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研究了激光二极管抽运的可调频差的双频固体激光器,激光增益介质为2mm厚的1at%掺杂Nd:YAG薄片.对谐振腔产生稳定双频激光的条件作了分析,用琼斯矩阵计算了谐振腔内各处电场矢量的偏振态,证明了双频激光两个电场矢量偏振态之间总是正交的.两个偏振激光频率间隔由改变λ/4波片快轴之间的夹角实现调谐.实验中使用腔内标准具实现单频运转,然后插入双λ/4波片使单纵模激光频率分裂,实现了激光器的双频输出.实验中得到双频激光稳定运转时频差的上限约为1.3GHz;由于强模竞争现象的存在,实验中所观察到的频差下限为50MHz.100MHz拍频时得到的双频激光输出功率为85mW.
The tunable frequency difference of dual frequency solid state laser with laser diode pumping is studied, the laser gain medium is 1at% doped Nd: YAG thin film with thickness of 2mm.The condition of producing stable dual frequency laser in cavity is analyzed and calculated by Jones matrix It is proved that the polarization states of two electric field vectors of the two-frequency laser are always orthogonal, and the interval between the two polarized laser frequencies is changed by changing the difference between the fast axis of the λ / 4 wave plate Angle to achieve the tuning.In the experiment, the use of intracavity etalon to achieve single-frequency operation, and then insert double λ / 4 wave plate to single-longitudinal mode laser frequency splitting to achieve the dual-frequency laser output.In the experiment, dual-frequency laser stable operating time-frequency The upper limit of the difference is about 1.3GHz. Due to the strong mode competition, the lower limit of frequency deviation observed in the experiment is 50MHz. The dual-frequency laser output power obtained at 100MHz beat frequency is 85mW.