NakuLaser Blog

Lasers  are widely used in home appliances, medicine, industry, telecommunications and other fields. A few years ago, scientists introduced the concept of nanolasers. Their design is similar to traditional semiconductor lasers based on heterostructures that have been used for decades. The difference is that the cavity of nano lasers is very small, proportional to the wavelength of the light they emit. Since they mainly produce visible light and infrared light, their size is about one millionth of a meter. Nano lasers  have unique properties that are distinct from macro lasers. However, it is almost impossible to determine under what current the output radiation of a nanolaser is coherent; in addition, for practical applications, it is important to distinguish between two states of a nanolaser: a real laser effect with coherent output at high currents and a LED-like state with non-coherent output at low current. Researchers at the Moscow Institute of Physics and Tech...

High-power lasers usually generate large amounts of heat, which can easily damage the laser tube for a long time. It is not recommended to use high-power lasers for a long time. Sometimes, the user needs to make the high-power laser work continuously for a long time. Is there any way? Figure 1. Without heat sink, can not work continuously for a long time We have summarized some experiences in actual work to share with you. 1. Select Laser Ask the merchant if the laser is with TEC when buying. TEC (Thermoelectric Cooler) is a semiconductor refrigeration chip, which is widely used in temperature control in various equipment. Figure 2. Heat sink and fan Laser working at high temperatures will cause damage to the laser tube, so it is also necessary to bring an overheating protection module. When the temperature rises to the limit of the laser tube, the laser must automatically stop working. 2. Do a good job of heat dissipation As long as the heat dissipation is done, t...

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Since the emergence of lasers in rubies in the 19 6 0s, in the same year, calcium fluoride (CaF2:Sm2+) was found to output pulsed lasers. In the second year, pulsed lasers were obtained in ytterbium-doped silicate glass. The rare earth has formed an indissoluble bond. Rare earths have many properties such as magnetism, light, electricity, superconductivity and catalysis. They are one of the most important materials in this century. They are widely used in many fields. As a non-renewable resource like oil, they are valued by many countries. Strategic resources. Since the rare earth was bonded to the laser, the utilization of rare earth in the laser has been deepened. In 1962, the CaWO4:Nd3+ crystal was used to output the continuous laser. In 1963, the rare earth chelate liquid laser material was firstly developed, and the erbium-doped benzoylacetone was used. The pulsed laser was obtained from the alcohol solution. In 1964, the ytterbium-doped yttrium aluminum garnet crystal (Y3Al5...

1.  L aser working medium The laser  must be produced by selecting a suitable working medium, which can be a normal body, a liquid, a solid or a semiconductor. In this medium, particle number inversion can be achieved to produce the necessary conditions for obtaining a laser. Obviously, the existence of the metastable energy level is very advantageous for realizing the population reversal. There are nearly a thousand working media available, and the laser wavelengths that can be generated include the far infrared from the vacuum ultraviolet ray, which is very extensive.  As the core of the laser, it consists of activated particles (both metal) and matrix. The energy level structure of the activated particles determines the laser characteristics such as the spectral characteristics and fluorescence lifetime of the laser. The matrix mainly determines the physical and chemical properties of the working substance. According to the energy level structure of the activated...

Chinese researchers prepared large-scale light quantum chips and successfully performed an important analog quantum computation demonstration. According to a study published in the latest issue of the "Scientific Progress" magazine, Shanghai Jiaotong University's Jin Xianmin team produced a 49x49 light quantum computing chip using "femtosecond laser direct writing" technology. Correspondent author Kim Hyun-min told Xinhua News Agency reporters that this is the world's largest light quantum computing chip. The researchers used this chip to demonstrate an algorithmic kernel "quantum random walk" that simulates quantum computation. Kim Hyun-min said that when this quantum evolution system is sufficiently large and can flexibly design its structure, it can achieve a variety of algorithms and computational tasks, performing far better than traditional computers. In recent years, news about general-purpose quantum computers has often been seen in n...

Unexploded bombs are and will remain a serious threat to civil security in many parts of the world. To be able to deactivate these bombs more safely in the future, Laser Zentrum Hannover (LZH; Germany) is working on a laser-based bomb-defusing method together with Laser on Demand (Burgdorf, Germany) and the Kampfmittelräumdienst Hamburg (KRD). The challenges and dangers of conventional defusing methods are enormous and still highly topical: The amount of weapons hidden underground in Germany is difficult to predict, but according to KRD estimates, about 60,000 tons are still in the ground. During the defusing process there is an extremely high risk of unwanted detonation, especially in complex ignition systems. Often blowing up the dud remains as a last resort. Weakening of the casing takes explosive power In the DEFLAG project, the project partners LZH and Laser on Demand are working on a procedure to defuse the bombs by targeted deflagration. In contrast to a detonation, a lower...