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Double Concave Spherical Lens
Double concave spherical lens is an excellent choice, if the absolute conjugate ratio of the object and image is close to 1:1 when focusing the input beam, Its output light appears to diverge from the virtual image of the lens surface, and the distance from this virtual point to the lens is called the focal length. Similar to the piano-concave lens, the double concave spherical lens has a negative focal length, which allows the collimated incident light to diverge. The two sides of a biconcave lens have equal curvature radii. It is commonly used to expand light rays or increase focal length in existing systems such as beam expanders and projection systems.
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在聚焦输入光束时，如果物和像的绝对共轭比接近 1:1，则双凹透镜是绝佳之选。输出光线看起来是从透镜物面的虚像发散出来的。从该虚点到透镜的距离被称为焦距。与平凹透镜类似，双凹透镜的焦距为负，从而可使准直的入射光发散。双凹透镜的透镜两侧具有相等的曲率半径。其通常用于在现有系统（例如扩束器和投影系统）中扩展光线或增加焦距。
通用参数：
| 材料 | K9,JGS1或其他材料 | 中心偏 | <3′ |
| 尺寸公差 | +0/-0.2mm | 光洁度 | 60/40 |
| 焦距公差 | ±2% | 设计波长（nm） | 546.1nm |
| 通光孔径 | >90% | 倒角 | 保护性 |
| 面形 | N<3(0.5)@633nm | 镀膜 | 根据客户要求 |
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