This is the G340761000, a high-power laser mirror from Qioptiq Photonics, designed with a 12.7 mm diameter and a thickness of 5mm. The mirror is made from UVFS material, specifically identified as UVFS MAL-1965, which is known for its durability and precision.
The mirror's coating is a key feature, specifically the front coating of Qio HRL DLHS-NIR 45. This coating is designed to optimally reflect light at a wavelength of 1064nm, making it ideal for use in high-power laser applications. The mirror's shape is that of a thin lens, further enhancing its optical properties.
For more detailed information, you can refer to the vendor's website at https://www.qioptiq-shop.com/en/Precision-Optics/Mirrors/Dielectric-Mirrors/Dielectric-Coated-Plane-Mirrors-DLHS-NIR-1064-nm.html. Here, you can find the mirror's current availability and other related products.