Product Description
The focal length of a plano-concave lens is negative, and the parallel beams will diverge when they are incident on the plano-concave lens, so the outgoing rays can't converge into one point, but seem to diverge from a virtual image point located in the object space. When the absolute conjugate ratio is greater than 5:1 or less than 1:5, the plano-concave lens is the best negative lens to reduce spherical aberration, coma and distortion. The concave surface of plano-concave lens should face the object direction, but it should be applied to high-energy laser system, so it should be placed in the opposite direction to reduce the possibility of focusing the remaining reflected light on the surface.
Various specifications of K9 plano-concave lenses are available from stock, and Zemax data of a full range of products are provided for download.
KPA-301 H-K9 Plano-Concave Lens Single-Layer MgF2 Antireflection Film
The focal length of a plano-concave lens is negative, and the parallel beams will diverge when they are incident on the plano-concave lens, so the outgoing rays can't converge into one point, but seem to diverge from a virtual image point located in the object space. When the absolute conjugate ratio is greater than 5:1 or less than 1:5, the plano-concave lens is the best negative lens to reduce spherical aberration, coma and distortion. The concave surface of plano-concave lens should face the object direction, but it should be applied to high-energy laser system, so it should be placed in the opposite direction to reduce the possibility of focusing the remaining reflected light on the surface. Various specifications of H-K9 plano-concave lenses are available from stock, and Zemax data of a full range of products are provided for download. This series of lenses can obtain a surface reflectivity as low as 2.5% in the range of 400-700nm by plating a single layer of MgF2 antireflection film. The single-layer MgF2 antireflection film of this series of products has no requirement for damage threshold.
KPA-328 H-K9 Plano-Concave Lens Single-Layer MgF2 Film With Metal Frame.
This series of plano-concave lenses are made of H-K9L glass and coated with a single layer of magnesium fluoride antireflection film. The lens is pre-installed in the frame with external thread of 1.035 "-40 (SM1) with external diameter of 30mm, which can be compatible with SM1 threaded frame or 30 mm coaxial lens barrel series. The lens frame is marked with the lens type, focal length and coating range of antireflection film. The focal length of the plano-concave lens is negative, and the parallel light beam diverges after entering the plano-concave lens, so the outgoing light beam cannot converge into one point, but seems to diverge from a virtual image point located in the object space. At this time, the concave surface of the lens should face the object to minimize spherical aberration, but it should be placed in reverse when applied to high-energy laser system to reduce the possibility of focusing the residual reflected light on the surface.
Lens coating: single-layer MgF2
Mounting thread: 1.035 "-40 (SM1) light-transmitting
Aperture: φ23.
KPA-328 H-K9 Plano-Concave Lens Single-Layer MgF2 Antireflection Film With Metal Frame
The lens is pre-installed in a metal frame with an outer diameter of φ30mm, and there is no external thread;
The lens eccentricity has been adjusted and fixed with glue, and the eccentricity C is ≤ 0.04 mm;
Outer frame diameter φ 30 mm;
The thickness of the lens frame is 10mm, 15mm and 20mm to choose from.
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