- Substrate Material: UVFS
- Operating Wavelength: 2.0 μm-20.0 μm
- Silicon Dioxide Protective Layer
- Beam Focusing, Collimation, Collection and Imaging
LBTEK offers gold-coated concave mirrors with off-axis holes. Two gold-coated concave mirrors with the same focal length can form a cavity. At least one of the mirrors has a through-hole (central hole or off-axis hole), allowing light to enter and exit through the hole on the concave mirror, undergoing multiple reflections within the cavity before returning to its entry point, which can be used as a Herriot gas absorption cell. LBTEK mirrors with through-holes feature a Ø3.0 mm aperture on the backside with a 60° chamfer. LBTEK gold-coated concave mirrors use UV-grade fused silica as the substrate material, providing higher thermal stability. The surface is coated with a silica protective layer to prevent direct contact between the metal film and air, avoiding oxidation of the metal film that could affect optical performance.

LBTEK mirror mounted in mirror holder AMM-1B