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A Method for Improving the Laser Diffraction Efficiency during Frequency Shifting

机译:一种提高移频时激光衍射效率的方法

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The cold atomic fountain experiment requires frequency shifting of the cooling light. This experiment needs to shift laser frequency of the cooling light to 115MHz. In order to meet this requirement, DDS is chosen as the driving source of AOM. For the existing AD9852 chip, as the core chip of DDS, the operating frequency is suitable for 100MHz. If it exceeds 100MHz, the power will be greatly reduced and the waveform will be distorted. By using overclocking technology, the existing DDS can work at 115 MHz. Under undistorted conditions, the DDS provides a radio frequency signal power of 29.4 dBm and 58% diffraction efficiency, which meet the requirements of power and frequency stability in the cold atomic fountain experiment.
机译:冷原子喷泉实验要求冷却光频移。该实验需要将冷却光的激光频率移至115MHz。为了满足此要求,选择DDS作为AOM的驱动源。对于现有的AD9852芯片,作为DDS的核心芯片,工作频率适合100MHz。如果超过100MHz,功率将大大降低,波形将失真。通过使用超频技术,现有的DDS可以在115 MHz下工作。在不失真的条件下,DDS提供29.4 dBm的射频信号功率和58%的衍射效率,满足冷原子喷泉实验中功率和频率稳定性的要求。

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