This is the PLCC-25.4-25.8-UV, a Plano-Concave Spherical Lens with a diameter of 25.4 mm, sourced from CVI Laser Optics. The lens is designed for use with a wavelength of 588 nm and is made from UVFS material, specifically identified as UVFS MAL-1965.
The lens has a center thickness of 3 mm and an effective focal length (EFL) of -50 mm, indicating its concave shape. The inner radius is 0 mm, and the outer radius is also 0 mm, further emphasizing its concave nature. The lens is uncoated, which may affect its performance in certain applications, but it can be advantageous in others, such as when minimal reflection is required.
The lens is in stock and available for immediate purchase. For more detailed specifications, please refer to the vendor's catalog, which can be found at https://www.idexot.com/media/wysiwyg/cms-pages/pdf/2-Spherical_Lenses.pdf.