Optical Filter Coatings
Optical Filter Coatings
- Wavelength range from 193nm to 12.4µm
- 960 Standard Filter Coating Design
- Offers custom design, fabrication and testing
- Laser line designs that can be used in ultrafast and other laser systems
- Filters for medical devices, semiconductor inspection, machine vision, and more
Overview
Apexel Optics mainly provides filters for colored glass filter applications, fluorescence, dichroic, narrow bandpass, multi-bandpass, notch, edge, and neutral density filters.Whether you need to clean up a laser beam, increase contrast in machine vision, or separate fluorescence from emission wavelengths, Apexel Optics has the right filter solution.
Our advanced coating equipment and techniques offer many advantages over conventional filters in isolating discrete spectra.Our experience in a variety of applications will help you find the best filter for your application. What can we do for you?
Capabilities
Our expert coating designers and technicians are skilled in manipulating coating parameters to meet demanding specification requirements.
* Typical Specifications
| Type | Cutoff filter, Bandpass filter, Negative filter, Neutral filter,Filters for Fluorescence / Life Science Applications,Machine Vision Filters |
| Materials | Regular glass, colored flakes, quartz, sapphire |
| Maximum Size | 200mm |
| Minimum bandwidth | 5nm |
| Wavelength positioning accuracy | ±1% center wavelength |
| Passband transmittance | 95% |
| Cutoff Depth | > OD6 |
| Transition band steepness | 2% of center wavelength |
| IRR ( @632.8nm) | <λ/4 (General), <λ/10 (High Precision) |
Manufacturing Equipment
Apexel Optics has state-of-the-art optical coating facilities including,
- E-Beam Deposition
- Ion-Assisted Deposition
- Ion Beam Sputtering
- Magnetron Sputtering
- Thermal Evaporation
- Hard Coatings for Stringent Environments and Durability
- Automated Ultrasonic Cleaning
Metrology
Apexel Optics performs a range of testing to ensure the highest performance from our stock and custom optical coatings. Coating metrology equipment:
- PerkinElmer LAMBDA Spectrophotometers
- Agilent Cary Spectrophotometers
- Hitachi Spectrophotometers
- Varian Spectrophotometers
- PerkinElmer FTIR Spectrophotometers
- DIC Microscopes
Types of Filters
Neutral density filters
Neutral density filters attenuate, split or combine beams within a certain range of illuminance ratios with little effect on wavelength. Apexel offers two types of neutral density filters: neutral gray glass, and metal-coated filters made of optical glass such as N-BK7, H-K9L fused silica. The thickness of the neutral gray glass type filter determines the transmittance, however, the transmittance is determined by the coating thickness in the optical material type of metal coating.| Attributes | Specification parameters |
| Neutral Density Glass Type | Metallic Coating |
| Material | Optical Neutral Density Glass,N-BK7, Fused Silica |
| Regular size (mm) | Ф25.0 x 2.0, 50.0 x 50.0 x 2.0 |
| Dimensional tolerance (mm) | ±0.2 |
| Parallelism | 3 arc min. |
| Flatness (per 25mm@633nm) | 2λ (General), λ/2(High Precision) |
| Surface Quality | 80/50 (General), 20/10 (High Precision) |
| Optical Density | 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.8, 1.0, 2.0, 3.0, 4.0, etc. 0.1, 0.2, 0.3, 0.5, 0.8, 1.0, 2.0, 3.0, 4.0, etc. |
| Optical Density Tolerance | ±5% |
- Regular diameters are 10.0mm, 15.0mm, 20.0mm, 25.4mm, and other shapes such as square, triangle or other polygons can also be customized according to customer requirements.
- The normal dimensional tolerance is ±0.2mm, and higher precision can be achieved if required.
- The normal parallelism is 3 arc minutes, better parallelism can be achieved if required.
- The normal flatness is 2λ, and higher accuracy can be achieved if required, such as λ/2.
- The regular surface quality is 80/50, and higher precision can be achieved if required, such as: 60/40, 40/20, 20/10.
- Optical density (D) is defined as the logarithm of the reciprocal of transmittance (T): D=log(1/T) or T=10(-D). Conventional optical density is shown in the table above, if required Other indicators can be achieved.
