Primary experimental results of the dichroic filters on FIR laser interferometer
ZHENG Ling,ZHOU Yan,DENG Zhong-chao,YI Jiang,LI Yong-gao,LI Lian-cai (Southwestern Institute of Physics,Chengdu 610041)
One kind of dichroic filters for protecting the detectors of FIR laser interferometer on HL-2A tokamak is introduced. The geometry of dichroic filters was optimized. The dichroic filters were used on HL-2A FIR laser interferometer system for the first time. The experimental results show that the dichroic filters can effectively isolate the interference from ECRH and make the HCN laser signals keep high transmittance.