Sat, 05 Jul 2008 12:22:37 BST CiteULike: dhbradshaw's laser_pointer http://www.citeulike.org/user/dhbradshaw/tag/laser_pointer CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dhbradshaw/article/1428871 <i>Science, Vol. 301, No. 5635. (2003), pp. 940-943.</i> A Quantum Laser Pointer Hans Bachor Claude Fabre Ping Lam Nicolas Treps Nicolai Grosse Warwick Bowen Science, Vol. 301, No. 5635. (2003), pp. 940-943. 2007-07-02T14:40:08-00:00 2003 Science 301 5635 940 943 coherent laser laser_pointer measurement quantum squeezed http://www.citeulike.org/user/dhbradshaw/article/1428869 <i>Physical Review Letters, Vol. 88, No. 20. (2002), 203601.</i><br /><br />Using continuous wave superposition of spatial modes; we demonstrate experimentally displacement measurement of a light beam below the standard quantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed beam and a coherent beam that are spatially orthogonal. Although the resultant beam is not squeezed; it is shown to have strong internal spatial correlations. We show that the position of such a light beam can be measured using a split detector with an increased precision compared to a classical beam. This method can be used to improve the sensitivity of small displacement measurements. Surpassing the Standard Quantum Limit for Optical Imaging Using Nonclassical Multimode Light N Treps U Andersen B Buchler PK Lam A Maã®tre HA Bachor C Fabre Physical Review Letters, Vol. 88, No. 20. (2002), 203601. 2007-07-02T14:40:08-00:00 2002 Physical Review Letters 88 20 203601 American Physical Society laser_pointer quantum spatial squeezed http://www.citeulike.org/user/dhbradshaw/article/1428868 <i>Physical Review Letters, Vol. 88, No. 9. (2002), 093601.</i><br /><br />We report the first direct experimental characterization of continuous variable quantum Stokes parameters. We generate a continuous wave light beam with more than 3 dB of simultaneous squeezing in three of the four Stokes parameters. The polarization squeezed beam is produced by mixing two quadrature squeezed beams on a polarizing beam splitter. Depending on the squeezed quadrature of these two beams the quantum uncertainty volume on the Poincaré sphere becomes a âcigarlikeâ or âpancakelikeâ ellipsoid. Polarization Squeezing of Continuous Variable Stokes Parameters Warwick Bowen Roman Schnabel Hans Bachor Ping Lam Physical Review Letters, Vol. 88, No. 9. (2002), 093601. 2007-07-02T14:40:08-00:00 2002 Physical Review Letters 88 9 093601 American Physical Society laser_pointer opa polarization spatial squeezed http://www.citeulike.org/user/dhbradshaw/article/1428867 <i>Optics Letters, Vol. 25, No. 1. (2000), pp. 76-78.</i><br /><br />We consider the problem of the measurement of very small displacements in the transverse plane of an optical image with a split photodetector. We show that the standard quantum limit for such a measurement, which is equal to the diffraction limit divided by the square root of the number of photons used in the measurement, cannot be overcome by use of ordinary single-mode squeezed light. We give the form of possible multimode nonclassical states of light, enabling us to enhance by orders of magnitude the resolution of such a measurement beyond the standard quantum limit. Quantum limits in the measurement of very small displacements in optical images C Fabre JB Fouet A Maître Optics Letters, Vol. 25, No. 1. (2000), pp. 76-78. 2007-07-02T14:40:08-00:00 2000 Optics Letters 25 1 76 78 laser_pointer http://www.citeulike.org/user/dhbradshaw/article/963646 <i>Optics Letters, Vol. 25, No. 1. (2000), pp. 76-78.</i><br /><br />We consider the problem of the measurement of very small displacements in the transverse plane of an optical image with a split photodetector. We show that the standard quantum limit for such a measurement, which is equal to the diffraction limit divided by the square root of the number of photons used in the measurement, cannot be overcome by use of ordinary single-mode squeezed light. We give the form of possible multimode nonclassical states of light, enabling us to enhance by orders of magnitude the resolution of such a measurement beyond the standard quantum limit. Quantum limits in the measurement of very small displacements in optical images C Fabre JB Fouet A Maître Optics Letters, Vol. 25, No. 1. (2000), pp. 76-78. 