Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
1999-05-24
2001-05-22
Ullah, Akm E. (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C359S330000, C372S022000
Reexamination Certificate
active
06236779
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to fiber delivery of ultra-short pulses, and more particularly to the use of photonic crystal fibers in an ultra-short pulse delivery system.
2. Description of Related Art
Fiber delivery systems are desirable for laser systems to provide convenient delivery of an output beam to a target distanced from the source. In particular, for ultra-short pulse lasers, a limiting factor in fiber delivery is the dispersion of the optical fiber.
At wavelengths of less than 1.27 microns, all step-index fibers have normal dispersion. In this regime, the ultra-short pulses broaden substantially while propagating in a fiber of lengths as short as a few meters. Prism or grating pairs, which provide anomalous dispersion, have been used to compensate the dispersion of the fiber. However, this increases complexity and cost and in the case of grating pairs, is inefficient. Additionally, with a tunable laser, the prism or grating pair requires adjustment as the wavelength is tuned.
There have been suggestions to use photonic crystal fibers to shift the zero dispersion wavelength to shorter values. In “Group-velocity dispersion in photonic crystal fibers”, by D. Mogilevtsev, T. A. Birks and P. St. J. Russell, in Optics Letters 23, 1662 (1998) it is suggested that this may be useful in telecommunication systems. In “Efficient visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm”, by J. K. Ranka, R. S. Windeler and A. J. Stentz, Postdeadline paper at CLEO 1999 (Optical Society of America), it is shown that in combination with a Ti:sapphire laser, novel non-linear effects are possible.
There is a need for a fiber delivery system for delivering ultra-short laser pulses. As a result, there is a need for a fiber that has an appropriate value of dispersion at wavelengths where common ultra-short pulse lasers operate.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a fiber delivery system for delivering ultra-short pulses.
Another object of the present invention is to provide a fiber delivery system with a fiber that has an appropriate value of dispersion at wavelengths where common ultra-short lasers operate.
These and other objects of the invention are achieved in a system that delivers sub-picosecond pulses. Included is a source that produces an output beam of sub-picosecond pulses at a wavelength no greater than 1.27 microns. A photonic crystal fiber is coupled to the source to receive the output beam.
REFERENCES:
patent: 5365366 (1994-11-01), Kafka et al.
patent: 5847861 (1998-12-01), Kafka et al.
patent: 6075915 (2000-06-01), Koops et al.
patent: 6097870 (2000-08-01), Ranka et al.
patent: WO 99/00685 (1999-07-01), None
“ Group-velocity dispersion in photonic crystal fibers” by Mogiilevtsev et al., Optical sociiety of America vol. 23 No. 21′ pp 1662-1664, Nov. 1998.*
Wadsworth, W. et al., “Soliton effects in photonic crystal fibres at 850nm”,Electronics Letters, vol. 36, No. 1, Jan. 6, 2000, pp. 53-55.
Gander, M. et al., “Experimental measurement of group velocity dispersion in photonic crystal fibre”,Electronics Letters, vol. 35, No. 1, Jan. 7, 1999, pp. 63-64.
Monro, T. et al., “Efficient modelling of holey fibers”, Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communications, vol. 4, Feb. 1999, pp. 111-113.
Ferrando, A. et al., “Designing a photonic crystal fibre with flattened chromatic dispersion”,Electronics Letters, vol. 35, No. 4, Feb. 18, 1999, pp. 325-327.
Beaud, P. et al., “Ultrashort Pulse Propagation, Pulse Breakup, and Fundamental Soliton Formation in a Single-Mode Optical Fiber”,IEEE Journal of Quantum Electronics, vol. QE-23, No. 11, Nov. 1987, pp. 1938-1946.
Ranka, Jinendrak, et al., “Efficient visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm”, Bell Labs/Lucent Tec. (Murray Hill ND, p. 1-2, May 25, 1999).
Mogilevtsev, T.A., et al., “Group-velocity dispersion in photonic crystal fibers”, Optics letters, Optical Society of America, vol. 23 (No. 21), p. 1662-1664 (Nov. 1, 1998).
Knight, J.C., et al. “All-silica single-mode optical fiber with photonic crystal fibers”, Optics Letters, Optical Soc. of America, vol. 21 (No. 19), p. 1547-1549, (Oct. 1, 1996).
Birks, T.A., et al., “Endlessly single-mode photonic crystal fiber”, Optical Soc. of America, vol. 22 (No. 13), p. 961-963 (Jul. 1, 1997).
Birks, T.A., et al., “Single-mode photonic crystal fiber with an indefinitely large core”, CLEO '98, p. 226-227 (May 6, 1998).
Kafka James D.
Spence David E.
Spectra Physics Lasers, Inc.
Ullah Akm E.
Wilson Sonsini Goodrich & Rosati
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