Product Description:Filters with cut-off regions on both sides of the transmission band of the spectral characteristic curve are called bandpass filters. Bandpass filters are an important class of optical thin film components, which have been widely used in chemistry, spectroscopy, lasers, astrophysics, optical fiber communications, biology and other fields. The spectral curve of the bandpass filter prepared by the principle of light wave interference, the spectral transmission area near the wavelength is called the passband of the filter, usually there are cutoff areas on both sides, and there may be bypass bands around the cutoff area. Tinted glass, absorbing films, or cut-off filters to eliminate bypass bands.
Bandpass filters are roughly divided into broadband filters and narrowband filters according to their spectral characteristics. The two types of filters are usually combined. The principle of light wave interference is used to prepare bandpass filters. Pass filters are widely used in various fields.
Bandpass filters can be divided into: narrow-band filters and broadband filters according to spectral characteristics, but there is no clear boundary for this division, and filters whose relative half-width is not less than 20% are usually called broadband filters piece.
Product categories:
1. Broadband filter:
Broadband filters can often be combined with short-pass and long-pass filters. Considering the absorption characteristics of the film, some short-pass or long-pass filters can be used as broadband filters by themselves. The cut-off filter film system can be plated on different substrates, and several cut-off filters with different cut-off wavelengths can form a set of broadband filters with different half-widths and peak wavelengths. Films are not suitable for imaging systems because multiple reflections between films may cause ghost images. In order to eliminate ghost images, the entire thin-film filter must be coated on the same side of the substrate, and the most efficient design method is still to use a symmetrical periodic film system.
2. Narrow Band Filters:
The narrow-band filter allows optical signals to pass through in a specific wavelength band, while the optical signals on both sides that deviate from this band are blocked. The pass-band of the narrow-band filter is relatively narrow, generally less than 5% of the central wavelength value.
Applications:
1) Application of broadband filter:
a) Performance requirements for strong light protection filters;
b) Induction filter film system;
2) Application of narrow band filters:
a) Ultra-narrowband filters for fiber-optic communication DWDM systems;
b) Optical comb filter (Interleaver);
Main Cooperation Materials Manufacturers: CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC
Main Export Countries & Areas: Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.
Raytekoptics Extra value added services offered: 1). Optical workcraft & process solution design; 2). Rough processing raw materials; 3). Semi finishing raw materials; 4). Fabricate custom sizes and shapes; 5). Design and supply custom coatings; 6). Modify and resurface customer supplied materials; 7). Drill holes, notch glass and provide beveled substrates; 8). Precision polish optics with non-standard aspect ratios;
Payment Method: by T/T or Western Union. Delivery time: 7-10 days. Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offersquality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.
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