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Quick Details

  • Place of Origin: Yunnan, China (Mainland)
  • Brand Name: OPTOLONG
  • Model Number: BPF-940-60
  • Size: square,round or OEM, square,round or OEM
  • Material: Float glass, Float glass
  • Use: Infrared camera
  • Model Name: BPF-940-60
  • color: red
  • ROSH: passed
  • ISO9001: passed
  • SGS: Passed
  • MOQ: 1pcs
  • Shipment: Air/Express
  • Application: Infrared camera

Packaging & Delivery

Packaging Details Safety Packaging

Chinese factory OEM optical products, bandpass filters

and telescope filters from Kunming Optolong

Kunming Yulong Optical&Electronics Technology Co., Ltd. is a professional manufactures of optical 

coatings and optical filters processing in China. Top one Astronomical Interference Optical Narrow 

Bandpass Filters manufacturer in China,Third in the world. We have passed SGS ROHS and ISO9001.

Interference Optical Narrow Bandpass Filters are used to selectively transmit a portion of the well-defined

spectrum while rejecting all unwanted wavelengths. Our Interference filters provide better 

transmission, steeper cut on and cut off slopes, greater blocking, and increased durability.


 940 Bandpass Filter Overview: 


     Working principle: mainly by means of infrared 940nm LED, 940nm semiconductor laser, infrared light source and other various infrared light source to stimulate (emission), the light is reflected back through the 940nm filter to eliminate or filter out stray light, ensure that the received signal is accurate, and will not come out distortion or saturation and garbled phenomenon. Achieve a large amount of data collection and transmission.


Filter advantages:
1) Suitable for sunlight and other bright light interference work;
2) Transmittance up to 90%, and the optical signal attenuation rate is small, effectively improve the working distance and light intensity;
3) Can be directly coating or glue in the infrared transmittance glass by the visible light, rapidly increase the cutoff rate, the vertical incidence in strong light without penetration, light transmission rate is less than 0.2%. And to ensure that working in large angle,and short wavelength shift phenomenon reduction.
4) More than 10 years’ experience in the production of optical filter, imported coating machine to produce, IAD ion assisted deposition technology and to ensure that the low temperature drift and film firmness stronger.


 940 Bandpass Filter Specifications:


940nm-40nm Bandpass filter(AOI=0 degree)


940nm Bandpass filter



Substrate: HWB850

CWL:940+/-10nm   FWHM:40nm+/-10nm


Tave<1% Tmax<1.5% @400nm~890nm

Tave<1% Tmax<3% @990nm~1200nm

Surface quality: 80/50












When the thickness becomes 2.0 HWB850 colored glass

Substrate: HWB850

CWL:940+/-10nm   FWHM:40nm+/-10nm


Tave<0.2% Tmax<1% @400nm~890nm

Tave<1% Tmax<2% @990nm~1200nm

Surface quality: 80/50


940nm-40nm Bandpass filter(The incident angle of 0-24 degrees)




Blocking Band:

Tave<0.1% Tmax<0.5% @200nm~840nm

Tave<0.1% Tmax<0.2% @980nm~1100nm

Surface quality: 60/40

Substrate: HWB850 Bonding Float glass



 940 Bandpass Filter Optical Curvers:  


 940 Bandpass Filter Application:

       Kunming Yulong Optical&Electronics Technology Co., Ltd. is a professional manufactures of optical coatings and optical filters processing in China. Top one Astronomical filters manufacturer in China,Third in the world.Our products include Astronomical Filter,Bandpass Filters,Edge filters, Longpass & Shortpass Filters,Beam spliters,Anti-reflective Coating,Optical Mirrors and so on.Our company were established in 1999,have five precious vacuum coating machines,a set of spectrophotometer (UV-VIS-NIR Shimadzu UV3150) which is imported from Japan.


Core competition ability


Technical Assurance:The CEO has 25 years experience of optical filter design and manufacturing,once 

worked as principal of first Chinese military optical instrument industry.


Spot Supply: Thousands of products have been manufactured each year,some products have been 

standardized,rich merchandise in stock,deeply lower the customer's sample fee and delivery circle.


Quality AssuranceRich experience in ISO9001 management system.


Smooth communications: Six foreign trading sales engineer,outstanding products knowledge and 

communicating skills.


Exhibition & Customer Visitation:

Product Application:


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