N BK7 2200nm Optical Aspheric Lens ROHS Laser Cutting Machine Lens

Optical glass N-BK7 350nm to 2200nm CNC Polished High-Precision Aspheric Lenses

MAP OPTICS' Precision Aspheric Lenses are manufactured using a computer numerical control (CNC) process. By using CNC machines to grind and polish each lens (as opposed to molding), it becomes possible to produce large-diameter (≥10 mm) aspheric lenses that still provide near-diffraction-limited performance. For example, 15 mm diameter, CNC-polished aspheric lenses typically provide 20X to 50X less wavefront error than molded lenses.

These aspheric lenses are optimized for focusing light incident on the aspheric side of the lens with minimal spherical aberration, although they can also be used for collimation when light is incident on the plano side. These Ø10 mm - Ø100 mm lenses are available with NAs ranging from 0.23 to 0.62. The low-NA (<0.3) options are well suited for applications that require a specific beam shape to be maintained, while the high-NA (>0.4) options provide high light-gathering ability (low f/#) while still minimizing spherical aberration.

The lenses are available uncoated or with both sides having a broadband AR coating that provides <0.5% average reflectance (per surface) in the 350 - 700 nm, 650 - 1050 nm, or 1050 - 1700 nm range. They are manufactured from either S-LAH64 or N-BK7. Both substrates offer high transmission from the visible through the NIR (see the Info Icons below for transmission data). However, since S-LAH64 has a higher index of refraction than N-BK7, it is commonly used to fabricate high-NA, short-focal-length lenses.

Map Optical offers non-coated and coated anti-reflection lenses with aspheric surfaces.
Antireflection membrane options include IR1, NIR2.
Zinc selenide based sheets are suitable for infrared applications.
Aspheric lens can well correct spherical aberration and chromatic aberration, and it is often used in barcode scanning, laser collimation, optical imaging and other fields.
Aspheric lenses are designed with a single element, which helps to minimize the number of lenses in multi-lens optical fittings.

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