Cylindrical Plano-concave Lens (BK7) 20×20mm −40mm Focal Length 750 - 1550nm

CLB-2020-40NIR2

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Cylindrical plano concave lens has a concave curvature in the vertical direction and has no curvature in the horizontal direction. When used in combination with a plano-convex cylindrical lens an elliptical shaped beam can be sharped into a circular beam for use in semiconductor and other laser applications.

Details

◦Plano Concave Cylindrical lenses are available in BK7 for from visible range to infrared wavelength range.
◦BK7 lenses are also available with three types of anti-reflection coatings, visible wavelength range, in the near-infrared range and in the infrared range.
◦Cylindrical lenses are often used in an optical system to change the shape and aspect ratio of the illumination light beam.

More Information

More Information
Name	Cylindrical Plano-concave Lens (BK7) 20×20mm −40mm Focal Length 750 - 1550nm
Weight	0.0060kgs
Standard Coatings Available	No
Guide	Lenses are available in a large selection and in custom sizes and focal lengths. In addition to our standard coating we offer custom anti-reflective coating at specific wavelengths. We offer holders to mount our catalog cylindrical lenses, consult our Sales Division for assistance in your selection (CHA). WEB Reference Catalog Code/W4022
Remark	-
Attention	The cylindrical plano-concave lens has chromatic aberration, the focal length will vary depending on the wavelength. Please check the “wavelength characteristic of the focal length data” on “Technical Data” for the focal lengths of each wavelength. When using a plano-concave cylindrical lens parallel light should incident to the concave side first. There is a possibility that the spherical aberration will increase and optical performance of the system will be degraded if use in reverse. Transmissions losses due to reflection off the front and rear surfaces of the lens can be minimized by coating the surfaces. Consult our Sales Division for anti-reflection coatings suitable for your application.
A x B	20mm x 20mm
Focal length	40mm
Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance	> Average 98.5%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	Circle or ellipse inscribed in a rectangular of 90% of the dimension
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	750 - 1550nm
A×B	20×20mm
Focal length f	−40mm
Edge thickness te	5mm
Center thickness tc	2.4mm
Back focal length fb	−41.6mm
Radius of curvature r	20.76mm

In stock

SKU

CLB-2020-40NIR2

$236.00

Cylindrical Plano-concave Lens (BK7) 20×20mm −40mm Focal Length 750 - 1550nm

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