Tinted Glass Filter Applications
Stained Glass Filter Types
| Cut-off color filter glass | Selective Absorption Color Filter Glass | Neutral filter glass | |
| UV glass | UV glass | IR glass | Neutral grey UV glass |
| Gold (yellow) glass | Purple glass | Protective glass | |
| Orange glass | Blue glass | Heat-absorbing glass | |
| Red glass | Green glass | Multi-band calibration glass | |
| Infrared glass | Gold (yellow) glass | Sunroof glass | |
| Orange glass | Color temperature glass (warm up) | ||
| Red glass | Color temperature glass (cooling) | ||
Specifications
| Attributes | Specification parameters |
| Material | Stained Glass Filter |
| Dimensional tolerance (mm) | +0.0/-0.2 (General), +0.0/-0.05 (High Precision) |
| Thickness tolerance (mm) | ±0.2 (General), ±0.05 (High Precision) |
| Clear Aperture | >80% (Small Size), >95% (Large Size) |
| Parallelism | 1 min. (General), 3 sec. (High Precision) |
| Surface Quality | 60/40 (General), 10/5 (High Precision) |
| Surface (per 25mm@633nm) | λ (General), λ/10 (High Precision) |
| Chamfer (face width x 45.) | <0.25mm |
| Coating | Uncoated, Dielectric AR Coating, Dichroic Filter Coating, etc. |
Apexel Optics Tinted Glass Filters can be applied to:
- Photography equipment
- Instrumentation
- Optical equipment
- Medical equipment
- teaching facility
- UV analyzer
- Financial equipment
- Lighting installations for airports
- Military equipment
- Institute of Science
Interference filter
Specifications
| Attributes | Specification parameters |
| Material | Color filter glass or optically coated glass |
| Regular diameter (Φmm) | 12.0, 15.0, 25.0, 25.4, etc. |
| Regular thickness (mm) | 2.0 ～ 10.0 |
| Diameter tolerance (mm) | ±0.2 |
| FWHM (nm) | 10 ～ 80 |
| Wavelength Tolerance (nm) | ±2 ( 10nm FWHM) |
| Surface Quality | 80/50 (General), 40/20 (High Precision) |
| Wavelength (nm) | 220, 254, 265, 280, 295, 313, 340, 365, 405, 340, 380, 400, 405, 430, 450, 492, 497, 510, 524, 530, 546, 550, 555, 578, 590, 592, 600, 612, 620, 630, 690, 700, 750, etc. |
Something else:
- Interference filters of other sizes or shapes can be customized if required;
- The conventional thickness is 2.0-5.0nm, and the customized thickness can reach 2.0-10.0nm;
- The conventional diameter tolerance is ±0.2mm, and higher precision can be achieved if necessary;
- The conventional FWHM (transmission wavelength range, defined by the half value of the maximum width of the transmission curve) is 10nm-80nm, which can be extended to 1-100nm if necessary.
- The normal wavelength tolerance is ±2nm, when the FWHM is 10nm, higher accuracy can be achieved according to customer requirements.
- The conventional surface quality is 80/50, and higher precision can be achieved if required, such as 60/40, 40/20.
- The wavelength range in different applications is different, generally divided into ultraviolet band UV (200nm-399nm), visible light band (400nm-700nm), infrared band (750nm-2500nm), please inform you the wavelength range you need to apply .
Dielectric Coated Filters
Apexel Optics offers dielectric coated filters made of optical materials such as colored glass, BK7, fused silica, sapphire, etc.
This filter includes bandpass filter, dichroic filter, longpass filter and shortpass filter. The transmission range of wavelengths is determined by the customer, and high transmission at specified wavelengths can be provided upon request.
| Attributes | Specification parameters |
| Material | Optical glass |
| Regular diameter (Φmm) | 10.0, 12.7, 15.0, 20.0, 25.4, etc. |
| Normal thickness (mm) | 0.2 ～ 20.0 |
| Diameter Tolerance (mm) | ±0.2 (General), +0.0/-0.05 (High Precision) |
| Surface Quality | 80/50 (General), 40/20 (High Precision) |
| Wavelength (nm) | Upon request |
| Optical Density | 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.8, 1.0, 2.0, 3.0, 4.0, etc. 0.1, 0.2, 0.3, 0.5, 0.8, 1.0, 2.0, 3.0, 4.0, etc. |
| Coating | Dielectric coated AR, HR, PR, etc. |
Something else:
- The material is colored glass, BK7, fused silica, sapphire, etc,
- If required, this filter can be customized in different sizes and shapes,
- UV (200nm-399nm), VIS (400nm-700nm), IR (750nm-2500nm) and other bands can be used,
- Please contact us for more details.
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