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 Home > Filters > Bandpass Filters > Interference Filters > 650+/-15nm Narrow Bandpass Filter, 650nm Interference Filter
 
650+/-15nm Narrow Bandpass Filter, 650nm Interference Filter
Centre Wavelength(CWL):
650nm, TOL: +/-2nm
FWHM(Width of 50% point):
+/-15nm
Transmission:
Tave>85% @ 635-665nm area
Size:
customized, from 2x2mm to Dia. 50mm, +/-0.1mm
Thickness:
0.3~1.1mm
Surface quality:
60/40~20/40
Clear aperture:
>90%, or full surface coatings
Substrate:
vary customized, such as B270, BK7, crystal, float or soda lime glass etc.
Specially designed for 650nm LED light source
High transmission reach T>=90%
650+/-15nm Narrow Bandpass Filter, or said 650nm Interference Filter, compared to 650+/-25nm filters, it can reduce more unexpected light for some special sensitive sensor requirement, to get the clear signal response. The higher transmission at T>=90% allow this filter available to be combined with other existed filter and still keep the transmission no less than 85%.
650+/-20nm Narrow Bandpass Filter, or said 650nm Laser Scanner Filter, is a new developed spectrum with higher transmission at T>95% @ 650+/-5nm area, perfectly used for laser equipments, such as laser scanners. The noise signals have been deeply blocked, with Tave<0.2% @ other visible light area.
650+/-25nm bandpass filter, based on the common applications, is usually called Laser Scanner Filter, which is commonly used with from 639nm to 660nm laser light sources. It only transmit the small bandwidth of red laser light in the range of 650+/-25nm while block or reflect all the other spectrums. The blocking rate is not very strict for these types of application, because most laser scanner application just mainly required the T>90% @ centre wavelength point, without considering the noise in image forming system.. This type of filter is usually used for laser semiconductor use, such as laser bar code scanner, laser measuring equipment, 647nm laser light source device, NIR range finder, fingerprint identification system etc.

Optical filters are very customized and some times strict requirements for some technical datas. When to select a filter, please tell us where the filter will be used, or tell us what exact features it is expected to reach. We will based on our experiences to offer some suggested advices for customer's reference.

Tips: LED light source commonly face a problem called Spectrum Temperature-drifting, which means the centre wavelegnth of the LED emitting light will drift to right by 3-5nm after a long operation, when the LED temperature reach a high temperature.So when to select a suitable filter, a larger bandwidth should be considered based on the LED type.  

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