The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Jean-paul Pocholle - One of the best experts on this subject based on the ideXlab platform.
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Oscillation regimes of a solid-state ring laser with active beat note stabilization : from a chaotic device to a ring laser gyroscope
2017Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Jean-paul PocholleAbstract:We report experimental and theoretical study of a rotating diode-pumped Nd-YAG ring laser with active beat note stabilization. Our experimental setup is described in the usual Maxwell-Bloch formalism. We analytically derive a stability condition and some frequency response characteristics for the solid-state ring laser gyroscope, illustrating the important role of mode coupling effects on the dynamics of such a device. Experimental data are presented and compared with the theory on the basis of realistic laser parameters, showing a very good agreement. Our results illustrate the duality between the very rich non linear dynamics of the diode-pumped solid-state ring laser (including chaotic behavior) and the possibility to obtain a very stable beat note, resulting in a potentially new kind of Rotation Sensor.
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Mode coupling control in a resonant device: application to solid-state ring lasers
Physical Review Letters, 2006Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Philippe Bouyer, Alain Aspect, Jean-paul PocholleAbstract:A theoretical and experimental investigation of the effects of mode coupling in a resonant macro- scopic quantum device is achieved in the case of a ring laser. In particular, we show both analytically and experimentally that such a device can be used as a Rotation Sensor provided the effects of mode coupling are controlled, for example through the use of an additional coupling. A possible general- ization of this example to the case of another resonant macroscopic quantum device is discussed.
Sylvain Schwartz - One of the best experts on this subject based on the ideXlab platform.
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Oscillation regimes of a solid-state ring laser with active beat note stabilization : from a chaotic device to a ring laser gyroscope
2017Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Jean-paul PocholleAbstract:We report experimental and theoretical study of a rotating diode-pumped Nd-YAG ring laser with active beat note stabilization. Our experimental setup is described in the usual Maxwell-Bloch formalism. We analytically derive a stability condition and some frequency response characteristics for the solid-state ring laser gyroscope, illustrating the important role of mode coupling effects on the dynamics of such a device. Experimental data are presented and compared with the theory on the basis of realistic laser parameters, showing a very good agreement. Our results illustrate the duality between the very rich non linear dynamics of the diode-pumped solid-state ring laser (including chaotic behavior) and the possibility to obtain a very stable beat note, resulting in a potentially new kind of Rotation Sensor.
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An online compensation algorithm for improving the performance of gas ring laser gyroscopes
2017Co-Authors: Noad El Badaoui, Gilles Feugnet, Bertrand Morbieu, Pierre Rouchon, Fabien Bretenaker, Philippe Martin, Sylvain SchwartzAbstract:The gas Ring Laser Gyroscope is an excellent in- ertial Rotation Sensor. Nevertheless, its accuracy at low angular velocities is limited by the (very small) imperfections of the mirrors forming its optical cavity. In this paper, we propose to compensate the effect of these imperfections thanks to an online estimation of the system parameters. The estimator is designed on a suitable simplification of the model, in which the parameters appear linearly, and its convergence is proved. The relevance of the approach is illustrated in simulation; in particular, it is seen that good performance can be achieved even with lower quality mirrors.
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Mode coupling control in a resonant device: application to solid-state ring lasers
Physical Review Letters, 2006Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Philippe Bouyer, Alain Aspect, Jean-paul PocholleAbstract:A theoretical and experimental investigation of the effects of mode coupling in a resonant macro- scopic quantum device is achieved in the case of a ring laser. In particular, we show both analytically and experimentally that such a device can be used as a Rotation Sensor provided the effects of mode coupling are controlled, for example through the use of an additional coupling. A possible general- ization of this example to the case of another resonant macroscopic quantum device is discussed.
K. Venkateswara - One of the best experts on this subject based on the ideXlab platform.
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low frequency tilt seismology with a precision ground Rotation Sensor
Seismological Research Letters, 2018Co-Authors: M. P. Ross, K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, J. S. Kissel, Jim Warner, H. Radkins, Michael W. Coughlin, T Shaffer, Paul BodinAbstract:We describe measurements of the Rotational component of teleseismic surface waves using an inertial high‐precision ground‐Rotation Sensor installed at the Laser Interferometer Gravitational‐Wave Observatory (LIGO) Hanford Observatory (LHO). The Sensor has a noise floor of 0.4 nrad/√Hz at 50 mHz and a translational coupling of less than 1 μrad/m enabling translation‐free measurement of small Rotations. We present observations of the Rotational motion from Rayleigh waves of six teleseismic events from varied locations and with magnitudes ranging from M 6.7 to 7.9. These events were used to estimate phase dispersion curves that show agreement with a similar analysis done with an array of three STS‐2 seismometers also located at LHO.
