The LA0309-E is a Plano-Convex lens with a diameter of 12.7 mm, manufactured by Thorlabs. This lens is designed for use with wavelengths of 4000 nm and is made from Barium Fluoride (BaF2), a material with a high transparency in the infrared region. The lens has an effective focal length (EFL) of 15 mm and a thickness that varies from 2 µm at the edge to 6.3 µm at the center.
The lens features a Spherical shape with a radius of curvature of 6.9 mm for the curved face. The other face is flat, making it suitable for use in a variety of optical systems. The lens is coated with Thorlabs' EBAF2ARC2000-5000 coating on both the front and back surfaces, enhancing its transmission in the 2-5 µm range.
The item data indicates that this lens is in stock, and the vendor's website provides further information and specifications. This lens is a great choice for applications that require a high-quality, infrared-transparent lens with a long focal length and a small form factor.