lens focus

When the distance between Gauss beam waist of object and lens is farther than the lens focus, and the lens focus is minimum;

即当物方高斯光束束腰离透镜的距离l远大于透镜焦距f，f为极小值；

Research on Open Circuit Voltage of Solar Cell Under the Modulation of Lens Focus Position

透镜焦点位置调制太阳电池开路电压的研究

Error of the Non-ideal Thin Convex Lens Focus Measures

非理想薄凸透镜焦距测量的误差

The acoustic lens focus system has many strong points, such as: ease of operation, structure simple, diverse shape and cheap of sound material and widely applied in the clinical medicine.

声透镜聚焦系统由于其操作方便、结构简单、形状多样、折声材料便宜等方面的优点而在临床医学中被广泛应用。

Many ultrasonic treatment systems produced by The Chongqing HIFU Company are acoustic lens focus system.

重庆海扶公司生产的许多超声治疗系统，都采用的是声透镜聚焦系统。

Or when the distance is near to zero, and the Rayleigh distance is farther than the lens focus, the less focalized waist can be obtained.

或l接近于零，瑞利距离Z0远大于透镜焦距时，能够获得较小的聚焦束腰。