功能

• With a simple shape, collimated laser light can be spread.
• It can be used in combination with a convex lens to increase the beam diameter or the illumination area.
• A lens made by BK7 for the visible to near-infrared range.
• Three types of lenses with anti-reflection film are available in the visible, near-infrared and infrared ranges.
• It can be selected according to your specifications from a wide range of variations, subdivided by outer diameter size and focal length.
• * The concave lens cannot collect light or tie a real image by itself.
• * Use in combination with convex lenses.
• * Spherical flat concave lenses have chromatic aberration, and the focal length depends on the wavelength.
• * Flat concave lenses allow light to enter.
• * Allow parallel light to enter from the concave side.
• * Doing the reverse operation will cause spherical aberration to increase, which may result in poor optical performance of the optical system.