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Low‐Frequency Tilt Seismology with a Precision Ground‐Rotation Sensor
Seismological Research Letters, 2017Co-Authors: M. P. Ross, K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, J. S. Kissel, Jim Warner, H. Radkins, T. J. Shaffer, Michael W. Coughlin, Paul BodinAbstract:We describe measurements of the Rotational component of teleseismic surface waves using an inertial high‐precision ground‐Rotation Sensor installed at the Laser Interferometer Gravitational‐Wave Observatory (LIGO) Hanford Observatory (LHO). The Sensor has a noise floor of 0.4 nrad/√Hz at 50 mHz and a translational coupling of less than 1 μrad/m enabling translation‐free measurement of small Rotations. We present observations of the Rotational motion from Rayleigh waves of six teleseismic events from varied locations and with magnitudes ranging from M 6.7 to 7.9. These events were used to estimate phase dispersion curves that show agreement with a similar analysis done with an array of three STS‐2 seismometers also located at LHO.
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Low Frequency Tilt Seismology with a Precision Ground Rotation Sensor
arXiv: Geophysics, 2017Co-Authors: M. P. Ross, K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, J. S. Kissel, Jim Warner, H. Radkins, T. J. Shaffer, Michael W. Coughlin, Paul BodinAbstract:We describe measurements of the Rotational component of teleseismic surface waves using an inertial high-precision ground-Rotation-Sensor installed at the LIGO Hanford Observatory (LHO). The Sensor has a noise floor of 0.4 nrad$/ \sqrt{\rm Hz}$ at 50 mHz and a translational coupling of less than 1 $\mu$rad/m enabling translation-free measurement of small Rotations. We present observations of the Rotational motion from Rayleigh waves of six teleseismic events from varied locations and with magnitudes ranging from M6.7 to M7.9. These events were used to estimate phase dispersion curves which shows agreement with a similar analysis done with an array of three STS-2 seismometers also located at LHO.
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subtracting tilt from a horizontal seismometer using a ground Rotation Sensor
Bulletin of the Seismological Society of America, 2017Co-Authors: K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, Jim Warner, H. Radkins, T Shaffer, B. Lantz, Jeffery Kissel, R. Mittleman, Fabrice MatichardAbstract:Abstract We demonstrate the use of a high‐precision ground‐Rotation Sensor to subtract wind‐induced tilt noise in a horizontal broadband seismometer at frequencies above 10 mHz. The measurement was carried out at the LIGO Hanford Observatory using a low‐frequency flexure‐beam‐balance with an autocollimator readout and a T240 seismometer, located in close proximity to each other. Along their common horizontal axis, the two instruments show significant coherence below 100 mHz, which increases as a function of wind speed due to floor tilt induced by wind pressure on the walls of the building and the ground outside. Under wind speeds of 10–15 m/s, correcting the seismometer for measured ground Rotation lowered the signal by a factor of ∼10, between 10 and 100 mHz. This article describes the instruments used, shows representative data for low and high wind speeds, and discusses the tilt subtraction and possible limitations.
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Subtracting Tilt from a Horizontal Seismometer Using a Ground‐Rotation Sensor
Bulletin of the Seismological Society of America, 2017Co-Authors: K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, Jim Warner, H. Radkins, T. J. Shaffer, B. Lantz, Jeffery Kissel, R. Mittleman, Fabrice MatichardAbstract:Abstract We demonstrate the use of a high‐precision ground‐Rotation Sensor to subtract wind‐induced tilt noise in a horizontal broadband seismometer at frequencies above 10 mHz. The measurement was carried out at the LIGO Hanford Observatory using a low‐frequency flexure‐beam‐balance with an autocollimator readout and a T240 seismometer, located in close proximity to each other. Along their common horizontal axis, the two instruments show significant coherence below 100 mHz, which increases as a function of wind speed due to floor tilt induced by wind pressure on the walls of the building and the ground outside. Under wind speeds of 10–15 m/s, correcting the seismometer for measured ground Rotation lowered the signal by a factor of ∼10, between 10 and 100 mHz. This article describes the instruments used, shows representative data for low and high wind speeds, and discusses the tilt subtraction and possible limitations.
Fabrice Matichard - One of the best experts on this subject based on the ideXlab platform.
