Patents by Inventor Silvia Maria Pietralunga
Silvia Maria Pietralunga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8975508Abstract: A solar concentrator (1) having a longitudinal axis of extension (3) and a cross-section at right angles to the longitudinal axis substantially equal for a continuum of cross-sections, and comprising a reflective system (6) and a refractive system (7), the reflective system forming an optical inlet (8) and an optical outlet (9) and comprising two semi-portions positioned specularly relative to the plane of symmetry, where the cross-section profile of the refractive system is a triangle (11) having a base (12) at the optical outlet (9) and apex (13) on the axis of symmetry (5), where the cross-section profile of each semi-portion of the reflective system comprises a segment (18) in the shape of a parabola having an axis (20) forming with the axis of symmetry an acceptance angle (?0) greater than zero and a focus (F) on the axis of symmetry, and where the focus falls inside the triangle.Type: GrantFiled: August 22, 2012Date of Patent: March 10, 2015Assignee: Fondazione Centro Internazionale Della Fotonica per EnergiaInventors: Giorgio Grasso, Francesco Morichetti, Silvia Maria Pietralunga, Aldo Righetti, Maria Chiara Ubaldi
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Publication number: 20140209148Abstract: A solar concentrator (1) having a longitudinal axis of extension (3) and a cross-section at right angles to the longitudinal axis substantially equal for a continuum of cross-sections, and comprising a reflective system (6) and a refractive system (7), the reflective system forming an optical inlet (8) and an optical outlet (9) and comprising two semi-portions positioned specularly relative to the plane of symmetry, where the cross-section profile of the refractive system is a triangle (11) having a base (12) at the optical outlet (9) and apex (13) on the axis of symmetry (5), where the cross-section profile of each semi-portion of the reflective system comprises a segment (18) in the shape of a parabola having an axis (20) forming with the axis of symmetry an acceptance angle (?0) greater than zero and a focus (F) on the axis of symmetry, and where the focus falls inside the triangle.Type: ApplicationFiled: August 22, 2012Publication date: July 31, 2014Applicant: FONDAZIONE CENTRO INTERNAZIONALE DELLA FOTONICA PER ENERGIAInventors: Giorgio Grasso, Francesco Morichetti, Silvia Maria Pietralunga, Aldo Righetti, Maria Chiara Ubaldi
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Patent number: 7528360Abstract: A polarization stabilizing device and method based on controlling the phase retardations of a pair of variable rotators with an optically interposed quarter-wave plate, with a controller such that the first of the variable rotators has its phase retardation switched between first and second values whenever the phase retardation of the second of the variable rotators reaches an upper or a lower limit. The upper and lower limits of the second rotator and the first and second values of the first rotator are chosen so that discontinuities in the power of the output optical radiation are avoided when the first variable rotator is switched, thereby providing endless polarization stabilization using rotators that themselves may have limited retardation ranges.Type: GrantFiled: September 6, 2005Date of Patent: May 5, 2009Assignee: PGT Photonics S.p.A.Inventors: Mario Martinelli, Paolo Martelli, Silvia Maria Pietralunga, Aldo Righetti
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Patent number: 7324267Abstract: A wavelength converter device is provided for generating a converted radiation at frequency ?g through interaction between at least one signal radiation at frequency ?s and at least one pump radiation at frequency ?p, including an input for the at least one signal radiation at frequency ?s, a pump light source for generating the at least one pump radiation at frequency ?p, an output for taking out the converted radiation at frequency ?g, a structure for transmitting the signal radiation, including two optical resonators having a non-linear material, having an optical length of at least 40*?/2, ? being the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies ?p, ?s and ?g, wherein by propagating through the structure, the pump and signal radiation generate the converted radiation by non-linear interaction within the optical resonators.Type: GrantFiled: June 28, 2002Date of Patent: January 29, 2008Assignee: Pirelli & C. S.p.A.Inventors: Andrea Melloni, Francesco Morichetti, Silvia Maria Pietralunga, Mario Martinelli
