Optical filters is a device that selectively transmits or rejects a wavelength or range of wavelengths. Different types of optical filters based on mechanisms of operation include absorptive filters and interference or dichroic filters. There are three types of optical filters: shortpass filters, longpass filters, and bandpass filters. Optical filters find application in photography, optical instruments, in color stage lighting, fluorescence microscopy, fluorescence spectroscopy, clinical chemistry, and machine vision inspection. They are also used in the field of astronomy to limit the light passing to a spectral band of interest, and in life science, imaging, industrial, and defense industries.
Increasing R&D in lasers is expected to boost growth of the global optical filter market over the forecast period. For instance, in November 2019, researchers from France reported, in the journal MDPI Fibers, a passively mode-locked oscillator exploiting an active dual concentric core fibers (DCCF) designed to offer a large normal dispersion around 1530 nm. The laser subsequently generated 4 nJ pulses at 16 MHz repetition rate.
Fluorescence filters are used in DNA analyzers. Therefore, increasing adoption and development of DNA analyzers is also expected to boost growth of the global optical filter market. DNA analyzers are used to determine characteristics of a person's DNA. For instance, in November 2019, Asuragen, Inc., a molecular diagnostics company, announced the launch of AmplideX PCR/CE SMN1/2 Plus Kit, which detects variants associated with SMN1 gene duplication events.
Dichroic filters are used in devices such as the dichroic prism of a camera to separate a beam of light into different colored components. Increasing adoption of cameras, either as a hobby or for professional purposes and launch of novel cameras is expected to contribute to growth of the global optical filter market. For instance, in August 2019, Canon launched Canon EOS 90D DSLR and EOS M6 Mark II Mirrorless Camera.
Infrared filters block or reflect infrared wavelengths and allow visible light to pass and are used as heat-absorbing filters in devices such as overhead projectors. Ultraviolet (UV) filters block UV radiation and allow visible light to pass. These filters find application in photographic films and digital sensors. Such benefits of optical filters are also expected to boost growth of the global optical filter market.
Band-pass filters are often used in astronomy. Increasing investment in space exploration and astronomical observations is expected to contribute to growth of the market. For instance, in October 2019, Delta Optical Thin Film AS developed a range of optical filters for Leica Microsystems’ SP8 DIVE Deep In Vivo Explorer.
Key Takeaways
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