Dielectric Spectral Filters

Dielectric Spectral Filters

Dielectric Spectral Filters are thin film based filters which provide higher spectral performance than colored glass filters.  These filters are typically used in applications such as spectroscopy, microscopy, or where heat has to be blocked or transmitted or the illumination spectra has to be cleaned up.

  • Visible Dichroic Filters

    Description

    Visible Dichroic Filters are color filters to selectively pass light of a small range of colors while reflecting other colors. In fluorescence microscopy, dichroic filters are used as beam splitters to direct illumination of an excitation frequency toward the sample and then at an analyzer to reject that same excitation frequency but pass a particular emission frequency.

  • Interference Filters

    Description

    Interference filter is an optical filter that reflects one or more spectral bands or lines and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection Consisting of multiple thin layers of dielectric material having different refractive indices. There also may be metallic layers. In its broadest meaning, interference filters comprise also etalons that could be implemented as tunable interference filters. Commonly used in imaging applications to select particular color bands, such as the red, green, and blue color bands. Custom options - please contact our sales department sales@optosigma.com

  • Short/Long Pass Filters

    Description

    Short/Long Pass Filters are also known as edge filters Longpass — A longpass (LP) Filter is an optical interference or coloured glass filter that attenuates shorter wavelengths and transmits longer wavelengths. A shortpass (SP) Filter is an optical interference or coloured glass filter that attenuates longer wavelengths and transmits shorter wavelengths. Long and short pass filters are also frequently used in Raman Spectroscopy. Custom options - please contact our sales department sales@optosigma.com

  • Laser Line Filters

    Description

    Laser line Filter is a high precision optical filter with an extremely narrow passband centered on a standard laser wavelength. These optical filters are used to prevent the distortion of measurement signals and to increase image contrast.  They are used to screen out undesirable background radiation and ambient light. These filters have excellent blocking (an optical density of greater than 5.0) from ±1% of the laser wavelength. Custom options - please contact our sales department sales@optosigma.com

  • Ultra-Violet Cut Filters

    Description

    Ultra-Violet Cut Filters are compounds, mixtures, or materials that block or absorb ultraviolet (UV) light and typically transmit the visible and IR wavelengths. One of the major applications of UV filters is their use as sunscreens to protect skin from sunburn and other sun/UV related damage.

  • Sharp Cut Dichroic Mirrors

    Description

    Sharp Cut Dichroic Mirrros, sometimes called dichroic filters, are thin-film coatings that include short wave pass and long wave pass filters. Specifically, these coatings transmit one range of wavelengths while blocking others. Suitable for use in Bio-imaging and flow cytometry applications. Custom options - please contact our sales department sales@optosigma.com

  • Notch Filters

    Description

    Notch filtersare also known as a Band Stop filter or Band Reject Filter. These filters reject/attenuate signals in a specific frequency band called the stop band frequency range and pass the signals above and below this band. For example, if a Notch Filter has a stop band frequency from 1500 MHz to 1550 MHz, it will pass all signals from DC to 1500 MHz and above 1550 MHz. It will only block those signals from 1500 MHz to 1550 MHz. In telephone technology, Notch filters are also used as the telephone line noise (Harmonics) reducer and DSL performance of internet service. Other common applications include; Optical communication technologies and the best example is Raman Spectroscopy. At the end of optical fiber, there may be some interfering frequencies of light that make the distortions in the light beam of optical fiber. Then these distortions are eliminated by the narrow band-stop filters. In image and signal processing, these filters are highly preferred to eliminate noise and used to reduce the static on the radio, which is commonly used in our daily life. Custom options - please contact our sales department sales@optosigma.com

  • Cold Mirrors/Filters

    Description

    Cold mirrors are specialized dielectric mirrors. They can also be described as a dichroic filter that reflects the entire visible spectrum while transmitting infrared wavelengths. Similar to hot mirrors, cold mirrors can be designed for an incidence angle ranging between zero and 45 degrees, and are constructed with multi-layer dielectric coatings, in a manner similar to interference filters. Cold mirrors can work as dichroic beamsplitters within laser systems and are frequently used in lighting applications where excessive heat is not desired. Custom options - please contact our sales department sales@optosigma.com

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