FOCtek offers high quality Filter include: Colored Glass Filter, Interference Filter, Neutral Density Filter,Dielectric Coating Filter, Lyot Filter and so on.
Specifications of Colored Glass Filter:
Material: colored glass filter
Dimension 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)
Flatness (per 25mm@633nm) :λ (General), λ/10 (High Precision)
Bevel (face width x 45。) :<0.25mm
Coating :Uncoated, Dielectric AR Coating, Dichroic Filter Coating, etc.
Specifications of Interference Filter :
Material: Colored glass filter or optical coating glass
Typical Diameter (Φmm): 12.0, 15.0, 25.0, 25.4, etc.
Typical Thickness (mm): 2.0 ～ 10.0
Dimension 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.
Specifications of Neutral Density Filter :
Attribute | Specification |
| Neutral Density Glass Type | Metallic Coating Type |
Material | Optical Neutral Density Glass | BK7, Fused Silica |
Typical Size (mm) | Ф25.0, 50.0 x 50.0 | Ф25.0 x 2.0, 50.0 x 50.0 x 2.0 |
Size 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% |
Specifications of Dielectric Coating Filter:
Material: Optical glass
Typical Diameter (Φmm): 10.0, 12.7, 15.0, 20.0, 25.4, etc.
Typical Thickness (mm): 0.2 ～ 20.0
Dimension Tolerance (mm) :±0.2 (General), +0.0/-0.05 (High Precision)
Surface Quality:80/50 (General), 40/20 (High Precision)
Wavelength (nm): Upon request
Coating: Dielectric coated AR, HR, PR, etc.
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