2006-11-27T18:02:29-00:00 2000 Optics Letters 25 1 76 78 laser_pointer http://www.citeulike.org/user/dhbradshaw/article/942271 <i>Applied Physics Letters, Vol. 36, No. 2. (1980), pp. 130-132.</i><br /><br />A new thermo-optical method based on the sensitive detection of thermal gradients adjacent to heated sample surfaces is described. Room- and low-temperature experiments were performed using this technique, and its advantages over different methods are discussed. Applied Physics Letters is copyrighted by The American Institute of Physics. doi:10.1063/1.91395 PACS: 78.20.Nv, 07.65.-b, 44.30.+v, 67.40.Pm Additional Information Full Text: [ PDF (262 kB) Thermo-optical spectroscopy: Detection by the ”mirage effect” AC Boccara D Fournier J Badoz doi:10.1063/1.91395 Applied Physics Letters, Vol. 36, No. 2. (1980), pp. 130-132. 2006-11-13T23:38:46-00:00 1980 Applied Physics Letters 36 2 130 132 AIP displacement laser_pointer spatial squeezed http://www.citeulike.org/user/dhbradshaw/article/942268 <i>Physical Review Letters, Vol. 88, No. 9. (13 February 2002), 093601.</i><br /><br />We report the first direct experimental characterization of continuous variable quantum Stokes parameters. We generate a continuous wave light beam with more than 3 dB of simultaneous squeezing in three of the four Stokes parameters. The polarization squeezed beam is produced by mixing two quadrature squeezed beams on a polarizing beam splitter. Depending on the squeezed quadrature of these two beams the quantum uncertainty volume on the Poincaré sphere becomes a âcigarlikeâ or âpancakelikeâ ellipsoid. Polarization Squeezing of Continuous Variable Stokes Parameters Warwick Bowen Roman Schnabel Hans-A Bachor Ping Lam doi:10.1103/PhysRevLett.88.093601 Physical Review Letters, Vol. 88, No. 9. (13 February 2002), 093601. 2006-11-13T23:34:00-00:00 2002 Physical Review Letters 88 9 093601 American Physical Society laser_pointer opa polarization spatial squeezed http://www.citeulike.org/user/dhbradshaw/article/797023 <i>Physical Review Letters, Vol. 88, No. 20. (3 May 2002), 203601.</i><br /><br />Using continuous wave superposition of spatial modes; we demonstrate experimentally displacement measurement of a light beam below the standard quantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed beam and a coherent beam that are spatially orthogonal. Although the resultant beam is not squeezed; it is shown to have strong internal spatial correlations. We show that the position of such a light beam can be measured using a split detector with an increased precision compared to a classical beam. This method can be used to improve the sensitivity of small displacement measurements. Surpassing the Standard Quantum Limit for Optical Imaging Using Nonclassical Multimode Light N Treps U Andersen B Buchler PK Lam A Maã®tre HA Bachor C Fabre doi:10.1103/PhysRevLett.88.203601 Physical Review Letters, Vol. 88, No. 20. (3 May 2002), 203601. 2006-08-11T08:52:02-00:00 2002 Physical Review Letters 88 20 203601 American Physical Society laser_pointer quantum spatial squeezed http://www.citeulike.org/user/dhbradshaw/article/797058 <i>Science, Vol. 301, No. 5635. (15 August 2003), pp. 940-943.</i><br /><br />The measurement sensitivity of the pointing direction of a laser beam is ultimately limited by the quantum nature of light. To reduce this limit, we have experimentally produced a quantum laser pointer, a beam of light whose direction is measured with a precision greater than that possible for a usual laser beam. The laser pointer is generated by combining three different beams in three orthogonal transverse modes, two of them in a squeezed-vacuum state and one in an intense coherent field. The result provides a demonstration of multichannel spatial squeezing, along with its application to the improvement of beam positioning sensitivity and, more generally, to imaging. 10.1126/science.1086489 A Quantum Laser Pointer Nicolas Treps Nicolai Grosse Warwick Bowen Claude Fabre Hans-A Bachor Ping Lam doi:10.1126/science.1086489 Science, Vol. 301, No. 5635. (15 August 2003), pp. 940-943. 2006-08-11T09:33:37-00:00 2003 Science 301 5635 940 943 coherent laser laser_pointer measurement quantum squeezed