1969);
3.or (b) in the glass; see M. A. Duguay, J. W. Hansen, and S. L. Shapiro, IEEE J. Quantum Electron. (to be published).
4.Examples are normal and anomalous dispersion in the glass and in the dye cell. Normal dispersion is considered by Rinaldo R. Cubeddu and Orazio Svelto, IEEE J. Quantum Electron. QE‐5, 495 (1969).
5.The glass was American Optical Type 850 which had been reannealed after extensive use. The laser was mode‐locked with Eastman 9740 dye dissolved in chlorobenzene.
6.The weighting function across the pulse train that governs the measurement at any one wavelength may be wavelength‐dependent.
7.R. R. Alfano and S. L. Shapiro, Phys. Rev. Letters 24, 592 (1970).
8.F. Gires and P. Tournois, Compt. Rend. Acad. Sci. (Paris) 258, 6112 (1964).
8.See also M. A. Duguay and J. W. Hansen, Appl. Phys. Letters 14, 14 (1969).
9.E. B. Treacy, IEEE J. Quantum Electron. QE‐5, 454 (1969).
10.J. A. Giordmaine, P. M. Rentzepis, S. L. Shapiro, and K. W. Wecht, Appl. Phys. Letters 11, 216 (1967).
10.See also A. J. DeMaria, W. H. Glenn, M. J. Brienza, and M. E. Mack, Proc. IEEE 57, 2 (1969).
11.The two‐photon absorption spectrum of the Rhodamine 6G in ethylene dichloride used here has not yet been measured.
12.S. L. Shapiro and M. A. Duguay, Phys. Letters 28A, 698 (1969).
13.A sharp edge or spike in the envelope would contribute to the spectrogram a time‐independent feature with large bandwidth.
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