Signal Gain

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Claudio Paoloni - One of the best experts on this subject based on the ideXlab platform.

  • On the Analysis and Improvement of Yield for TWT Small-Signal Gain
    IEEE Transactions on Electron Devices, 2008
    Co-Authors: Claudio Paoloni
    Abstract:

    Traveling-wave tube (TWT) performance is sensibly affected by fabrication tolerances. An accurate yield evaluation and comprehension of the factors that contribute to yield degradation is fundamental to avoid excess costs in the fabrication process. In this paper, a procedure to evaluate and improve the yield of multisection helix TWTs in the design phase will be proposed, assuming a small-Signal Gain performance goal as the design target. An extended set of fabrication parameters is considered to provide a reliable estimate of the manufacturing tolerance effect on the final result. The introduction of yield sensitivity histograms together with cathode voltage adjustment demonstrates a relevant TWT yield improvement, together with indications on which fabrication step requires higher accuracy.

  • On the influence of electron‐beam parameters on TWT small‐Signal Gain
    Microwave and Optical Technology Letters, 2002
    Co-Authors: Stefano D'agostino, Claudio Paoloni
    Abstract:

    The electron beam is one of the main components in traveling-wave tubes (TWTs). A study on the influence of the parameters related to the electron beam on small-Signal Gain of TWTs is proposed. In particular, the effect of the variations of electron-beam voltage, the perveance of the electron gun, and electron beam radius are investigated. A five-section TWT was considered in the study.

  • A study on helix pitch tolerance impact on TWT small-Signal Gain
    IEEE Electron Device Letters, 2002
    Co-Authors: Stefano D'agostino, Claudio Paoloni
    Abstract:

    Traveling-wave tubes (TWTs) consist of several sections with different helix pitch to provide the required small-Signal Gain. An extensive study aiming to improve the comprehension of the effect of the helix pitch manufacturing tolerances on the TWT small-Signal Gain has been completed. The obtained results demonstrate the relevant impact on the TWT small-Signal Gain when the helix pitch deviates from its nominal value and allow devising a tuning procedure for the realized tubes.

  • Helix wire tolerances in TWT small-Signal Gain prediction
    Microwave and Optical Technology Letters, 2001
    Co-Authors: Stefano D'agostino, Claudio Paoloni
    Abstract:

    Small-Signal Gain is an important characteristic within the framework of overall travelling-wave tube (TWT) performance. The fabrication tolerances can determine different performances with respect to the required ones. In this letter an accurate evaluation of the effect of the helix wire tolerances on the TWT small-Signal Gain is proposed. The study is applied to a measured five-section TWT working in the 10-13 GHz frequency band. (C) 2001 John Wiley & Sons. Inc.

  • sensitivity analysis of twt s small Signal Gain based on the effect of rod shape and dimensions
    IEEE Transactions on Electron Devices, 2000
    Co-Authors: Stefano Dagostino, Francesco Emma, Claudio Paoloni
    Abstract:

    An extensive study aiming at analyzing the effect of rod shapes and dimensions on the Gain of helix traveling wave tubes (TWTs) is performed. The evaluation of tube small-Signal Gain is obtained by making use of a rigorous field analysis which takes into account the helix tape model and the dielectric inhomogeneous loading conditions. Computing time to perform the analysis is extremely low compared with the time required in the case of a full wave, three-dimensional (3-D) electromagnetic simulator. The accuracy of the simulation approach has been extensively verified in a previous paper. A novel expression for the attenuation constant has been introduced in the model to improve the quality of results. The proposed study allows a better understanding of tube behavior before fabrication highlighting the contribution of the shape, the mechanical tolerances and the /spl epsiv//sub r/ variation of the rods to the small-Signal Gain.

Alain Brun - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and experimental investigations of small-Signal Gain for a diode-pumped Q-switched Cr:LiSAF laser
    IEEE Journal of Quantum Electronics, 1997
    Co-Authors: François Balembois, Franck Falcoz, F. Kerboull, Frédéric Druon, Patrick Georges, Alain Brun
    Abstract:

    We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-Signal Gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-Signal Gain obtained with a new simple method. We have then optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest Gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 /spl mu/J at 10 kHz) between 800 and 900 nm.

  • Small-Signal Gain investigations for a continuous-wave diode-pumped Q-switched Cr:LiSAF laser
    Optics letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of fluorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 μJ at a repetition rate of 10 kHz.

  • Small Signal Gain optimization for a Q-switched Cr:LiSAF oscillator pumped by cw laser diodes
    1996
    Co-Authors: Franck Falcoz, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    Summary form only given. In Q-switched lasers, one of the most important parameters is the small Signal Gain in the laser medium that determines the buildup time and the energy of the pulse. In Cr:LiSAF crystal, the small Signal Gain dramatically depends on the pumping configuration and on physical limits imposed by up-conversion process and by thermal quenching of fluorescence. In this work, we have developed an experimental method for the investigation of small Signal Gain per round-trip in situ (i.e. inside the cavity). We next defined the best pumping configuration for a 3% doped Cr:LiSAF crystal pumped by two diodes emitting 400 mW each at 670 nm.

