激光二极管抽运铷原子脉塞的实验研究
Experimental Study of the Laser Diode Pumped Rubidium Maser
摘要：
本文报道了以激光二极管为泵浦源的$^{87}$ Rb脉泽的自激振荡工作。微波激射器使用TE $_{021}$腔体，腔体包围含有原子和11托N $_{2}$作为缓冲气体的单元。光泵浦是通过使用商业激光二极管频率锁定在外部铷池的线性吸收线上来实现的。通过改变脉塞注入电流来调制脉塞频率，从而展宽激光频谱，使脉塞输出功率达到最大。给出了不同调制波形和频率下脉塞的输出功率。我们发现，由调制引起的寄生边带可以被最小化。最后，激光和脉泽频率之间的线性关系。我们发现激光对脉泽频率的相对拉动约为$4.6 \times 10^{-3}$。
英文摘要：
We report the operation of a $^{87}$Rb maser in the self-oscillating mode, using a laser diode as the optical pumping source. The maser uses a TE$_{021}$ cavity surrounding a cell containing the atoms and 11 Torr of N$_{2}$ as the buffer gas. The optical pumping is accomplished by using a commercial laser diode frequency-locked on the linear absorption line of an external rubidium cell. The maser output power is maximized when the laser spectrum is spread by modulating its frequency through the variation of its injection current. The maser output power is also presented for various modulation waveforms and frequencies. We find that the spurious sidebands induced by the modulation can be minimized. Finally, the linear dependence between the laser and maser frequencies is shown. We find that the relative maser frequency pulling from the laser is about $4.6 \times 10^{-3}$.
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