SLB-20B-30N 20.0 mm Dia. x -29.7 mm FL; Double-Concave Lens Uncoated

The SLB-20B-30N is a high-quality double-concave lens, uncoated, with a diameter of 20.0 mm and a focal length of -29.7 mm. This lens is sourced from OptoSigma, a renowned vendor known for their precision optical elements.

The lens is made of n-BK7 Schott, a popular optical glass due to its excellent optical properties and high homogeneity. The base shape of the lens is circular, and it features a spherical geometry with a center thickness of 2.0 mm and an edge thickness of 5.3 mm. The inner and outer radii are both 0, indicating a symmetrical design.

The lens is designed to operate at a wavelength of 546.1 nm, making it suitable for a wide range of applications in the visible light spectrum. The double-concave design, characterized by two concave surfaces, is ideal for use in imaging systems, beam shaping, and other applications where light needs to be focused or diverged.

The lens is uncoated, meaning it does not have any anti-reflective or other surface coatings. This can be advantageous in certain applications where the natural properties of the glass surface are desired, or where cost considerations are a factor. However, it's important to note that uncoated lenses can exhibit higher levels of reflection and may require additional considerations for optimal performance.