The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Arianna Bramati - One of the best experts on this subject based on the ideXlab platform.

  • Optimal Intensity Noise reduction in multimode vertical-cavity surface-emitting lasers by polarization-selective attenuation
    Optics letters, 2004
    Co-Authors: Marco Romanelli, Elisabeth Giacobino, Arianna Bramati
    Abstract:

    We study in detail the effect of the anticorrelation of the polarization modes on the total Intensity Noise of a vertical-cavity surface-emitting laser. We show that small polarization-dependent losses can greatly improve the total Intensity Noise, and we determine and experimentally demonstrate the conditions necessary for optimal Intensity Noise reduction.

  • Intensity Noise of injected nd yvo4 microchip lasers
    European Physical Journal D, 2002
    Co-Authors: Arianna Bramati, J P Hermier, V Jost, Elisabeth Giacobino
    Abstract:

    The combined effects of the pump Noise suppression and injection locking technique on the Intensity Noise of a diode pumped Nd:YVO4 microchip laser are theoretically and experimentally investigated. Complete cancellation of the relaxation oscillation peak is experimentally achieved. Very good agreement between experimental results and theoretical predictions of a fully quantum model describing lasers with injected signal is found.

  • quantum Intensity Noise of laser diodes
    1996
    Co-Authors: Philippe Grangier, T C Zhang, Ph J Poizat, Arianna Bramati, F Marin, Elisabeth Giacobino
    Abstract:

    We have investigated the quantum Intensity Noise of free-running, cavity- extended, and injection-locked single mode laser diodes at room temperature. No squeezing was observed for free-running diodes, while the two line narrowing techniques yielded a measured Intensity squeezing of about 1.4 dB below shot Noise. However, we have observed that the Intensity Noise of such nominally “single mode” laser diodes results from a cancellation effect between large anticorrelated fluctuations of the main mode and of many weak longitudinal side modes. Therefore, depending on the line narrowing technique which is used, the observed Noise reduction may not be single mode squeezing.

  • Pump-blocking and Intensity Noise in semiconductor lasers
    Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504), 1
    Co-Authors: I. Maurin, Arianna Bramati, Jean-pierre Hermier, Elisabeth Giacobino
    Abstract:

    Semiconductor lasers are particularly well suited for the implementation of pump-Noise suppression since it is possible to drive them with a current the Noise of which is well below shot Noise. Indeed, if the quantum efficiency of the carrier-to-photon conversion is high enough, the electron statistics of the pumping can be transferred to the light emission, yielding a reduction of the Intensity Noise in the laser. In this simple picture, the maximal amount of squeezing is equal to the quantum efficiency. However, experimental results on Intensity Noise reduction by pump-Noise suppression are usually above this limit. This discrepancy suggests that additional Noise sources must be involved. We have investigated the recently proposed "pump-blocking" effect. If the carrier number rises above its stationary value, more of the injected carriers find occupied quantum states, and therefore less of them are allowed into the active layer. These excess carriers are a source of Noise and hinder the pump-Noise suppression. They also give rise to a voltage Noise across the laser diode that we have experimentally measured.

Klaus J. Boller - One of the best experts on this subject based on the ideXlab platform.

  • Low-Intensity-Noise operation of Nd:YVO 4 microchip lasers by pump-Noise suppression
    Journal of the Optical Society of America B, 1999
    Co-Authors: Christoph Becher, Klaus J. Boller
    Abstract:

    We report on near-quantum-limited Intensity Noise of Nd:YVO4 microchip lasers pumped with pump-Noise-suppressed diode lasers. The low-frequency Intensity Noise of the microchip lasers is found to depend on mode correlation effects in the absorbed radiation from the diode laser pump source. A minimum Intensity Noise of 0.5 dB above the standard quantum-Noise limit at a frequency of 250 kHz is obtained by pumping with a grating-feedback diode laser. An accurate description of the measured Intensity-Noise spectra by a quantum-mechanical Langevin rate-equation model is achieved by consideration of the nonlinear gain saturation that is due to the finite lifetime of the lower laser level.

  • Intensity Noise properties of Nd:YVO 4 microchip lasers pumped with an amplitude squeezed diode laser
    Optics Communications, 1998
    Co-Authors: Christoph Becher, Klaus J. Boller
    Abstract:

    Abstract We report on Intensity Noise measurements of single-frequency Nd:YVO 4 microchip lasers optically pumped with amplitude squeezed light from an injection-locked diode laser. Calibrated homodyne measurements show a minimum Intensity Noise of 10.1 dB above the SQL at a frequency of 100 kHz. The measured Intensity Noise spectra are described with high accuracy by a theoretical model based on the quantum mechanical Langevin rate equations, including classical and quantum Noise sources.

