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Liquid crystal lasers promise cheaper , higher color resolution laser televisions at home.
Researchers at the Centre of Molecular Materials for Photonics and Electronics (CMMPE) (part of the Department's Photonics Research Group at the University of Cambridge) are leading the way towards the development of extremely high colour resolution laser displays using liquid crystal laser technology.
Laser displays are new to the market, and are currently being developed by a number of electronics manufacturers. In a laser display, pixels of light emission are generated from three separate red, green and blue (RGB) laser sources. They therefore have a much narrower spectral linewidth compared to the relatively broadband RGB sources from other display technologies, including CRT, plasma, LCD and even the latest organic light-emitting diode (OLED) displays. When these three narrow linewidth red, green and blue sources are combined in a laser display, they offer unprecedented depths of colour resolution over competing display technologies.
Independent red, green and blue liquid crystal laser arrays.
Liquid crystal lasers promise cheaper , higher color resolution laser televisions at home.
Researchers at the Centre of Molecular Materials for Photonics and Electronics (CMMPE) (part of the Department's Photonics Research Group at the University of Cambridge) are leading the way towards the development of extremely high colour resolution laser displays using liquid crystal laser technology.
Laser displays are new to the market, and are currently being developed by a number of electronics manufacturers. In a laser display, pixels of light emission are generated from three separate red, green and blue (RGB) laser sources. They therefore have a much narrower spectral linewidth compared to the relatively broadband RGB sources from other display technologies, including CRT, plasma, LCD and even the latest organic light-emitting diode (OLED) displays. When these three narrow linewidth red, green and blue sources are combined in a laser display, they offer unprecedented depths of colour resolution over competing display technologies.
Independent red, green and blue liquid crystal laser arrays.
CMMPE has been performing extensive research into a new form of laser technology based on liquid crystals. In a recent article in Optics Express, they demonstrated a two-dimensional liquid crystal laser array, consisting of red, green and blue colours simultaneously being emitted from a single liquid crystal laser device, whilst being optically pumped with a single 430nm source. The article suggested that liquid crystal lasers could be used to replace the individual RGB lasers that are currently required in emerging laser displays. This would facilitate a reduction in the fabrication and materials cost of this currently fabrication-expensive technology. Furthermore, liquid crystal lasers are less likely to suffer from problems such as speckle, which are commonly associated with conventional laser display systems.
The liquid crystal laser itself is based on a similar device architecture as a conventional liquid crystal display. Liquid crystals are fast becoming an alternative medium for use as the feedback structure for a wide variety of miniature laser devices. Certain liquid crystal phases, in particular the chiral nematic phase, spontaneously self-organize to form a helical structure with a periodic refractive index. When combined with a gain medium, such as a fluorescent dye, the chiral liquid crystal provides sufficient feedback to generate lasing within a device of thicknesses less than a human hair.
Simultaneous red, green and blue emitting liquid crystal laser array.
The liquid crystal laser itself is based on a similar device architecture as a conventional liquid crystal display. Liquid crystals are fast becoming an alternative medium for use as the feedback structure for a wide variety of miniature laser devices. Certain liquid crystal phases, in particular the chiral nematic phase, spontaneously self-organize to form a helical structure with a periodic refractive index. When combined with a gain medium, such as a fluorescent dye, the chiral liquid crystal provides sufficient feedback to generate lasing within a device of thicknesses less than a human hair.
Simultaneous red, green and blue emitting liquid crystal laser array.
Unlike most conventional semiconductor lasers, the emission wavelength of a liquid crystal laser can be dynamically tuned using an applied voltage to alter the degree of periodicity of the macroscopic molecular structure. A further merit of this technology is that the emission can be chosen to be at any desired wavelength across the visible range through careful control, chemically, of the macroscopic material properties. A gradient in the periodicity of the liquid crystal structure can therefore be formed, which gives rise to simultaneous different emission wavelengths across the device. Such a feature is not readily achievable with existing laser technologies.
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