Optics & Allied Engineering Pvt. Ltd.

Filters

Following is a short review of filter specifications to assist you in formulating requirements for your particular application.

Center wavelength
Center wavelength (CWL) is the arithmetic mean of the pass band expressed in nanometers. For example, a HeNe Laser would have a center wavelength of 632.8nm. Center Wavelength tolerance: ± FWHM

Percent Transmission
Percent transmission is the amount of power received by the detector compared to the total power received. Or Percentage of light pass in particular Wavelength

Bandpass
It is the width of the pass band, measured in nm, at the half-power points of the pass band. It is often expressed as Full Width at Half maximum (FWHM). Tolerance: ±20% of FWHM. Bandpass shape It can vary from triangular to nearly square. The number of cavities in a filter describes the overall spectral shape.

Out-of-band rejection
out-of-band rejection (Blocking), is the amount of the energy , outside the filter pass band, transmitted through the filter. it is often expressed as an absolute level. For example 10-4 , means transmission outside the pass band is 0.01% , Unit: Optical Density (O.D.).

Filter Dimension
Filter dimension are specified in inches or millimeter along with tolerance. Surface Quality: 80-50 scratch-dig.

Please Give Following information while sending the Order or Enquiry
Center Wavelength: ?
FWHM : ?
Percent Transmission :?
Size: in Diameter :?
Thickness:?

OPTICA ' s filter are designed for operation at 23 degrees Celsius, these filters can be used throughout the temperature range of -50 to +100 degrees Celsius as long as thermal shock is avoided.

Color Glass Filter
Color glass filter stands out due to its selective absorption in the visible wavelength range. The filters appear to be colored if their filter effect lies within the visible light spectrum.

SCHOTT, one of the leading filter glass manufacturers with a wide product range.

Our range of glass filters with more than 60 types includes the following filter 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



These Filters have wide application in Sensing, Color Sorting, Analytical Instruments,Imaging and Medical

Size: Dia. 3 mm to 160mm, Square 5mm to 160mm

We offer following Std Color Glass Filters as follows

Interference Filters

Interference bandpass filters are relatively inexpensive wavelength selectors that allow transmission of a predetermined wavelength while rejecting or blocking other wavelengths. Interference filters are widely used in instrumentation for clinical chemistry, environmental testing, colorimetry, elemental and laser line separation, flame photometry, fluorescence, immunoassays, etc.


Specifications

• Mount Diameter:10mm to 25.4mm +0/-0.2mm 
• Clear Aperture:>80% 
• Thickness:<10mm 
• CWL Tolerance: ±2nm 
• FWHM :10nm 
• Peak Transmission: >45% 
• Block :<0.01%(X ray to 1100nm) 
• CWL Shift :<0.02nm/℃ 

Narrow Bandpass Interferencefilters

Specifications:

• Central Wavelength (CWL) Tolerance: ±2nm 
• Full width-half Maximum (FWHM): 10nm 
• Operating Temp.Range: -10° C to +70° C 
• Surface Quality: 80-50 
• Blocking: 100 nm to 1200nm 
• Application: Water and environmental testing, clinical chemistry, colorimetry, photometry, lasers, color sorting ,sensing and detecting

OPTICA can provide following typical Narrow Bandpass filter: CWL(nm) 340, 405, 420 ,430 , 450 , 470, 480, 492 ,500 505,510, 520, 532, 540, 546 ,550, 580,590, 600 610, 630, 650, ,690,730,780,830,900,940,1064


COLD MIRROR ( HEAT TRANSMISSION FILTER)
Cold Mirror is used to in certain applications where it is desirable to reflect visible light, but transmit the IR (heat energy) to replace the Hot Mirror.

Application :

• Medical Illumination 
• Projection System 
• Photo Copies 
• Reflector 
• Scanner 

Features :

• High infrared transmission 
• Excellent visible light reflection 
• Humidity. Adhesion. Abrasion Resistance 

Available Glass Materials

• Soda-Lime Glass, Tempered Glass, Borofloat Glass, Borosilicate Glass 

Technical Specification

Standard Spectral Characteristics 

• Visible Reflection : 400 - 700nm Ravg > 97%
• Infrared Transmission : 750 - 2500nm Tavg > 88% T50% at 740 ± 10nm 
• Maximum Operation Temperature 
• Soda-Lime Material : 150 °C 
• Tempered Material : 250 °C 
• Borofloat Material : 450 °C 
• Available Sizes 
• Standard Thickness : 1.10mm 
• Square : 7mm - 300mm 
• Optional Thickness : Round : 10mm - 450mm , 0.55mm , 1.86mm ,2.86mm 
• Cutting Tolerance ± 0.1mm

DICHROIC FILTERS
OAEPL Dichroic Series have been designed with the assistant of entertainment and architectural lighting designers, which provided a comprehensive selection of consistence shades express perfect images for both interior and exterior applications. Some of the subtle, pale also offer you a unique alternative to create various aesthetic effects for architectural use and characteristic lighting.

OAEPL Dichroic Series provide you the flexibility to choose suitable colors for your projects and the benesfits of absolute spectral stability in addition to excellent resistance to environmental degradation.


OAEPL Dichroic Filters
28 kinds of standard colors
6 kinds of color correction filters.
Correspond to LEE and ROSCO
Size : 50 x 50 with 1.10mm thickness
Substrate : Borofloat glass material

Technical Specification
Humidity. Adhesion. Abrasion Resistance
Available Glass Materials : Soda-Lime Glass, Tempered Glass, Borofloat Glass & Borosilicate Glass
Maximum Operation Temperature : Soda-Lime Material : 150 °C, Tempered Material : 250 °C & Borofloat Material : 450 °C
Available Sizes : Square : 7mm - 300mm & Round : 10mm - 450mm
Standard Thickness : 1.10mm
Optional Thickness : 0.55mm, 1.86mm & 2.86mm
Cutting Tolerance : ± 0.1mm
Color Tolerance : ± 5nm of Designed Half Height

UV TRANSMISSION FILTER
UV Transmission Filter is used to special applications that need to transmit the UV energy and reflect most visible light to illuminate the subject with any various effects.

Application :
Fluorescent effect for Lighting and Stage
Tanning Bed
Lead Detector

Features :
UV energy transmission
Visible light reflection

Technical Specification

Standard Spectral Characteristics
UV energy Transmission : 380 - 400nm Tavg. > 80%
Visible Reflection : 450 - 700nm Ravg. > 98%

Available Glass Materials : Soda-Lime Glass, Tempered Glass, Borofloat Glass & Borosilicate Glass
Maximum Operation Temperature
Soda-Lime Material : 150 °C, Tempered Material : 250 °C & Borofloat Material : 450 °C
Available Sizes : Square : 7mm - 300mm & Round : 10mm - 450mm
Standard Thickness : 1.10mm
Optional Thickness : 0.55mm, 1.86mm & 2.86mm
Cutting Tolerance : ± 0.1mm