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. 2017 Jan 9;7:39966. doi: 10.1038/srep39966

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(a) Absolute phase noise of the Ti:sapphire laser (scaled to 2.856-GHz). (b) Absolute phase noise of the RF oscillator. (c) Residual phase noise between the laser and the RF oscillator measured by the out-of-loop FLOM-PD. (d) Absolute phase noise of the locked Ti:sapphire laser (measured by photodiode and signal source analyser). Note that the data for >20 kHz is limited by the measurement noise floor. (e) Background noise floor of the FLOM-PD. (f) Integrated residual timing jitter of synchronization (integration of curve (c)). (g) Integrated absolute timing jitter of RF-locked optical pulse train (combining curve (d) in the 10 Hz–20 kHz and curve (a) in the 20 kHz–1 MHz).