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为提高自由空间通信、遥感、激光雷达等系统的信噪比,研究了铷775.9 nm激光感生色散光学滤波器(LIDOF).通过780 nm线偏振抽运光选择性激发基态原子,使其在激发态子能级间布居不均衡,从而引起激发态的圆二色向性和圆双折射,使与激发态共振的775.9 nm探测光偏振态发生旋转,实现滤波传输.获得的峰值透射率为4%,带宽约为605 MHz,同时,得到了峰值透射率随池温和抽运功率的变化关系.
In order to improve the signal-to-noise ratio (SNR) of systems such as free space communication, remote sensing and lidar, the rubidium 775.9 nm laser inductive dispersion optical filter (LIDOF) was studied.The ground state atoms were selectively excited by 780 nm linearly polarized pumping light, The unbalanced population of the excited states causes circular dichroism and circular birefringence in the excited state, so that the polarization state of the probe light at 775.9 nm which resonates with the excited state is rotated to achieve the filtering transmission. The obtained peak transmittance Is 4%, and the bandwidth is about 605 MHz. Meanwhile, the relationship between the peak transmittance and the cell temperature and pumping power is obtained.