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An agile laser with ultra-low frequency noise and high sweep linearity

An agile laser with ultra-low frequency noise and high sweep linearity,10.1364/OE.18.003284,Optics Express,Haifeng Jiang,Fabien Kéfélian,Pierre Lemond

An agile laser with ultra-low frequency noise and high sweep linearity   (Citations: 2)
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We report on a fiber-stabilized agile laser with ultra-low frequency noise. The frequency noise power spectral density is comparable to that of an ultra-stable cavity stabilized laser at Fourier frequencies higher than 30 Hz. When it is chirped at a constant rate of ~ 40 MHz/s, the max non-linearity frequency error is about 50 Hz peak-to-peak over more than 600 MHz tuning range. The Rayleigh backscattering is found to be a significant frequency noise source dependent on fiber length, chirping rate and the power imbalance of the interferometer arms. We analyze this effect both theoretically and experimentally and put forward techniques to reduce this noise contribution.
Journal: Optics Express - OPT EXPRESS , vol. 18, no. 4, 2010
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    • ...Recently we demonstrated that the fiber-stabilized laser showed a comparable frequency noise to the one obtained by PDH locking to a high-finesse cavity for Fourier frequency from 40 Hz to 30 kHz and a level below 1Hz 2 /Hz at 1Hz [4, 5]...

    T. Liet al. Low vibration sensitivity fiber spools for laser stabilization

    • ...We attribute the bright peaks to localized stray reflections in the interferometers [14]...
    • ...We deeply investigate this effect theoretically in the case of chirped laser [14]...
    • ...We proved that the observed widths of steps match exactly the value expected from the equation (2) [14]...
    • ...In [14] we determined the relative non linear term due to chromatic dispersion and we showed that this effect is negligible in comparison with the residual fiber delay fluctuation due to temperature, vibrations and parasitic Fabry-Perot effect...
    • ...We found that beyond 10 MHz/s, the non-linear error is below 1 part per million (ppm) (see Fig.5b). More details are given in [14]...

    A. Habouchaet al. An ultra-low frequency noise agile laser

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