K
F
Last name: KÉFÉLIAN
First name: Fabien
We show the existence and explain the origin of a fundamental frequency noise floor at the tens of millihertz level when a low noise laser is locked on an unbalanced long-fiber-based Michelson interferometer.
Nous présentons une méthode permettant d'asservir simultanément sur un interféromètre deux lasers séparés d'une fréquence micro-onde. Cette méthode repose sur l'utilisation de la technique Pound- Drever-Hall [2] qui est très largement utilisée pour l'asservissement sur les cavités Fabry-Perot. Les deux lasers sont des diodes lasers bas bruit...
We show the existence and explain the origin of a fundamental frequency noise floor at the tens of millihertz level when a low noise laser is locked on an unbalanced long-fiber-based Michelson interferometer.
We report on a new 100-W solid state 1064-nm amplifier integrated in Advanced VIRGO pre-stabilized laser system. Short and long term stability parameters comply with gravitational wave detector requirements. Impact of pump transport is discussed.
Summary form only given. VIRGO is a 3-km-arm laser interferometer for gravitational wave detection in the 20 Hz-5 kHz frequency band. Its second-generation version, Advanced VIRGO, aims at reducing the detector noise by a factor of ten compared to the first generation, with the progressive deployment of new technologies and equipment [1]. The...
Nous présentons l'asservissement simultané de deux lasers à 1542 nm sur un interféromètre à bobine de fibre de 300 m par la méthode Pound-Drever-Hall.
Summary form only given. VIRGO is a 3-km-arm laser interferometer for gravitational wave detection in the 20 Hz-5 kHz frequency band. Its second-generation version, Advanced VIRGO, aims at reducing the detector noise by a factor of ten compared to the first generation, with the progressive deployment of new technologies and equipment [1]. The...
We present the results of numerical simulations to investigate the noise impact of the residual nonlinearity of a fiber delay line based optical discriminator when the interferometer is used to lock the frequency of a laser. Results are compared to experimental measurements
Advanced Virgo est la version de seconde génération du détecteur d'ondes gravitationnelles Virgo. Sa sensibilité est accrue d'un facteur 10, grâce notamment à l'augmentation de la puissance optique. Un amplificateur 95 W a été étudié et caractérisé. Ses performances mesurées son compatibles avec les exigences du nouveau système laser pré-stabilisé.
We present the results of the transfer of the frequency noise of one laser on an other laser over 18 nm using a fiber based heterodyne interferometer using a simple mixer to generate an error signal. The minimum noise level of the transfer is 0.2 Hz/Hz^0.5. We investigate the different contributions to the noise floor of the experiment.
We characterized the out-of-loop frequency noise of a Pound-Drever-Hall lock to a fiber-based delay-line interferometer and demonstrated a reduction of the floor of this out-of-loop locking noise below 10^(-1) Hz/√Hz on a Fourier frequency range extended to 8 kHz.
International audience
Second generation of laser interferometer gravitational wave detectors can now detect the fusion of compact stellar object pair weekly. To increase the sensitivity, an important change of design between first and second generation gravitational wave detectors is the use of homodyne detection instead of heterodyne. This modification has strongly...
International audience