  • Small Signal Gain investigations for a continuous-wave diode-pumped Q:switch Cr:LiSAF laser
    Optics Letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of f luorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 mJ at a repetition rate of 10 kHz

Franck Falcoz - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and experimental investigations of small-Signal Gain for a diode-pumped Q-switched Cr:LiSAF laser
    IEEE Journal of Quantum Electronics, 1997
    Co-Authors: François Balembois, Franck Falcoz, F. Kerboull, Frédéric Druon, Patrick Georges, Alain Brun
    Abstract:

    We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-Signal Gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-Signal Gain obtained with a new simple method. We have then optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest Gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 /spl mu/J at 10 kHz) between 800 and 900 nm.

  • Small-Signal Gain investigations for a continuous-wave diode-pumped Q-switched Cr:LiSAF laser
    Optics letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of fluorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 μJ at a repetition rate of 10 kHz.

  • Small Signal Gain optimization for a Q-switched Cr:LiSAF oscillator pumped by cw laser diodes
    1996
    Co-Authors: Franck Falcoz, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    Summary form only given. In Q-switched lasers, one of the most important parameters is the small Signal Gain in the laser medium that determines the buildup time and the energy of the pulse. In Cr:LiSAF crystal, the small Signal Gain dramatically depends on the pumping configuration and on physical limits imposed by up-conversion process and by thermal quenching of fluorescence. In this work, we have developed an experimental method for the investigation of small Signal Gain per round-trip in situ (i.e. inside the cavity). We next defined the best pumping configuration for a 3% doped Cr:LiSAF crystal pumped by two diodes emitting 400 mW each at 670 nm.

  • Small Signal Gain investigations for a continuous-wave diode-pumped Q:switch Cr:LiSAF laser
    Optics Letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of f luorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 mJ at a repetition rate of 10 kHz

François Balembois - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and experimental investigations of small-Signal Gain for a diode-pumped Q-switched Cr:LiSAF laser
    IEEE Journal of Quantum Electronics, 1997
    Co-Authors: François Balembois, Franck Falcoz, F. Kerboull, Frédéric Druon, Patrick Georges, Alain Brun
    Abstract:

    We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-Signal Gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-Signal Gain obtained with a new simple method. We have then optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest Gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 /spl mu/J at 10 kHz) between 800 and 900 nm.

  • Small-Signal Gain investigations for a continuous-wave diode-pumped Q-switched Cr:LiSAF laser
    Optics letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of fluorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 μJ at a repetition rate of 10 kHz.

  • Small Signal Gain optimization for a Q-switched Cr:LiSAF oscillator pumped by cw laser diodes
    1996
    Co-Authors: Franck Falcoz, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    Summary form only given. In Q-switched lasers, one of the most important parameters is the small Signal Gain in the laser medium that determines the buildup time and the energy of the pulse. In Cr:LiSAF crystal, the small Signal Gain dramatically depends on the pumping configuration and on physical limits imposed by up-conversion process and by thermal quenching of fluorescence. In this work, we have developed an experimental method for the investigation of small Signal Gain per round-trip in situ (i.e. inside the cavity). We next defined the best pumping configuration for a 3% doped Cr:LiSAF crystal pumped by two diodes emitting 400 mW each at 670 nm.

  • Small Signal Gain investigations for a continuous-wave diode-pumped Q:switch Cr:LiSAF laser
    Optics Letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of f luorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 mJ at a repetition rate of 10 kHz

F. Kerboull - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical and experimental investigations of small-Signal Gain for a diode-pumped Q-switched Cr:LiSAF laser
    IEEE Journal of Quantum Electronics, 1997
    Co-Authors: François Balembois, Franck Falcoz, F. Kerboull, Frédéric Druon, Patrick Georges, Alain Brun
    Abstract:

    We present a theoretical model proving that up-conversion and thermal quenching of fluorescence strongly limit small-Signal Gain in a CW pumped Cr:LiSAF laser. We have a good agreement with experimental measurements of small-Signal Gain obtained with a new simple method. We have then optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. The highest Gain, 1.11 at 600 mW of absorbed pump power, is obtained if the pump spot is circularized inside the crystal and if the Cr:LiSAF is pumped on both sides. In Q-switched operation, this laser produces tunable pulses (up to 6.5 /spl mu/J at 10 kHz) between 800 and 900 nm.

  • Small-Signal Gain investigations for a continuous-wave diode-pumped Q-switched Cr:LiSAF laser
    Optics letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of fluorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 μJ at a repetition rate of 10 kHz.

  • Small Signal Gain investigations for a continuous-wave diode-pumped Q:switch Cr:LiSAF laser
    Optics Letters, 1996
    Co-Authors: Franck Falcoz, F. Kerboull, Frédéric Druon, François Balembois, Patrick Georges, Alain Brun
    Abstract:

    We measured small-Signal Gain in a cw diode-pumped Cr:LiSAF and showed that upconversion and thermal quenching of f luorescence strongly limit small-Signal Gain. Then we optimized the Gain in a Cr:LiSAF laser pumped by two 400-mW red diodes. In Q-switched operation, this laser produced tunable nanosecond pulses between 800 and 900 nm. At 850 nm, we obtained 230-ns pulses with an energy of 6.5 mJ at a repetition rate of 10 kHz

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