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480 nm激光的稳频对于实现铷原子从基态双光子相干激发到里德堡态必不可少。基于梯形构型下的电磁诱导透明现象,一种新的480 nm激光器稳频技术采用偏振谱稳频的780 nm激光作为探测光而480 nm激光则作为耦合光,在外加偏置磁场作用下产生的双光子双色原子气体激光锁频(DAVLL)谱,将该谱信号通过比例-积分-微分电路后反馈回480 nm激光器即可实现稳频。在频率锁定后,480 nm激光器和780 nm激光器长时间稳频的总线宽为1 MHz左右。
The frequency stabilization of 480 nm laser is essential for the coherent excitation of Rb atoms from the ground state to the Rydberg states. Based on the electromagnetically induced transparency phenomenon in trapezoidal configuration, a new stabilization technique of 480 nm laser uses a 780 nm laser with stable polarization spectrum as detection light and a 480 nm laser as coupling light, which is generated under the action of an applied bias magnetic field Of the two-photon two-color atomic gas laser lock-in (DAVLL) spectrum, the spectrum signal through the proportional-integral-differential circuit back to the 480 nm laser to achieve frequency stabilization. After frequency locking, the 480-nm laser and the 780-nm laser have a bandwidth of around 1 MHz for long-term frequency stabilization.