66-329 20 mm Dia. L-BAL35 Precision Aspheric Lens; EFL=15mm; NA=0.66 BBAR 600-1050nm

The 66-329 is a high-precision aspheric lens offered by Edmund Optics, featuring a 20 mm diameter and a numerical aperture of 0.66. This lens is designed for use in the near-infrared (NIR) region, specifically at a wavelength of 587.6 nm.

The lens is made from L-BAL35, a material from Ohara, which is known for its excellent optical properties. The lens's geometry includes an inner radius of 0 mm, an outer radius of 0 mm, and a thickness at the edge of 3.05 mm. The effective focal length (EFL) is 15 mm, and the back focal length (BFL) is 9.16 mm.

The lens's shape is aspheric, which helps to reduce spherical aberration and improve optical performance. The k1 value of -0.624987 further enhances the lens's ability to focus light accurately. The lens's thickness at the center is 9.6 mm.

The lens is coated with BBAR 600-1050, a broadband anti-reflection coating that enhances transmission in the 600-1050 nm range. This coating is applied to both the front and back surfaces of the lens, reducing reflections and increasing the amount of light that passes through the lens.

According to the vendor's website, this item is currently in stock, making it readily available for immediate use. The item's catalog number is 66-329, and it can be found on the Edmund Optics website at https://www.edmundoptics.com/p/20mm-dia-066-numerical-aperture-nir-coated-aspheric-lens/20847/.