Photodiodes are often used as photodetectors. Such devices contain a p-n junction and usually have an intrinsic layer between the n and p layers. Devices with intrinsic layers are called PIN-type photodiodes. The depletion layer or the intrinsic layer absorbs light and generates electron-hole pairs, which contribute to the photocurrent. Over a wide power range, the photocurrent is strictly proportional to the absorbed light intensity.
People utilized this ASE process to make broadband ASE light source which is essential for many different telecommunications, fiber sensing, fiber optic gyroscope, and test & measurement applications.
Yorkshire water, the UK water company, and its partners have been awarded a £1.2 million government grant to kick-start research and development of UK underwater fibre optics.
Laser is considered to be one of the greatest inventions of mankind in the twentieth century, and its appearance has strongly promoted the progress of detection, communication, processing, display and other fields. Semiconductor lasers are a class of lasers that mature earlier and progress faster. They have the characteristics of small size, high efficiency, low cost, and long life, so they are widely used. In the early years, infrared lasers based on GaAsInP systems laid the cornerstone of the information revolution.
Recently, Zhang Weijun, a researcher at Anhui Institute of Optics and Fine Mechanics, Hefei Institute of Physical Science, Chinese Academy of Sciences, has made progress in atmospheric nitrogen dioxide (NO2) detection technology. A new method for rapid and sensitive detection of NO2" was published in the American Chemical Society "Analytical Chemistry".
Master Oscillator Power-Amplifier. Compared with traditional solid and gas lasers, fiber lasers have the following advantages: high conversion efficiency (light-to-light conversion efficiency over 60%), low laser threshold; simple structure, working material is flexible medium, easy to use; high beam quality ( It is easy to approach the diffraction limit); the laser output has many spectral lines and a wide tuning range (455 ~ 3500nm); small size, light weight, good heat dissipation effect and long service life.
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