This is a Low Dispersion Mirror for Femtosecond Laser, specifically designed for use with a 25.4 mm diameter. Manufactured by OptoSigma, a renowned vendor in the optical industry, this mirror is made of N-BK7 Schott, a high-quality glass material known for its excellent optical properties.
The mirror has a thickness of 5mm and features a dielectric coating on the front surface, optimized for an angle of incidence (AOI) of 45 degrees at a wavelength of 800nm. This coating, referred to as 'opt flm2-800 aoi 45', is designed to enhance the mirror's performance in femtosecond laser applications.
The mirror's geometry is that of a thin lens, and it is available from OptoSigma's website, where it is currently listed as in stock. The product's webpage provides more detailed information and specifications.