기능

• Cylindrical flat concave lenses (cylindrical flat concave lenses) have the curvature of a concave lens in the vertical direction and no curvature in the horizontal direction.
• It is used in combination with cylindrical plano-convex lenses to shape elliptical beams of semiconductor lasers into circular beams.
• A lens made by BK7 for the visible to near-infrared range.
• Three types of lenses with anti-reflection films are also available in the visible, near-infrared and infrared ranges.
• By using a cylindrical lens in the optical system, the beam shape and the aspect ratio of the illumination light can be deformed.
• A cylindrical lens holder (CHA) is available for fixing cylindrical lenses.
• * Cylindrical flat concave lenses have chromatic aberration, and the focal length depends on the wavelength.
• Cylindrical flat concave lenses allow light to enter in certain directions.
• * Be sure to allow parallel light to enter from the concave side.
• * Doing the reverse operation will cause the spherical aberration to increase and may result in poor optical performance.
• * The transmittance of the uncoated product is about 90% due to the loss caused by the reflection of the front and back of the lens.