NEUTRAL DENSITY FILTER
Keywords:
Keywords:
NEUTRAL DENSITY FILTER
Basic Parameters
Neutral density filter is a filter that only attenuates the light intensity without changing the spectral energy distribution, also known as the attenuator. It can attenuate the light intensity, and after the light in the range of visible light to near-infrared light passes through the neutral density filter, different wavelengths are attenuated in the same proportion, so that the optical element maintains approximately equal light energy transmittance in the wide band. The neutral density filter is divided into absorption type and reflection type according to the different working principle, at the same time, according to the different working area, it is divided into invariant type and variable type, and variable type is divided into continuous type and step type.
Neutral Density Filter - Absorption Type
Processing Index
| Specifications | Absorption Neutral Density Filter |
| Material | Neutral absorption glass |
| Design Wavelength | 400-700nm |
| Dimension Tolerance | +0.0/-0.1mm |
| Thickness Tolerance | ±0.2mm |
| Surface Quality | 80/50 |
| Clear Aperture | >90% |
| Surface Flatness | <2λ@632.8nm per 25mm |
| Parallelism | <5 arc minutes |
| OD Tolerance | ±10% |
NEUTRAL DENSITY FILTER - Reflective(Type)
Processing Index：
|
Specifications |
Reflection Type Neutral Density Filter |
|
Material |
K9 |
|
Design Wavelength |
400-1100nm |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
2.0±0.2mm |
|
Surface Quality |
80/50 |
|
Clear Aperture |
>90% |
| Surface Flatness |
<2λ@632.8nm |
|
Parallelism |
<5 arc minutes |
| OD Tolerance |
OD±10% |
BIREFRINGENT FILTER
Processing Index：
|
Specification |
Birefringent Filter |
|
Material |
Quartz Crystal |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
±0.005mm |
|
Surface Quality |
20/10 |
|
Clear Aperture |
>90% |
|
TWD |
<λ/8@632.8nm |
|
Parallelism |
<5 arc seconds |
|
Thickness |
T=0.5mm, 1.0mm, 1.5mm, 2.0mm |
|
Coating |
N/A |
Solutions
Scientific research and testing field
Aviation field
Medical cosmetology field
Laser field
Related Products
YVO4
Yttrium alumate (YVO4) is an excellent birefringent crystal material, which is a negative uniaxial crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, large birefringence coefficient and easy processing. YVO4 crystal can replace ice SPAR and crystal red stone in the field of optical fiber communication, is the key material in optical communication passive devices such as optical isolators, circulators, polarization splitters, polarizers.
Caicite
Caicite Crystal is a kind of natural birefringent material, in the shape of diamond, birefringence coefficient is large, through the spectrum is wide, from visible to near infrared has relatively good optical properties. Although the mechanical strength of Iceland SPAR material is soft and easy to scratch, it still does not affect its wide application in polarization devices. Caicite is mainly used in Glan POLARIZER.
LiNbO3
LiNbO3 is widely used in optical fiber communication as a birefringent crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, easy processing, and lower material cost than other materials. Lithium niobate crystals are widely used in passive optical communication devices such as optical isolators, circulators, polarization splitters, polarizers, etc
POLARIZING BEAM SPLITTER（PBS）
The polarization splitter prism is plated with a multilayer film structure on the inclined surface of the right Angle prism, and then glued into a cube structure. By taking advantage of the property that the transmission rate of P-polarized light is 1 and that of S-polarized light is less than 1 when the light incident at Brewster Angle, the P polarization component can be completely penetrated after the light passes through the multilayer film structure at Brewster Angle for many times. And most of the S polarization component is reflected. Note: Specific bands and extinction ratios can be customized according to customer requirements.
Product Inquiry
*Note: Please be sure to fill in the information accurately and keep the communication open. We will contact you as soon as possible.
Email Address