用于低频压缩光产生的振动不敏感模式清洁器

Vibration-insensitive Mode Cleaner for Generation of Low-frequency Squeezed Light

利用有限元分析技术定量仿真了重力场中双横梁支撑式三角形模式清洁器形变引起的腔长变化,得到在横梁宽度160 mm、偏移97.5 mm为振动最不敏感的横梁参数,模式清洁器在重力加速度中腔长变化率的最小斜率为0.67×10^-10 mm^-1;并通过模态分析与随机振动分析,确定了基模的振动频率为5.9 kHz,获得了适用于千赫兹以下低频压缩光产生的模式清洁器工作频段.

The finite element analysis is used to quantitatively simulate the cavity length change caused by the deformation of the triangular mode cleaner supported by two beams in the gravitational field.The optimal parameters of vibration-insensitive support structure are determined,which are the beam’s width of 160 mm and beam’s displacement of 97.5 mm.The minimum slope of the change rate of the cavity length of the cleaner is 0.67×10^-10 mm^-1 in the gravitational field.Through modal analysis and random vibration analysis,the vibration frequency of the fundamental mode is determined to be 5.9 kHz,and we get the working frequency range of the mode cleaner suitable for the generation of the squeezed light in low-frequency band.