Richard Fork | University of Alabama in Huntsville (original) (raw)
Papers by Richard Fork
Journal of the Optical Society of America B, 1995
A passively mode-locked dual-core fiber ring laser, similar to that first proposed by Walton [Opt... more A passively mode-locked dual-core fiber ring laser, similar to that first proposed by Walton [Opt. Lett. 17, 1688 (1992)], is numerically simulated, incorporating losses and higher-order effects. Ultrashort hyperbolic secantlike pulses with negligible chirp are generated by this laser. The laser operation is robust but not self-starting; lasing action is found even when stimulated Raman scattering and changes in the cavity length are included. The pulse amplitude, phase, and pulse spectrum are discussed.
We propose augmentation of the principal investigator's "parent" contract with the ... more We propose augmentation of the principal investigator's "parent" contract with the Air Force in the form of support for one additional graduate student. The student would perform numerical simulations and modeling relevant to the use of ultrashort optical pulses to observe a remote object at high data rate. The work would relate specifically to our recent experimental demonstration of a kinematically modelocked nonlinear loop mirror laser utilizing erbium doped fiber. This technology provides a strategy for realizing a sensitive means for sensing the motion of a remote object. The student would seek a better description of the internal dynamics of the nonlinear loop mirror laser and would examine strategies that might more fully utilize the potential of this physical behavior. Relevance to recent and ongoing work would also be addressed.
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Proceedings of the IEEE, 2000
ABSTRACT
Revue de Physique Appliquée, 1987
The user has requested enhancement of the downloaded file.
A laser is described comprising means for defining a single optical resonator; a saturable gain m... more A laser is described comprising means for defining a single optical resonator; a saturable gain medium; an absorbing element optically coupled to the gain medium; the absorbing element being capable of deep saturation; means optically coupled to the absorbing element for deeply saturating the absorbing element; and means for generating group velocity dispersion to balance self phase modulation generated within the laser. The group velocity dispersion has a sign opposite to that of the self phase modulation. The saturable gain medium, the absorbing element and the group velocity dispersion generating means are positioned within the single optical resonator to facilitate optical coupling therebetween. The saturable gain medium and absorbing element restrict an optical pulse from the laser to have soliton type pulse shaping in the fundamental soliton mode.
Means of steering high power optical beams by means of compact low mass technology suitable for s... more Means of steering high power optical beams by means of compact low mass technology suitable for spacecraft and microspacecraft were addressed. Non-mechanical means were sought that permit redirection of the beam over half space in times of the order of 1 microsecond or less. The effort included means for steering of optical pulses as well as continuous optical beams. The large apertures needed in space applications and the interest in structures having minimum mass and volume required attention to thin film structures with rapid switching capability that could produce large group delay in a compact structure. Mechanisms for both group delay and phase delay control were examined. New technology was identified in the form of a novel microresonator based switching element employing photonic band structures. The technology explored appears consistent with extrapolation to high average power, e.g., multi-megawatts. The work examined double clad optical fiber as the amplifying element, bu...
Contains reports on two research projects.
Science, 1970
The phototropic response and distribution of photopigment in the sporangiophore of Phycomyces was... more The phototropic response and distribution of photopigment in the sporangiophore of Phycomyces was investigated with a microillumination pattern. The data support the hypothesis that phototropism results from greater stimulation of growth in regions of more intense illumination and indicate that the photoreceptor extends to the outer wall of the sporangiophore.
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](Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 1980
IEEE Journal of Quantum Electronics, 2000
Chemical Physics Letters, 1978
ABSTRACT
Solar pumped solid state lasers for space solar power-Experimental path. Richard L Fork, Wesley W... more Solar pumped solid state lasers for space solar power-Experimental path. Richard L Fork, Wesley W Walker, Rustin L Laycock, Jason JA Green, Spencer T Cole 54 th International Astronautical Congress of the International Astronautical Federation(IAF), 2003. ...
