A pentaprism is a precision optic with two reflecting faces at 45° to each other and two refracting faces perpendicular to the entrance and exit beams, providing 90° deflection in the focal plane. Precision grinding of optical-grade glass creates a special geometry with five polished faces. It deflects incident light by a constant angle, maintaining a fixed input-output angle regardless of rotation about the optical axis. Highly reflective coatings on two faces provide efficient beam turning, while accurate transmitting surfaces preserve the wavefront. Substrates cover ultraviolet to infrared, with physical and chemical stability under vibration and temperature changes. Changchun Longze Precision Optics Co., Ltd. supplies custom precision pentaprisms in N-BK7 and UV fused silica for ultraviolet, visible, and near-infrared applications.
Industrial precision measurement: laser collimators combine laser focusing and pentaprisms to establish stable reference axes for accurate long-distance straightness measurement. Large-equipment installation and calibration systems use their rotation-invariant properties to transfer optical references between stations. Coordinate-measuring machines integrate prism assemblies for spatial-angle calibration. Optical instrument systems: military periscopes combine high-quality lenses and pentaprisms for concealed observation and erect images. Automatic leveling modules in surveying instruments use prisms to compensate tilt errors. Star-tracker calibration generates simulated reference starlight at constant angular separations. Laser processing: multi-station marking systems rotate pentaprisms to distribute beams spatially by time division. Curved-surface processing equipment integrates prism groups to maintain constant-angle beam incidence relative to complex surface normals. Laser welding heads use prism properties to maintain stable energy delivery at welds. Inspection and positioning: tunnel guidance uses pentaprisms to establish excavation-axis optical references. Ship shaft-alignment instruments synchronously deflect multi-angle measurement paths with prism groups. Drone ship-landing guidance uses miniature prisms for stable positioning spots. Research and special uses: space gravitational-wave detection projects use pentaprisms for fine intersatellite laser pointing. Particle-accelerator beam diagnostics insert monitoring paths without disturbance. High-altitude atmospheric lidar uses weather-resistant prisms for stable beam steering in scanners. Medical integration: dental three-dimensional scanners use miniature pentaprisms for compact multi-angle imaging paths. Surgical navigation systems maintain the instrument coordinate-system orientation reference through prism properties. Ophthalmic diagnostic equipment integrates prisms to correct detection-beam paths.
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Changchun Longze Precision Optical Instrument Co., Ltd., established in 2012, specializes in the processing and manufacturing of precision optical components. Its products are applied in fields such as optical imaging instruments, optical testing instruments, medical instruments, and laser instruments. With excellent quality and exquisite craftsmanship, it has won wide acclaim from customers at home and abroad. Adhering to the concept of 'fine products, dedicated to quality' and strictly following the ISO9001 quality certification system, the company possesses advanced inspection equipment such as ZYGO interferometers, Agilent Cary 5000 spectrophotometers, etc., ensuring each product meets specifications. Its products are widely exported to developed markets like the US, EU, and Japan. Main products include precision optical lenses, optical domes, filters, mirrors, optical windows, prisms, assembly, and coatings, used in various commercial, medical, scientific research, imaging systems, and laser systems.