Optical Filters- Dichroic Color Filter, Neutral Density Filter, IR Cutoff Filter, Shortpass Filter, Longpass Filter, Bandpass Interference Filter

DELN can provide all kinds of  optical filters.

Colored Glass Filter

Due to its selective absorption in visible wavelength range, color glass filter will exhibit various color depending the glass type. Color glass filter provides an economical filter for various applications.

DELN Color glass filter have a wide variety of market applications ,including Biomedical Instruments, CCD system, Color process, scanner device, Fluorescence Instruments, spectrophotometer calibration , Entertainment Lighting and laser beauty-care devices coating.


Bandpass Interference Filter

Optical bandpass Interference Filters are used extensively in a variety of biotech, biomedical, and quantitative chemical applications to selectively transmit a narrow range of wavelengths while blocking all others.
 
Interference filters are widely used in instrumentation for clinical chemistry, environmental testing, colorimetry, elemental and laser line separation, flame photometry, fluorescence, immunoassays, etc. In addition, interference filters are used to select discrete spectral lines from arc or gas discharge lamps (Hg, Xe, Cd, etc.) and to isolate a particular line from Ar, Kr, Nd:YAG, and other lasers.
 
DELN provides variety band pass interference filters of from ultraviolet to near infrared spectral range.


Specifications
 

Longpass Filter

Long pass filters are designed to transmit wavelengths greater than the cut-on wavelength of the filter.


Long pass filters are used to isolate portions of the spectrum in a variety of industrial or life sciences applications including microscopy or fluorescence instrumentation.

Certain Long pass Filters can also be used as cold mirrors to minimize the heat buildup often caused by infrared radiation.

DELN offers a variety of long pass filters with high blocking and maximized transmission.


Specifications

  
Other Cut-On Wavelength and specifications are available upon request.


Shortpass Filter

Short pass filters are used to transmit wavelengths shorter than the cut-off wavelength of the filter.

Short pass filters are commonly use in life science applications including fluorescence microscopy or for integration into a variety of instrumentation.

These optical filters can also be used as hot mirrors to minimize unwanted heat caused by infrared radiation.

DELN offers a variety of short pass filters with high blocking and maximized transmission.


Specifications
 

 Other Cut-On Wavelength and specifications are available upon request.


IR Cutoff Filter

Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce true color images. An IR cut-off filter blocks the transmission of the infrared while passing the visible.The frequently used Specifications are as below:


 

Other types are available upon request.


Neutral Density Filter

Absorptive Neutral Density (ND) Filters
These filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, neutrality and density of absorptive filters are a function of the material and the thickness.




Specifications
 




Reflective Neutral Density (ND) Filters
These filters have constant density values across the surface. The transmission to reflection ratio varies with density selection. ND filters are used primarily for the attenuation of light over a wide spectral range. They are often used in laser and photometer applications.



Specifications

 Variable Neutral Density Filter

Circular ND filters provide continuously variable, linear attenuation of light by rotating the filter about its center. Transmitted intensity varies as a function of the optical density range. The filter can be used for white light as well as for lasers. A large finite aperture can be attenuated by counter rotating two filters in series. Sizes are available from 25.4 mm to over 100 mm in diameter. The useable wavelength range is from 250nm to 2500nm.
 
Substrate Material: BK7, B270, Fused silica
Standard Linearity: +/-5% of end density value
Optical Density (O.D): 0.04-1.0;   0.4-1.5;   0.4-2.0;   0.4-3.0;   0.4-4.0



DELN can also provide Circular Stepped Variable Neutral Density (ND) Filters, These filters are available with 11 steps and are made from BK7 or UV Fused Silica substrates for visible and UV light applications.
 
Optical Density (O.D)

Optical Density (O.D): 0.04-1.0;   0.4-1.5;   0.4-2.0;   0.4-3.0;   0.4-4.0

Rectangular Variable ND Filters are also available.


Dichroic Color Filter

45° Reflective Dichroic Color Filters

DELN 45° Reflective Dichroic Color Filters are designed to be used at a 45° angle of incidence and will reflect the stated color while transmitting the remaining visible wavelengths. 

Each filter provides greater than 98% reflection over the specified color range and greater than 90% transmission of the remaining wavelengths.


Specifications
 


0° Dichroic Color Filters


DELN 0° Dichroic Color Filters are commonly used for color separation and contrast enhancement applications. these filters are easily integrated into a variety of existing camera and illumination setups.


Typical configurations include photo enlargers, beam separation, and placing filters in front an imaging lens to selectively isolate spectral regions/colors. If the light source is already colored (i.e., red LEDs), then a filter in front of the lens can be used to filter out unwanted ambient light.

Specifications

PMMA IR Plate

Infrared transparent acrylic filters with acrylic base black or dark red material. The properties of the material is given to black vision in the visible range (400-700nm visible light transmittance is less than 1%), but the near infrared wavelength region through the above 720-1100nm, according to the part thickness, transmittance and color infrared waveband, ranging from 80% to 95%.

Widely used in infrared communication components, in the help of the infrared signal at the same time, because of the visual black, can easily cover the internal structure. A large number of mobile phones, computers, home appliances, automobiles, infrared touch screen, such as infrared signal transmission or infrared window.


Application: automatic instruments, biometric sensors, computers, home appliances, automotive, industrial equipment protection window, smart lighting window, infrared touch screen, such as infrared signal transmission or infrared window, etc.