Photonics Buyers' Guide / Neutral Density Filters

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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.

www.spectrogon.com

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

www.reynardcorp.com

Reynard Corporation - San Clemente, CA
Reynard Corporation manufactures custom precision optical components and thin-film coatings from 0.2 to 50 microns (UV to far-IR). In-house capabilities: diamond point turning (DPT), optical fabrication, photolithography pattern processing, environmental testing, and design services. Prototype to production, ISO 9001:2015 certified, and ITAR registered.

• Established in 1984
• 45 employees
• 28,000-sq ft facility
• Privately Owned

• Custom Manufacturer

Step Circular Neutral Density Filters

Step Linear Neutral Density Filters

Dual Band IR Bandpass Filters

www.abrisatechnologies.com

Abrisa Technologies - Santa Paula, CA
Designs and manufactures precision optical coating solutions and custom flat glass fabricated optical products. Fabrication: cutting, edging, screen printing, strengthening, machining and cleaning. Coatings: AR, ITO, IMITO, heat control, UV, IR, beamsplitter, mirror and metal, ND filter, wavelength selection filter, dichroic, oleo and hydrophobic.

• Established in 2011
• 150 employees
• Privately Owned

• Custom Manufacturer

Low Reflection & Non-Glare Glass

www.hoyaoptics.com

Hoya Corporation USA, Optics Div. - Milpitas, CA
We are a leading supplier of colored filter glasses and optical materials in raw, semifinished and finished forms. Our colored 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

www.uqgoptics.com

UQG (Optics) Ltd. - Cambridge, England
Manufacturer and supplier of custom optics and catalog stock optical windows, flats, substrates, optical filters, optical lenses, and optical components for OEMs, research, and scientific industries. Materials include fused silica, quartz, color/filter glasses, sapphire, and optical glasses. Micro dicing and assembly services.

• Established in 1955
• 19 employees
• 10,000-sq ft facility
• Privately Owned

• Stock Manufacturer
• Custom Manufacturer

Color Glass Filters

www.arwoptical.com

A.R.W. Optical Corporation - Wilmington, NC
Manufacturer of custom, standard, and OEM optical components and coatings in the UV to IR region. Provides rapid prototyping through volume production. Products include assemblies, beamsplitters, filters, lenses, mirrors, prisms, windows, and wedges.

• Established in 1980
• 10 employees
• 10,000-sq ft facility
• Privately Owned

• Custom Manufacturer

www.berlinerglas.com

Berliner Glas Group - Berlin, Germany
OEM partner for optical key components, assemblies, and systems as well as high-quality refined technical glass - from concept to volume production, Berliner Glas Group companies serve innovative customers in various market segments: semiconductor industry, medical technology, metrology, laser, and space technology as well as the display industry.

• Established in 1952
• 1,300 employees
• 542,500-sq ft facility
• Privately Owned

• Custom Manufacturer

www.bondoptics.com

Bond Optics LLC - Lebanon, NH
Custom manufacturer of precision optical components and precision mechanical glasswork. Materials processed include fused quartz/silica, optical glass, filter glass, Pyrex, Zerodur and ULE. Custom coating and interferometric testing services available.

• Established in 1958
• 50 employees

• Custom Manufacturer

www.chroma.com

Chroma Technology Corp. - Bellows Falls, VT
Manufacturer of optical filters and coatings for biomedical instruments and imaging systems, fluorescence microscopy, astronomy, space exploration, and chemical analysis.

• Established in 1991
• 108 employees
• 21,000-sq ft facility
• Employee Owned

• Stock Manufacturer

www.escooptics.com

Esco Optics - Oak Ridge, NJ
US manufacturer of custom and standard optics for the UV, VIS, and IR wavelengths. In-house production of lenses, windows, mirrors, blanks, prisms, filters, and optical coatings. For over 60 years, we have proudly offered excellent customer service, low prices, and short lead times. ITAR registered.

• Established in 1955
• 48 employees
• 34,000-sq ft facility
• Privately Owned

• Custom Manufacturer

www.ferson.com

Ferson Technologies Inc. - Ocean Springs, MS
Manufacturer of custom precision optical components including lenses, prisms, windows, mirrors, cylindrical lenses, filters, and domes. Capabilities include optical coating design and services, assembly and optical systems. Also will modify existing material or catalog optics to meet applications.

• Established in 1943
• 18 employees
• 20,000-sq ft facility
• Privately Owned

• Custom Manufacturer

www.glassfab.com

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, water jet cutting, and CNC shaping and generating.

• Established in 1974
• 32 employees
• 31,000-sq ft facility
• Privately Owned

• Custom Manufacturer

www.gurley.com

Gurley Precision Instruments Inc. - Troy, NY
Manufactures stock and custom reticles, lenses, prisms, mirrors, resolution targets, step wedges, divided circles, absolute and incremental discs/scales, precision patterns and replications, measuring devices, rotary/linear encoders, engineering and surveying instruments and digital readout systems for machine tools. UV to NIR optical coating capabilities include AR coatings, hot/cold mirrors, dielectric films.

• Established in 1845
• 100 employees
• Privately Owned

• Custom Manufacturer

www.kenteklaserstore.com

Kentek Corporation - Pittsfield, NH
Offers laser safety eyewear, laser barriers, and laser windows. Stock replacement parts for lasers and will rework laser crystals and laser components. Laser and room interlock systems with accessories including lighted signs and remote buttons. Secure online shopping. Experienced technical sales staff for free consultation.

• Established in 1983
• 38 employees
• 16,000-sq ft facility
• Privately Owned

• Stock Manufacturer

www.knightoptical.com

Knight Optical - North Kingstown, RI
Specializes in supplying precision optical and optomechanical components; and in custom optics to customer requirements. Products include lenses, prisms, filters, mirrors, retarders, diffusers and more. All testing done in metrology lab. Technical advice and assistance available.

• Supplier/Distributor

Neutral Density Filters

IBF for Gas Sensors

IR Cut Filter

www.lambda.cc

Lambda Research Optics Inc. (USA) - Costa Mesa, CA
Lambda Research Optics manufactures catalog and custom lenses, mirrors, beamsplitters, windows, prisms, filters, 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

Visible & NIR Neutral Density Filters

Absorptive Neutral Density Filters

UV Reflective Neutral Density Filters

www.nationalphotocolor.com

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
• 5 employees
• 4,000-sq ft facility
• Privately Owned

• Stock Manufacturer
• Custom Manufacturer

www.opcolab.com

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 1976
• Privately Owned

• Custom Manufacturer

www.rr-optics.com

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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OTHER: 5

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OTHER: 29

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Average Number of Employees: 61

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.

light filtergray filterfilters neutral densityoptical filterfilters light intensitydecrease light intensityopticsnd filters

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Neutral Density Filters