Ultra-Precision Machining Polishing of Large Diameter

Coligh Optics is a manufacturer of infrared optical components, excelling particularly in large apertures, high precision, and complex structures. We possess full-process customization capabilities spanning optical design, material processing, polishing, grinding, coating, and inspection. We provide customized services for large infrared optical components ranging from 3mm to 1000mm, meeting the demands of scientific research, aerospace, medical, and industrial sectors.

We currently offer precision machining for multiple infrared materials:

• Zinc sulfide
• Zinc selenide
• Silicon
• Calcium fluoride
• Magnesium fluoride
• Sapphire
• Ruby
• Chalcogenide glass
• Fused silica

We can custom-process infrared optical components ranging from 3 to 1000 mm in shape:

• Plane: Optical windows, beam splitters, mirrors
• Spherical: Spherical lenses, spherical mirrors, infrared radomes
• Aspheric: Small aspheric elements, large aspheric elements, off-axis aspheric elements
• Cylindrical lenses, prisms, lenses, wedges, etc.
• Or any other custom shapes such as tubes, irregular components, etc.

Domes: Notched domes, super-hemispherical domes, hemispherical domes

• Dimensions: Dia 500mm
• PV: 0.2
• Concentricity: 0.05
• Surface defects: 10/20
• Machining Precision and Surface Quality
• Machining precision: Parallelism deviation 0.25’’
• Surface Profile: RMS Full Aperture 13/60

Surface Roughness: 10/20

Grinding: CNC large-scale grinding machines, turning machining centers (capable of processing special bevels, holes, steps, and mounting structures)

Polishing: CNC polishing, robotic polishing, ion beam polishing (10-1000mm), ring polishing, high-speed polishing, large CNC polishing machines, magnetorheological polishing (capable of processing glass and crystals), ion beam polishing. Capable of precision machining large diameters and freeform surfaces.

We possess large-scale vacuum equipment capable of processing large components while ensuring coating uniformity.

NIR (Near-Infrared): 0.75–3.0 µm, covering applications in laser communication, fiber optic communication, and near-infrared imaging

MWIR (Mid-Wave Infrared): 3–5 µm, corresponding to infrared guidance, gas analysis, medical diagnostics, and infrared thermal imaging

LWIR (Long-Wave Infrared): 8–12 µm, corresponding to thermal imaging, military night vision, and similar scenarios

Within the EUV-30 micron range, we offer:

Anti-Reflection Coatings: Enhance transmittance and reduce surface reflection on optical components

High-Reflection Coatings: Increase reflectivity on infrared optical component surfaces

Spectral-Splitting Coatings: Primarily for beam splitters, enabling proportional spectral splitting within this range (e.g., 50/50, 70/30)

Cutoff Filters: Primarily infrared long-pass filters and infrared short-pass filters

Protective Coating (protective DLC coating)

Large-aperture interferometer: Surface profile monitoring exceeding 300mm

Spherical interferometer

Aspheric interferometer: Measures surface shape accuracy, radius of curvature, center position, and full-aperture surface profile error of aspheric optical elements

Profile gauge: Precisely measures local contour curves, curvature, steps, and surface profile cross-sections of aspheric lenses and aspheric window plates

Spherometer: Measures spherical radius, center position, and thickness of spherical lenses and infrared domes

Large CMM: Precisely tests the form accuracy and center deviation of spherical lenses and infrared domes

White Light Interferometer: Measures surface roughness, surface defects, and coating uniformity of mirrors, windows, and filters

Fourier Transform Infrared Spectrometer: Measures infrared transmittance, reflectance, and absorption spectra

Coordinate Measuring Machine: Measures diameter, thickness, edge length, parallelism, perpendicularity, concentricity, and positional tolerances of various optical windows, lenses, and prisms