Pascal Besnard - One of the best experts on this subject based on the ideXlab platform.

  • Relative Intensity Noise in a multi-Stokes Brillouin laser
    Optics Express, 2018
    Co-Authors: Ananthu Sebastian, Irina Balakireva, Schadrac Fresnel, Stephane Trebaol, Pascal Besnard
    Abstract:

    We investigate the relative Intensity Noise (RIN) properties of a multi-Stokes Brillouin fiber ring laser. We experimentally analyse the Intensity Noise of each Stokes wave and study the Noise dynamics of the cascaded Brillouin scattering process. We observe up to 20 dB/Hz Intensity Noise reduction compared to that of the RIN input pump laser. We examine the impact of the fiber ring quality factor on the laser RIN features such as amplitude reduction and relaxation frequency. We also investigate the influence of the Brillouin gain detuning on the RIN reduction. A numerical model based on a set of coupled-mode equations replicates the experimental observations. Our study enables us to determine the optimal parameter values to operate the multi-Stokes laser in the low Noise regime.

  • Relative Intensity Noise in a Multi-Stokes Brillouin Laser
    Optics express, 2018
    Co-Authors: Ananthu Sebastian, Schadrac Fresnel, Stephane Trebaol, Irina V. Balikereva, Pascal Besnard
    Abstract:

    We investigate the Relative Intensity Noise (RIN) properties of a multi-Stokes Brillouin fiber ring laser. We experimentally analyse Intensity Noise of each Stokes waves and study the Noise dynamics of the cascaded Brillouin scattering process. We observe up to 20 dB/Hz Intensity Noise reduction compared to that of the RIN input pump laser. We examine the impact of the fiber ring quality factor on the laser RIN features such as amplitude reduction and relaxation frequency. A numerical model based on a set of coupled-mode equations replicate the experimental observations; confirming the class B like behavior of a multi-Stokes Brillouin laser. Our study enables to determine the optimal parameter values to operate the multi-Stokes laser in the low Noise regime.

  • relative Intensity Noise of multiwavelength fibre laser
    Electronics Letters, 2004
    Co-Authors: Julien Poëtte, S Blin, G Brochu, Laurent Bramerie, Radan Slavik, J C Simon, Sophie Larochelle, Pascal Besnard
    Abstract:

    Relative Intensity Noise of a six-channel multiwavelength distributed Fabry-Perot fibre laser is compared to the Noise of a singlemode distributed feedback fibre laser. The Noise characteristics of individual channels are similar to that of the singlemode laser, offering a low-cost and compact solution for wavelength multiplexing applications without Noise penalty.

  • Relative Intensity Noise of Multi-wavelength Fiber Laser
    Electronics Letters, 2004
    Co-Authors: Julien Poëtte, S Blin, G Brochu, Laurent Bramerie, Radan Slavik, J C Simon, Sophie La Rochelle, Pascal Besnard
    Abstract:

    Relative Intensity Noise of a six-channel multiwavelength distributed Fabry-Perot fibre laser is compared to the Noise of a singlemode distributed feedback fibre laser. The Noise characteristics of individual channels are similar to that of the singlemode laser, offering a low-cost and compact solution for wavelength multiplexing applications without Noise penalty.

S Swirhun - One of the best experts on this subject based on the ideXlab platform.

Kenichi Iga - One of the best experts on this subject based on the ideXlab platform.

  • Intensity Noise and polarization stability of GaAlAs-GaAs surface emitting lasers
    IEEE Journal of Quantum Electronics, 1991
    Co-Authors: Fumio Koyama, K. Morito, Kenichi Iga
    Abstract:

    The Intensity Noise characteristics of GaAlAs-GaAs vertical cavity surface emitting (SE) lasers have been investigated. A low-Intensity Noise of -145 dB/Hz was obtained with an output power of 2.2 mW. The spontaneous emission factor is estimated to be 2*10/sup -5/, both from the bias dependence of the Intensity Noise and from the relative mode Intensity below threshold. This is in good agreement with theoretical expectation. The possibility of low-Noise operation of a microcavity SE laser with an extremely low output power of less than approximately 100 mu W is shown. The polarization stability of the surface emitting laser is demonstrated by measuring the Intensity fluctuations of an individual polarization state. >