Basic Info

Product Description

We can provide virtually any size, shape and quality required by the customer. The range covers more than 60 types including the following types in the visible wavelength range from 200 nm upwards:

• Band pass filters, which allow required ranges to pass through selectively
• Long pass filters, which block unwanted shorter wave ranges
• Short pass filters, which block unwanted longer wave ranges
• Neutral density filters, which have a virtually constant transparency especially in the visible range
• Conversion filters, which due to their spectral range increase or reduce the colour temperature of radiation sources

Materials

• Basic glass
• Ionically coloured glass
• Colloidally coloured glass

Forms of Supply for Optical Glass Filters

• Polished filter: Filters are available as polished plates or round discs with processed edges. Upon request, they are available thermally strengthened and/ or with protective/ antireflective coating
• Filter glass prepared: Rectangular plates and round discs with matt surfaces and processed edges or non-processed edges.
• Standard formats: Plate sizes 165 x 165 + 3-0 mm; Plate thickness 3.5 mm +/- 0.5 mm and 4.5 mm +/- 0.5 mm.

Specifications

Dimensions: from 1 mm - 480 mm
Minimum thickness: 0.1 mm
Tolerances: Up to 0.001 mm
Surface quality: Up to P 4 in compl. With DIN IS0 100110

Upon request, we can produce any size and thickness required within the framework of the maximum size permitted by the type of glass required.

Applications

Optical glass filters are significant components in industrial measurement, control and regulation technology through analytical measuring methods in production, research and development all the way to environment protection and medicine with which to permit or block the transmission of specific spectral ranges.

Filter Glass Types

• UG: Black and blue glass which permits the transmission of UV light
• BG: Blue, blue-green and bandglass
• VG: Green glass
• GG: Yellow glass which permits IR light transmission
• OG: Orange glass which permits IR light transmission
• RG: Red and black glass which permits IR light transmission
• NG: Neutral glass with virtually constant radiation weakening in the visible range
• N-WG: Colourless glass with different cut-off positions in the UV range
• KG: Virtually colourless glass with high transmission of visible light and absorption of IR radiation
• FG: Blue and brown coloured glass (conversion glass)

Aspheric Lens Technology

A sphere is defined by a single radius of curvature. Aspheric Lenses have at least one aspherical surface. Optical engineers generally think of aspheric surfaces as aspheric, rotationally symmetric surfaces. The radius of curvature of the aspheric surface varies gradually from the center of the lens to the edge.

The surface profiles of aspheric lenses are not a portion of a sphere or cylinder. Their curvature radius varies with the central axis. Aspheric lenses have unique advantages over spherical lenses. For example, they can improve optical quality, reduce optical components and design costs. They are widely used in digital cameras, CD players and high-end microscopic instruments.

Difference Between Aspheric & Spherical Lenses

• They provide a thinner profile
• They are lightweight and comfortable
• They could be fit into most frames for a wide choice of styles
• They have a more natural and pleasing appearance
• They don't make your eyes look too big or too small
• They provide better peripheral vision by eliminating distortion

Cylindrical Lens

Cylindrical lens is used to correct astigmatism in the optical system, and, in rangefinders, to produce astigmatism, stretching a point of light into a line. It is usually used in barcode scanners, objective systems and other optical systems.

Feature & Applications

1. Correcting Astigmatism: One of the main applications is in ophthalmology to correct vision resulting from corneal deformation by changing the focal point of axes.

2. Laser Line Scanning: Captures the shape of 3D objects into digital copies. Useful in manufacturing, prototyping, landscaping, and architecture by measuring the deformation of a straight line.

3. Laser Scanning Microscopy: Used with acousto-optic deflectors to focus the light spot onto the correct plane without movable parts.