The 850nm bandpass filter is used in NIR imaging system to eliminate the influence of surrounding background light, including the visible and NIR light. This filter is to increase the signal/noise ratio of the imager.
The applications include video surveillance, visual telephone, visual doorbell, digital telescope and other imaging systems.
Specifications:
SubstrateFloat glass
Size2×2mm~81×81mm
Thickness0.4, 0.5, 0.7, 1.1mm
Surface Quality40/20, 60/40
Spectrum Characteristic400~800nm T<2%
835±10nm, 895±10nm T=50%
830870nm Tave>85% Tmin>80%
9501100 nm Tave<2%
(The final detailed specifications are customized or suggested by Lenoptec. )
All Optical filters include:
Acrylic Filter
Dichroic Filter
Beam Splitter
Reflective Coating
Interference Filter
Waterproof and dustproof coating
AR coating
UVIR Blocker
IR Cutoff Filter
Angle of incidence---------0°
Substrate---------------------BK7, Float glass, B270, Borofloat33
Size-----------------------------Customized
Application--------------------For image sensor that only requires NIR light.
(The final detailed specifications are customized or suggested by Lenoptec. )
High visible light reflective mirror, also called Cold mirror, is designed to reflect the visible light at the reflectance of at least 90%, while pass the IR light at the transmission of at least 90%.
Commonly applied to biometric devices that the sensor only requires NIR light to form the image.
All Optical filters include:
Acrylic Filter
Dichroic Filter
Beam Splitter
Reflective Coating
Interference Filter
Waterproof and dustproof coating
AR coating
UV-IR Blocker
IR Cut-off Filter
Plano-convex lens, aslo called positive lens, is used to converge incident light to a spot on the axis, at a certain distance behind the lens, which is knowed as focal length. It can form both real images and virtual images(for magnifier) on the two sides. The materials to make plano-convex lens can be BK7, Fused Cilica, sapphire and CaF2 etc., for different applications.This model are commonly applied in many devices including telescopes, collimators, magnifiers,optical transceivers, condensers and other optical display or imaging optical systems. AR/NIR or other coatings are available according to the applications.
Material-------------------Fused cilica, BK7 Grade A or equivalent optical glasses
Design Wavalength------546.1nm
Diameter Tolerance------í+0.1mm, í+0.15mm for Dia.í¦75mm
Paraxial Focus Length----í+2%
Centration----------------<3 arc minutes
Clear Aperture------------>85%
Surface Figure------------ª-/4 @632.8nm
Surface Quality-----------60-40 scratch and dig
Coatings-------------------Antireflection coatings or NIR coatings
Bevel-----------------------A slight protective bevel, such as 0.25mmí-45íp
(For different applications, there are various choices in the specifications, which must be determined according to usersí» specific requirements.)
Semiconductor Laser Filter, applied to blue and green semiconductor laser, to cut off the 808nm and 1064nm laser, while to pass the blue and green laser.
Substrate---------D263T/B270/BK7 or customized
Thickness---------0.3~1.1mm
Surface Quality---40/20, 60/40
Square Size------(3~15)×(3~15)mm
Round Size-------φ3~20mm
(The final detailed specifications are customized or suggested by Lenoptec.)
All Optical filters-Coatings include:
Acrylic Filters
Dichroic Filters
Beam Splitters
Reflective Coatings
Interference Filter
Waterproof and dustproof coatings
AR coatings
UV-IR Blockers
IR Cut-off Filters
Achromatic lens is designed to limit the effects of chromatic and spherical abberation. It is corrected to bring two wavelengths(typically red and blue) into focus in the same plane. Achromatic lenses can be doublets or triplets, with two or three individual glasses cemented together.
Material--------------------BK7 Grade A or equivalent optical glasses
Design Wavalength-------480-650nm
Diameter Tolerance-------í+0.1mm, í+0.15mm for Dia.í¦75mm
Paraxial Focus Length-----í+2% @546.1nm
Centration-----------------<3 arc minutes
Clear Aperture------------->80%
Surface Figure-------------ª-/4 @632.8nm
Surface Quality------------60-40 scratches and dig
Coatings-------------------Antireflection coatings or NIR coatings
Bevel-----------------------A slight protective bevel
(For different applications, there are various choices in the specifications, which must be determined according to users specific requirements.)
OST Photonics Cylindrical Lenses
Cylindrical lenses are utilized for astigmatism correction in the eye and rangefinders, inducing astigmatism by elongating a point of light into a line. They find extensive application in barcode scanning, projection optics systems, laser measurement systems, and holography. Ost Photonics offers cylindrical concave lens in plano-concave or plano-convex configurations.
Basics about Cylindrical Lenses
LENSES MATERIALS ILLUSTRATION PROPERTIES AND APPLICATIONS
CYLINDRICAL LENS BK7/ Fused Silica/CaF2 /other optical glass Used to provide focusing power in one section only. For illumination or detection of light from line sources. Also used for the anamorphic compression of beams and images.
Specifications of Cylindrical Lenses
Material Schott N-BK7, CDGM H-K9L, Fused silica, CaF2, Sapphire
Design wavelength 546.07nm
Design index (bk7) 1.51680 for BK7, 1.45846 for Fused Silica
Diameter tolerance +0.0, 0.15mm +0.0, 0.05mm
Paraxial focal length �±2% �±0.5%
Centration
Clear aperture 80% 90%
Surface quality 60-40 scratch and dig 10-5 Scratch and dig
Surface irregularity
Protective bevel 0.25 + 0.25, -0.0mm 0.2 �± 0.1mm
Coating Uncoating, AR or Single layer MgF2 coating upon request
What Is a Cylindrical Lens Used For?
Cylindrical lenses are specialized optical components used primarily to correct astigmatism, a common refractive error in the eye. Unlike spherical lenses, which have the same curvature in all directions, cylindrical lenses have curvature in only one direction. This unique property allows them to focus light into a line rather than a point, making them ideal for applications requiring precise control over light direction and focus. OST Photonics, a leader in cylindrical optics, offers high-quality cylindrical lenses designed to meet various optical needs.
