Product Description

l Optical Material: N-BK7

l Operating Wavelength: 700 nm-1100 nm (AR Coating)

l Application: Imaging, Beam Expansion

     Tuniu double-concave lenses feature concave surfaces on both sides with equal radii of curvature. With a negative focal length, these lenses are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. Tuniu offers double-concave lenses fabricated from N-BK7, the most widely used optical glass for visible and near-infrared applications. In addition, N-SF11 double-concave lenses are available; with a lower Abbe number, N-SF11 enables shorter focal lengths compared to N-BK7. A variety of coating options are provided, including uncoated, 400–700 nm, 700–1100 nm, and 1100–1650 nm broadband AR coatings, to support diverse application needs. Each lens is precisely manufactured and quality-controlled to ensure that Tuniu delivers high-performance optics at competitive prices.

Attributes

Double-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm

l Pre-installed Mechanical Housing

     The Tuniu double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Tuniu double-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in the visible and near-infrared spectral ranges. All Tuniu circular lenses come pre-installed with standard lens sleeves or lens mounting adapters. These mechanical components are engraved with product model numbers, types, diameters, and focal lengths for easy identification of lens parameters by users.

Double-Concave Lens, N-BK7, AR Coating: 700 nm-1100 nm, Unmounted

     The Tuniu bi-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Tuniu bi-concave lenses are manufactured using N-BK7 glass that complies with RoHS standards. N-BK7 is the most commonly used material for high-quality optical components, primarily applied in visible and near-infrared fields. All circular lenses from Tuniu can be mounted in Tuniu standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can choose the optimal mounting method for different application scenarios.