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Photonics Buyers' Guide / Neutral Density Filters
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There are 60 companies listed in

Market Data

Neutral Density Filters

A neutral density filter is a light filter that decreases the intensity of the light without altering the relative spectral distribution of the energy. Also known as a gray filter.

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Reynard Corporation - San Clemente, CA
Reynard Corporation manufactures custom optics and thin-film coatings from 0.2 to 50 microns (UV-IR). Other in-house capabilities include diamond turning, optical fabrication, photolithography pattern optics, environmental testing, and design services. Prototype to production, ISO 9001:2015 certified, ITAR registered, and Cybersecurity (CMMC) compliant.
• Established in 1984
• 55 employees
• Privately Owned
• Custom Manufacturer
Step Linear Neutral Density Filters
Thin-Film Coatings: Step Circular ND Filters
Custom Circular Variable ND Filters
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Chroma Technology Corp. - Bellows Falls, VT
Manufacturer of optical filters and coatings for many demanding applications such as: biomedical instruments and imaging systems, fluorescence microscopy, aerospace, surveillance, machine vision, industrial inspection such as semiconductors, food and lumber, multispectral imaging, and chemical analysis.
• Established in 1991
• 125 employees
• 41,000-sq ft facility
• Employee Owned
• Stock Manufacturer
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Hoya Corporation USA, Optics Div. - Milpitas, CA
Supplier of color filter glasses and optical materials in raw, semifinished and finished forms. Our color filter glass substrates cover a wide range of spectral characteristics from the UV to IR region.
• Established in 1968
• 25 employees
• 10,000-sq ft facility
• Privately Owned
• Stock Manufacturer
• Custom Manufacturer
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Glass Fab Inc. - Rochester, NY
Manufacturer of custom blanks. Products include fused quartz and silica, optical and filter glasses, and low/ultralow expansion glasses. Capabilities include annealing, slumping, sawing, grinding, edging, drilling, waterjet cutting, and CNC shaping and generating.
• Established in 1974
• 32 employees
• 31,000-sq ft facility
• Privately Owned
• Custom Manufacturer
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Isuzu Glass Inc. - Torrance, CA
Manufacture and designer of integrated lens arrays, microlens arrays, aspheric lenses, and condenser lenses by glass molding. Melting heat-absorbing and laser protection glass; and UV absorbing filters, ND filters, and color glass filters.
• Established in 1905
• 80 employees
• Custom Manufacturer
UV Transmissing Filter - IHU Series
IR Cut Filter- ISK Series
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Knight Optical - North Kingstown, RI
Specializes in supplying precision custom and stock optical and optomechanical components; all custom optics to customer specifications. Products include lenses, prisms, filters, mirrors, retarders, diffusers. Full testing in a state-of-the-art metrology laboratory and 100% visual inspection. Knight Optical is ISO 9001:2015 certified.
• Supplier/Distributor
Neutral Density Filters
Band Pass Filters
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Lambda Research Optics Inc. (USA) - Costa Mesa, CA
Lambda Research Optics manufactures catalog and custom lenses, mirrors, beamsplitters, windows, prisms, filters, and polarizers for defense, commercial, and medical laser applications. Lambda specializes in high-power coatings for excimer, YAG, fiber, CO2 lasers, and FLIR coatings. Precision polishing of CaF2, MgF2, BK7, fused silica, ZnSe, Ge, and Si.
• Established in 1991
• 60 employees
• 36,000-sq ft facility
• Privately Owned
• Custom Manufacturer
UV Reflective Neutral Density Filters
Absorptive Neutral Density Filters
Visible & NIR Neutral Density Filters
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National Photocolor Corp. - Mamaroneck, NY
Manufacturer of thin-film pellicles for use as beamsplitters, beam combiners, attenuators, filters, and optical windows. Standard items, uncoated and coated, are available from inventory; special frames, coatings, flatness, transmission and documentation are available for custom applications.