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subtracting tilt from a horizontal seismometer using a ground Rotation Sensor
Bulletin of the Seismological Society of America, 2017Co-Authors: K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, Jim Warner, H. Radkins, T Shaffer, B. Lantz, Jeffery Kissel, R. Mittleman, Fabrice MatichardAbstract:Abstract We demonstrate the use of a high‐precision ground‐Rotation Sensor to subtract wind‐induced tilt noise in a horizontal broadband seismometer at frequencies above 10 mHz. The measurement was carried out at the LIGO Hanford Observatory using a low‐frequency flexure‐beam‐balance with an autocollimator readout and a T240 seismometer, located in close proximity to each other. Along their common horizontal axis, the two instruments show significant coherence below 100 mHz, which increases as a function of wind speed due to floor tilt induced by wind pressure on the walls of the building and the ground outside. Under wind speeds of 10–15 m/s, correcting the seismometer for measured ground Rotation lowered the signal by a factor of ∼10, between 10 and 100 mHz. This article describes the instruments used, shows representative data for low and high wind speeds, and discusses the tilt subtraction and possible limitations.
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Subtracting Tilt from a Horizontal Seismometer Using a Ground‐Rotation Sensor
Bulletin of the Seismological Society of America, 2017Co-Authors: K. Venkateswara, C. A. Hagedorn, Jens H. Gundlach, Jim Warner, H. Radkins, T. J. Shaffer, B. Lantz, Jeffery Kissel, R. Mittleman, Fabrice MatichardAbstract:Abstract We demonstrate the use of a high‐precision ground‐Rotation Sensor to subtract wind‐induced tilt noise in a horizontal broadband seismometer at frequencies above 10 mHz. The measurement was carried out at the LIGO Hanford Observatory using a low‐frequency flexure‐beam‐balance with an autocollimator readout and a T240 seismometer, located in close proximity to each other. Along their common horizontal axis, the two instruments show significant coherence below 100 mHz, which increases as a function of wind speed due to floor tilt induced by wind pressure on the walls of the building and the ground outside. Under wind speeds of 10–15 m/s, correcting the seismometer for measured ground Rotation lowered the signal by a factor of ∼10, between 10 and 100 mHz. This article describes the instruments used, shows representative data for low and high wind speeds, and discusses the tilt subtraction and possible limitations.
Gilles Feugnet - One of the best experts on this subject based on the ideXlab platform.
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Oscillation regimes of a solid-state ring laser with active beat note stabilization : from a chaotic device to a ring laser gyroscope
2017Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Jean-paul PocholleAbstract:We report experimental and theoretical study of a rotating diode-pumped Nd-YAG ring laser with active beat note stabilization. Our experimental setup is described in the usual Maxwell-Bloch formalism. We analytically derive a stability condition and some frequency response characteristics for the solid-state ring laser gyroscope, illustrating the important role of mode coupling effects on the dynamics of such a device. Experimental data are presented and compared with the theory on the basis of realistic laser parameters, showing a very good agreement. Our results illustrate the duality between the very rich non linear dynamics of the diode-pumped solid-state ring laser (including chaotic behavior) and the possibility to obtain a very stable beat note, resulting in a potentially new kind of Rotation Sensor.
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An online compensation algorithm for improving the performance of gas ring laser gyroscopes
2017Co-Authors: Noad El Badaoui, Gilles Feugnet, Bertrand Morbieu, Pierre Rouchon, Fabien Bretenaker, Philippe Martin, Sylvain SchwartzAbstract:The gas Ring Laser Gyroscope is an excellent in- ertial Rotation Sensor. Nevertheless, its accuracy at low angular velocities is limited by the (very small) imperfections of the mirrors forming its optical cavity. In this paper, we propose to compensate the effect of these imperfections thanks to an online estimation of the system parameters. The estimator is designed on a suitable simplification of the model, in which the parameters appear linearly, and its convergence is proved. The relevance of the approach is illustrated in simulation; in particular, it is seen that good performance can be achieved even with lower quality mirrors.
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Mode coupling control in a resonant device: application to solid-state ring lasers
Physical Review Letters, 2006Co-Authors: Sylvain Schwartz, Gilles Feugnet, Evguenii Lariontsev, Philippe Bouyer, Alain Aspect, Jean-paul PocholleAbstract:A theoretical and experimental investigation of the effects of mode coupling in a resonant macro- scopic quantum device is achieved in the case of a ring laser. In particular, we show both analytically and experimentally that such a device can be used as a Rotation Sensor provided the effects of mode coupling are controlled, for example through the use of an additional coupling. A possible general- ization of this example to the case of another resonant macroscopic quantum device is discussed.
