In LPI completed the next phase of development of lasers for projection television.

The principle of the laser TV apparatus developed based on a logical development of an electron-beam light source, wherein the phosphor layer is replaced by a semiconductor active layer in a microcavity. The idea of laser cathode-ray tube by the Soviet scientists, members of FIAN, NG Basov, OV Bogdanovich and A. Nasibova. The first Soviet laser display — "quantoscopes" developed in the Research Institute "Sycamore" in cooperation with the LPI, was released as a finished unit in the late 1980s. It used three cathode ray tubes laser emitting in the red, green and blue spectral regions. It was active display in which an image formed within the light source. At each time point a laser beam coming out of the place of the semiconductor layer, which was sent to the electron beam. The color image was formed by combining three monochrome images on a large external display. But it was a bulky device, which required cooling of the semiconductor layer at low temperatures (-120aboutC). We had to come up with something that would achieve high power light at room temperature. Soon, the whole world has gone the other way — create devices like liquid crystal light valve or gate array of micromirrors. Both of these devices are now quite successful work, but a good source of monochromatic light for these devices is still no. "Today, powerful projectors devices as the light source used primarily arc xenon high-pressure lamp. But the efficiency of xenon bulbs about 1%, if we compare the power that goes into getting the image, and one that uses a lamp. The reason lies in the fact that to obtain high quality images of the continuum to the lamp "cut" relatively narrow lines of the three primary colors: red, green and blue glow, and the rest of the lamp power is converted into heat, we must take, "- says Head of the Head of the Laboratory of lasers with the cathode-ray-pumped, Dr. Frank-m.nauk Vladimir Kozlovsky. Many manufacturing companies are already looking to replace xenon lamps, for example, some of them have chosen to use LEDs. But because of their relatively low brightness (relative to the laser source) with a flow creating projections of several thousand lumens require the use of complicated and expensive optical system. Others are trying to "curb" the laser sources: back in 2002, Q-peak demonstrated laser RGB (Red-Green-Blue) source based on doubling and parametric frequency conversion of solid-state lasers pumped by laser diodes. The first TV commercial laser company Mitsubishi, which appeared on the market in 2008, is based on high-power laser diodes emitting in the red and blue region of the spectrum. As a source of green light it uses the second harmonic of the laser-pumped solid-state laser diodes. However, the systems are not without disadvantages, the main one — the high cost. "Today, it is considered that the market will go in the direction of pico projector, ie projectors, combined with cell phones — continues Vladimir Kozlovsky. — It is expected that such a projection is either already built into the cell phone, or will have a set-top box to a cell phone. This means that all of the information from a mobile phone, we can project onto any type of paper, say, or a wall. But there is a problem: the desired power lasers are already there, but they consume a lot of energy — no battery to work with them can not. It is necessary to improve the characteristics of these lasers — over what many now and work. All these works are based on the development of nanostuktur semiconductor quantum well or quantum dots, which could work with high efficiency at low pump levels. Despite the growing interest in pico projector, we believe that powerful projectors have not lost relevance, in particular for advertising and electronic cinema. " LPI design aims to create nanostructures on semiconductor lasers cathode ray pumped consisting of a large number of thin layers — quantum wells, placed at an antinode of one of the modes of the optical cavity. With such a structure, many problems are solved: the work at an elevated temperature, a significant decrease of the accelerating voltage (several kilovolts) and lifespan. Furthermore, the structure can be used in RGB-light sources for small LCD or DMD projectors. But the main advantage of such sources is their low cost compared with analogues. At present, the members of FIAN, together with colleagues from the Institute of Radio Engineering and Electronics. VA Nyquist Academy of Sciences, Center for Fiber Optics, Technology Center of the University of Sheffield (England), and of Principia LightWorks Inc. (USA) achieved high enough performance on the effectiveness of red laser (on the nanostructure of GaInP / AlGaInP). Offered several viable options green, and blue lasers (special expectations are placed on the structure ZnCdSSe / ZnSSe / GaAs (green light) and ZnSe / ZnMgSSe / GaAs (blue light). Under laboratory conditions have been created laser cathode-ray tubes for nanostructures with a capacity of 9 W 640 nm (red light) 3 W 535 nm (green light) and 6W 458 nm (blue light). Level design red tube close to the industrial development of sealed units (efficiency 10%) remained at this level adjust blue and green tube. This is subject of the next phase of development, which has already started.

 

According to the materials of API "LPI-Inform" Source: www.nkj.ru, www, fian-inform.ru

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