• Established in 1932
• 7 employees
• 4,000-sq ft facility
• Privately Owned
• Stock Manufacturer
• Custom Manufacturer
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OPCO Laboratory Inc. - Fitchburg, MA
Manufacturer of custom optics, optical replication, diffraction gratings, electro-optical assemblies, metallic and dielectric thin-film coatings for prototype and volume production. State-of-the-art manufacturing, coating, QC, assembly and class 1000 cleanrooms. Serving commercial and defense markets worldwide.
• Established in 1983
• 25 employees
• 15,000-sq ft facility
• Privately Owned
• Custom Manufacturer
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Rainbow Research Optics Inc. - Centennial, CO
Manufacturer of precision optical components and high-power laser coatings from UV to IR. Stock and custom optics: lenses, beamsplitters, filters, windows, mirrors, wave plates, large wedges, prisms, and many more. In-house custom coatings: AR, high reflection, dichroic, and polarizing. Optics from 4 mm to 16 inches.
• Established in 1995
• 75 employees
• 29,234-sq ft facility
• Privately Owned
• Custom Manufacturer
• Designer
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Schneider Optics Inc., Sub. of Jos. Schneider Optische Werke GmbH, Industrial Optics - Hauppauge, NY
Provides high-performance lenses for demanding video, digital projection, and industrial optics applications offering precision optical design, manufacture, test, and distribution of both standard and custom solutions. Serving the precision industrial market, manufactures photographic and industrial lenses and filters.
• Established in 1947
• 40 employees
• 12,000-sq ft facility
• Privately Owned
• Stock Manufacturer
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Spectrogon US Inc., Sub. of Spectrogon AB - Mountain Lakes, NJ
Designer and manufacturer of interference filters: narrow and broad bandpass, long- and shortwave, ND filters, atmospheric windows, AR and metallic coatings. Holographic diffraction gratings: plano, concave and blazed, pulse compression/stretcher gratings. WDM and telecom applications include diode laser tuning gratings and network communications gratings.
• Established in 1975
• 3 employees
• 1,000-sq ft facility
• Privately Owned
• Stock Manufacturer
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Sydor Optics Inc. - Rochester, NY
Custom manufacturer of precision flat-surfaced, parallel, and wedged optics specializing in double-sided polishing for exceptional transmitted wavefront and parallelism. Products include optical and IR windows, glass wafers, color glass filters, mirrors, wedges, plate beamsplitters, and witness samples. ITAR registered, ISO 9001:2015 certified.
• Established in 1964
• 90 employees
• 40,000-sq ft facility
• Privately Owned
• Custom Manufacturer
Custom Optical Filters
Additional Companies

Market Data for Companies in This Category
Countries
40
United States:
6
Germany:
5
China:
3
England:
2
Sweden:
OTHER: 4
US States
13
California:
7
New York:
4
Massachusetts:
3
New Jersey:
3
Pennsylvania:
OTHER: 30
Capabilities
40
Custom Manufacturers:
20
Stock Manufacturers:
6
Suppliers/Distributors:
1
Designer:
Average Number of Employees: 70


The Photonics Buyers' Guide is a comprehensive resource for verified providers of Neutral Density Filters. Profiles and contact information for manufacturers and suppliers are provided by the companies and verified by our editors. If you have updated information about any of the organizations listed, please contact us.
Glossary
  • neutral density filter A light filter that equally decreases the intensity of all wavelengths of light without altering the relative spectral distribution of the energy.
  • light filter A homogeneous optical medium or coating that transmits only in particular regions of the spectrum. It is used to change or modify the total or relative energy distribution of a beam of light.
  • optical density A measure of the transmittance through an optical medium. Optical density equals the log to the base 10 of the reciprocal of the transmittance. where tl is transmittance. In spectroscopy, optical density is the measure of absorbance, and is...
light filtergray filterfilters neutral densityoptical filterfilters light intensitydecrease light intensityopticsnd filters
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