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Patent number: 7307722Abstract: A polarization stabilizing device and method based on controlling the phase retardation of a pair of variable phase retarders with a controller such that the first of the variable retarders has its phase retardation switched between first and second values whenever the phase retardation of the second of the variable retarders reaches an upper or a lower limit. The upper and lower limits of the second retarder and the first and second values of the first retarder are chosen so that discontinuities in the power of the output optical signal are avoided when the first variable retarder is switched, thereby providing endless polarization stabilization using phase retarders that themselves have only limited retardation ranges.Type: GrantFiled: July 30, 2002Date of Patent: December 11, 2007Assignee: Pirelli & C. S.p.A.Inventors: Mario Martinelli, Paolo Martelli, Silvia Maria Pietralunga
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Patent number: 7209607Abstract: Optical switch matrix having at least an input matrix port defining at least a row of the matrix, a plurality of output matrix ports defining columns of the matrix, a plurality of switching elements, each one being disposed at the intersection of at least one row and one of the columns. Each switch element in a predetermined position of the matrix, in an activated condition, connects an input matrix port to an output matrix port, the ports being correspondents respectively to the predetermined position of the matrix.Type: GrantFiled: November 30, 2001Date of Patent: April 24, 2007Assignee: Pirelli & C. S.p.A.Inventors: Mario Martinelli, Andrea Paganini, Silvia Maria Pietralunga, Andrea Zappettini
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Patent number: 7099069Abstract: An electro-optic (EO) device having a high-resistivity semiconducting crystal and a method of operating such a device. The local shielding of the externally applied field lowers the EO effect, which can be partially or completely inhibited particularly in the low-frequency regime, i.e., less than about 105 Hz. By holding a high-resistivity semiconducting crystal at a suitable temperature, EO response and efficiency are improved, in particular for light signals that are non-modulated or modulated at low frequencies. Preferably, the temperature at which the semiconducting crystal is held during functioning is between 50 and 150° C. Enhancement of the EO effect has been demonstrated also for EO devices operating at relatively large optical powers, i.e., larger than about 0.1 mW.Type: GrantFiled: December 18, 2001Date of Patent: August 29, 2006Assignee: Pirelli & C. S.p.A.Inventors: Andrea Zappettini, Silvia Maria Pietralunga, Enos Gombia
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Patent number: 6872794Abstract: The invention relates to new polymers useful in non linear optical (NLO) applications, particularly as optical waveguide materials.Type: GrantFiled: October 11, 2002Date of Patent: March 29, 2005Assignee: Pirelli Cavi e Sistemi S.p.A.Inventors: Andrea Zappettini, Silvia Maria Pietralunga, Yuri Dubitsky, Antonio Zaopo, Mario Martinelli
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Publication number: 20040262499Abstract: A polarization stabilizing device and method based on controlling the phase retardation of a pair of variable phase retarders with a controller such that the first of the variable retarders has its phase retardation switched between first and second values whenever the phase retardation of the second of the variable retarders reaches an upper or a lower limit. The upper and lower limits of the second retarder and the first and second values of the first retarder are chosen so that discontinuities in the power of the output optical signal are avoided when the first variable retarder is switched, thereby providing endless polarization stabilization using phase retarders that themselves have only limited retardation ranges.Type: ApplicationFiled: August 9, 2004Publication date: December 30, 2004Inventors: Mario Martinelli, Paolo Martelli, Silvia Maria Pietralunga
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Publication number: 20030103759Abstract: The invention relates to new polymers useful in non linear optical (NLO) applications, particularly as optical waveguide materials.Type: ApplicationFiled: October 11, 2002Publication date: June 5, 2003Inventors: Andrea Zappettini, Silvia Maria Pietralunga, Yuri Dubitsky, Antonio Zaopo, Mario Martinelli
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Patent number: 6181429Abstract: There is provided a method and apparatus for measuring the optical properties of bulk samples. A probe laser beam is fed into the two arms of the apparatus, a reference arm and a measurement arm, both of which contain optical fiber to conduct the laser lights. The measurement arm includes a free space area for mounting a sample to be tested. The probe beam is directed into the sample in free space. The sample also receives light in free space, rather than via the optical fiber, from a second, pump laser. The interaction of the sample and the pump laser affect the optical properties of the sample. This change in optical properties can be detected by comparing the output signals from the measurement and reference arms.Type: GrantFiled: December 22, 1998Date of Patent: January 30, 2001Assignee: Pirelli Cavi e Sistemi S.p.A.Inventors: Angelo Barberis, Stefano Caselli, Silvia Maria Pietralunga, Mario Martinelli