This is a PLCC-25.4-19.6-C, a Plano-Concave Spherical Lens with a 25.4 mm diameter, sourced from CVI Laser Optics. The lens is made of N-BK7 Schott, a popular material in the optical industry due to its excellent optical properties and high damage threshold.
The lens features a concave shape with a radius of curvature of -19.6 mm, and a center thickness of 2 mm. The effective focal length (EFL) is -38 mm, making it suitable for applications that require a diverging lens. The lens is uncoated, which means it does not have any anti-reflective coatings.
This lens is part of the Spherical Lenses category and is intended for use in laser applications. The item data indicates that it is in stock and the vendor's website provides further technical details. The link to the product data sheet is: https://www.idexot.com/media/wysiwyg/cms-pages/pdf/2-Spherical_Lenses.pdf