Hollow Retroreflector, UVFS, Ø1.8 in Clear Aperture, Protected UV-Enhanced Aluminum Coating 250 nm - 600 nm, SM1 Threaded Mount — HR218-UVAL

Hollow Retroreflector — Model HR218-UVAL

UVFS hollow retroreflector, clear aperture Ø1.8 inch, operating wavelength 250 nm-600 nm, protected UV-enhanced aluminum 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.

LBTEK hollow retroreflectors are coated with a protective UV-enhanced aluminum film, offering high reflectivity in the ultraviolet band (Ravg>90%@250 nm-600 nm), making them suitable for UV optical path retroreflection and interferometry. This series provides three standard sizes: half-inch, 1-inch, and 2-inch, with corresponding effective clear apertures of Ø0.60 inches, Ø0.90 inches, and Ø1.80 inches respectively, meeting the assembly requirements of different beam diameters and system spaces. Among them, the half-inch and 1-inch versions are paired with SM05 threaded mounts, while the 2-inch version uses an SM1 threaded mount, enabling direct compatibility with standard optical mounting accessories such as internally threaded optical mounts and coaxial mounting plates of the same specifications. This series of hollow retroreflectors adopts a mirror splicing process. When the beam directly hits the splicing area, scattering or light leakage may occur. Please ensure proper laser protection during use.

Key Features

• Operating Wavelength: 250 nm-600 nm
• Coating: UVAL: Ravg>90%@250 nm-600 nm [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
• UV optical path retroreflection
• UV interferometry