This is a Plano-Concave Lens from Laser Components, a renowned vendor in the optical industry. The lens, with a diameter of 25.4 mm, is designed for use in systems with a wavelength of 633 nm. The lens's geometry is characterized by its center thickness of 2 mm, a concave radius of -386.3 mm, and a focal length (EFL) of -750 mm, making it suitable for applications requiring negative focal lengths.
The lens is made of N-BK7, a popular glass type in the optical industry, known for its excellent optical properties. This specific lens, however, is uncoated, meaning it does not have any additional layers to enhance its optical performance or protect it from environmental factors.
For more detailed information, please refer to the vendor's datasheet, which can be found at https://www.lasercomponents.com/fileadmin/user_upload/home/Datasheets/lc-optics/substrates/plano_concave_lenses.pdf. The datasheet also indicates the lens's availability and current stock status.