LBTEK-Your Trusted Partner For Optoelectronic Experiments!

Product Description

Optical Material: N-SF11
Operating Wavelength: 420 nm-2.3 μm (uncoated)
Application: Imaging, beam expansion or reduction

LBTEK Double-Concave Lenses feature two concave surfaces with equal radii of curvature, providing a negative focal length. They are commonly used for beam collimation, focal length adjustment, and image reduction or magnification. To meet different application requirements, LBTEK offers double-concave lenses made from both N-SF11 and N-BK7 glass. N-SF11 lenses, with a lower Abbe number, exhibit higher dispersion than N-BK7, making them ideal for shorter focal length designs and for use in harsh environments such as acidic or alkaline conditions. N-BK7 lenses, by contrast, are among the most widely used materials for high-quality optics, offering excellent transmission in the visible and near-infrared regions and making them suitable for a broad range of general-purpose applications. LBTEK provides both uncoated double-concave lenses and AR-coated versions optimized for 400–700 nm, 700–1100 nm, and 1100–1650 nm. All lenses are manufactured with precision and undergo strict quality control, ensuring that LBTEK delivers high-performance optical components at competitive prices.

Attribute

Optical component materialN-SF11

Operating Wavelength420 nm-2300 nm

Focal length tolerance±1%

Surface finish (scratches/pits)40/20

Curved Aperture3

Local surface irregularity0.5

Eccentricity≤3 arcmin

Double-concave lens, N-SF11, AR coating: 420 nm-2.3 μm

Substrate Material: N-SF11
Operating Wavelength: 420 nm-2.3 μm (uncoated)
Application: Imaging, beam expansion or reduction
Pre-installed mechanical housing

LBTEK double-concave lenses have a negative focal length and are commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK come pre-installed with standard lens sleeves or lens mounting adapters. The surfaces of these mechanical components.

The LBTEK lens housing surface is engraved with product model and other information.

	Product Model	Diameter	Focal length	Unit Price	Compare	Lead Time
	MBCC30605	25.4 mm	-25.0 mm	$42.23		6 weeks

Double-concave lens, N-SF11, AR coating: 420 nm-2.3 μm, unmounted

Substrate Material: N-SF11
Operating Wavelength: 420 nm-2300 nm
Application: Imaging, Beam Expansion or Reduction

The LBTEK double-concave lens has a negative focal length and is commonly used in applications such as imaging or beam collimation. Since N-SF11 has a lower Abbe number, LBTEK chooses to use RoHS-certified N-SF11 to manufacture lenses with various smaller focal lengths. Additionally, N-SF11 lenses are more suitable for particularly harsh (acidic or alkaline) environments. All circular lenses from LBTEK can be mounted in LBTEK standard lens sleeves, fixed lens holders, and various coaxial mounting plates. Customers can select the optimal mounting method based on different application scenarios.

LBTEK lens not installed, suitable for building compact systems

	Product Model	Diameter	Focal length	Unit Price	Compare	Lead Time
	BCC30605	25.4 mm	-25.0 mm	$32.29		6 weeks

Double-Concave Lens, N-SF11, Uncoated: 420 nm - 2.3 μm