Journal of the Optical Society of America a, 1987
Journal of the Optical Society of America B, 1995
A passively mode-locked dual-core fiber ring laser, similar to that first proposed by Walton [Opt... more A passively mode-locked dual-core fiber ring laser, similar to that first proposed by Walton [Opt. Lett. 17, 1688 (1992)], is numerically simulated, incorporating losses and higher-order effects. Ultrashort hyperbolic secantlike pulses with negligible chirp are generated by this laser. The laser operation is robust but not self-starting; lasing action is found even when stimulated Raman scattering and changes in the cavity length are included. The pulse amplitude, phase, and pulse spectrum are discussed.
We propose augmentation of the principal investigator's "parent" contract with the ... more We propose augmentation of the principal investigator's "parent" contract with the Air Force in the form of support for one additional graduate student. The student would perform numerical simulations and modeling relevant to the use of ultrashort optical pulses to observe a remote object at high data rate. The work would relate specifically to our recent experimental demonstration of a kinematically modelocked nonlinear loop mirror laser utilizing erbium doped fiber. This technology provides a strategy for realizing a sensitive means for sensing the motion of a remote object. The student would seek a better description of the internal dynamics of the nonlinear loop mirror laser and would examine strategies that might more fully utilize the potential of this physical behavior. Relevance to recent and ongoing work would also be addressed.
The user has requested enhancement of the downloaded file.
Proceedings of the IEEE, 2000
ABSTRACT
Revue de Physique Appliquée, 1987
The user has requested enhancement of the downloaded file.
A laser is described comprising means for defining a single optical resonator; a saturable gain m... more A laser is described comprising means for defining a single optical resonator; a saturable gain medium; an absorbing element optically coupled to the gain medium; the absorbing element being capable of deep saturation; means optically coupled to the absorbing element for deeply saturating the absorbing element; and means for generating group velocity dispersion to balance self phase modulation generated within the laser. The group velocity dispersion has a sign opposite to that of the self phase modulation. The saturable gain medium, the absorbing element and the group velocity dispersion generating means are positioned within the single optical resonator to facilitate optical coupling therebetween. The saturable gain medium and absorbing element restrict an optical pulse from the laser to have soliton type pulse shaping in the fundamental soliton mode.
Means of steering high power optical beams by means of compact low mass technology suitable for s... more Means of steering high power optical beams by means of compact low mass technology suitable for spacecraft and microspacecraft were addressed. Non-mechanical means were sought that permit redirection of the beam over half space in times of the order of 1 microsecond or less. The effort included means for steering of optical pulses as well as continuous optical beams. The large apertures needed in space applications and the interest in structures having minimum mass and volume required attention to thin film structures with rapid switching capability that could produce large group delay in a compact structure. Mechanisms for both group delay and phase delay control were examined. New technology was identified in the form of a novel microresonator based switching element employing photonic band structures. The technology explored appears consistent with extrapolation to high average power, e.g., multi-megawatts. The work examined double clad optical fiber as the amplifying element, bu...
Contains reports on two research projects.
Science, 1970
The phototropic response and distribution of photopigment in the sporangiophore of Phycomyces was... more The phototropic response and distribution of photopigment in the sporangiophore of Phycomyces was investigated with a microillumination pattern. The data support the hypothesis that phototropism results from greater stimulation of growth in regions of more intense illumination and indicate that the photoreceptor extends to the outer wall of the sporangiophore.
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 1980
IEEE Journal of Quantum Electronics, 2000
Chemical Physics Letters, 1978
ABSTRACT
Solar pumped solid state lasers for space solar power-Experimental path. Richard L Fork, Wesley W... more Solar pumped solid state lasers for space solar power-Experimental path. Richard L Fork, Wesley W Walker, Rustin L Laycock, Jason JA Green, Spencer T Cole 54 th International Astronautical Congress of the International Astronautical Federation(IAF), 2003. ...
Journal of the Optical Society of America a, 1987