Hollow Retroreflector, UVFS, Ø1.8 in Clear Aperture, Protected Silver Coating 450 nm - 20.0 μm, SM1 Threaded Mount — HR218-AG

Hollow Retroreflector — Model HR218-AG

UVFS hollow retroreflector, clear aperture Ø1.8 inch, operating wavelength 450 nm-20 μm, protected silver coating, beam deflection angle <20 arcsec, SM1 threaded mount.

Overview

LBTEK Hollow Retroreflector (Corner Cube Reflector) consists of three mutually perpendicular mirrors, which can reflect an incident beam back parallel to the incident direction (returning along the original path when aligned with the center of the hollow retroreflector), achieving stable retroreflection without precise alignment. This series of products uses fused silica as the substrate, featuring high retroreflection accuracy, excellent surface figure precision, and good thermal stability. Equipped with a protective metal coating, it is suitable for broadband retroreflection and interferometric measurements in the ultraviolet, visible, and infrared ranges. In addition to standard products, LBTEK also offers customization services for retroreflection accuracy, special wavelength coatings, dimensions, or mounting interfaces. The hollow design allows the optical path to travel in air, effectively avoiding material absorption, refractive-index deviation, and chromatic aberration inherent in solid glass prisms.

The LBTEK hollow retroreflector is coated with a protected silver film, offering high reflectivity in the visible to infrared range (Ravg>96%@450 nm-2 μm, Ravg>97.5%@2 μm-20 μm), making it suitable for beam retroreflection and interferometry in the visible to infrared spectrum. This series is available in three standard sizes: half-inch, 1-inch, and 2-inch, with corresponding clear apertures of Ø0.60 inches, Ø0.90 inches, and Ø1.80 inches, respectively, to accommodate various beam diameters and system space requirements. Among them, the half-inch and 1-inch versions are paired with an SM05 threaded mount, while the 2-inch version is paired with an SM1 threaded mount, allowing direct adaptation to internally threaded optical mounts of the same specification. This series of hollow retroreflectors uses a mirror assembly process. When the beam directly hits the mirror assembly junction, scattering or light leakage may occur. Please ensure proper laser protection during use.

Key Features

• Operating Wavelength: 450 nm-20 μm
• Coating: AG: Ravg>96%@450 nm-2 μm, Ravg>97.5%@2 μm-20 μm [a]
• Beam deflection angle: <20 arcsec
• Clear Aperture: Ø1.8 inch
• Base material: UVFS
• Base thickness: 5 mm
• Surface Flatness (@633 nm): <2λ (single piece<λ/8)
• Surface finish (scratches/pitting): 60/40
• Thread size: SM1
• Operating Temperature: -20℃~85℃

Applications

• Precision optical metrology
• Laser technology
• Aerospace
• Beam retroreflection in the visible to infrared spectrum
• Interferometry in the visible to infrared spectrum