Product Description

l Optical Material: N-BK7

l Operating Wavelength: 350 nm-2.0 μm (uncoated)

l Application: Imaging, beam expansion or reduction

     Double-concave lenses feature two concave surfaces with equal radii of curvature and provide a negative focal length. They are typically used for beam collimation, focal length adjustment, or image reduction/expansion. N-BK7 is one of the most commonly used optical materials, well-suited for applications in the visible and near-infrared spectral ranges. Tuniu manufactures a wide range of double-concave lenses from N-BK7 for general-purpose use. In addition, Tuniu also offers double-concave lenses made from N-SF11. With its lower Abbe number, N-SF11 is often used to produce lenses with shorter focal lengths. Tuniu provides uncoated double-concave lenses as well as AR-coated versions optimized for three wavelength ranges: 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are precisely manufactured under strict quality control, ensuring that Tuniu delivers high-quality products at competitive prices.

Attributes

Double-Concave Lens, N-BK7, Uncoated: 350 nm-2.0 μm

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, Uncoated: 350 nm-2.0 μm, Unmounted

     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 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.