This is a Plano-Concave lens, a type of spherical lens, sourced from Qioptiq Photonics. The lens has a base shape of a circle and a diameter of 22.4 mm. The center thickness of the lens is 1.5 mm, and it has an effective focal length (EFL) of -50 mm, making it a negative lens. The lens is designed to work with a wavelength of 588 nm.
The lens is made of N-BK7, a type of glass commonly used in optical applications due to its excellent optical properties. The lens's inner and outer radii are both zero, indicating a plano-concave shape.
The lens is coated with qio bbar arb2visnbk7 on both the front and back surfaces. This coating is designed to enhance the lens's performance in the visible light spectrum (450-700 nm).
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