用于同步原子干涉仪的锁相、低噪声、频率捷变钛宝石激光器
Phase-Locked, Low-Noise, Frequency Agile Titanium: Sapphire Lasers for Simultaneous Atom Interferometers
摘要:
利用腔内电光相位调制器实现了两台功率大于1.6W的钛宝石激光器的相位锁定,在1 MHz处的相位噪声为-138dBc/Hz。从1 Hz到10 kHz,剩余相位方差为2.5 × 10^(-8 rad ^2。在200 ns内实现高达4 MHz的瞬时偏移频率步长。同步原子干涉仪可以通过抑制光学振动的常见影响,在差分测量中充分利用这种超低相位噪声。
英文摘要:
We demonstrate phase lock of two >1.6W Titanium:sapphire lasers with a phase noise of -138dBc/Hz at 1MHz from the carrier, using an intra-cavity electro-optic phase modulator. The residual phase variance is 2.5 10^(-8)rad^2 integrated from 1Hz to 10kHz. Instantaneous offset frequency steps of up to 4MHz are achieved within 200ns. Simultaneous atom interferometers can make full use of this ultra-low phase noise in differential measurements by suppressing common influences from vibration of optics.
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