green laser pointer have improved the working efficiency of business persons
Peak: the laser is turned on by the sharp discontinuity occurred in the peak pulse amplitude. 36, outlined the advantages of non-stable cavity. A: Non-stable cavity to produce a single transverse mode wide beam with low divergence of the laser output and can take full advantage of the role of laser material, non-stable cavity to produce a tightly defined spectral characteristics and temporal characteristics of the laser beam, the other due to non-stable vibrations within the cavity is not Gaussian, so there is no contraction plane and the resulting problems. 37, summarized the absolute principle of black body model. The package of green laser pointer applies high-grade box or exquisite satchel.All through the holes injected into the container after several reflections, the inner wall of the container in order to reflect a light, reflected light is incident on the energy E of E is less than one times n times when the first incident, the reflected light En is the energy of the incident light times. If the hole's surface area than the small size of the container, n will be large, so En is very small, close to 0, only a very small amount of light that can shoot through the holes, so it absorbs all wavelengths of light capabilities are close to 1, this model can be considered to be absolute black. 38, according to the different incentives, which can be divided into several types of lasers? The appearance of green laser pointer body applies plastic cement.Optical excitation of the laser discharge excitation lasers, chemical 200mW green Laser Pointer, thermal excitation laser, nuclear-pumped lasers. 39, spectral line broadening and homogeneous broadening can be non-uniform broadening, please cite twelve cases and discussion of homogeneous broadening and inhomogeneous broadening of the essential difference between. Homogeneous broadening of spectral lines in the media are the same for each particle, such as natural broadening, lifetime broadening, pressure broadening, widening, etc., and thermal sub-Lu. Inhomogeneous broadening of spectral lines of each light particle impact and contribution of different. For example, Doppler broadening and other broadening character of random defects. Essential difference: the perspective of instrument line broadening. 40, there is a wavelength λ0 = 0.632nm of the He-Ne laser, the cavity of the two mirrors were 100% and 98%. The appearance of green laser pointer applies the high grade stoving varnish.Cavity -29 length 250nm, the laser level on the life of г21 = 2 × 10 s, the Doppler line width is about transition 1.5 × 10 Hz lasers and other losses of 1% per round trip on average, medium refractive rate n ≈ 1. Estimate the number of the smallest particles of the 50mW blue violet laser pointer density inversion threshold DN.
The original Chinese name of laser called "Laser", "les" is its English transliteration of the name LASER is taken from the English Light Amplification by Stimulated Emission of Radiation the first letter of each word consisting of abbreviations. Means "to expand by stimulated emission of light." Laser has been completely full name in English to express the main process of manufacturing the laser. 1964, in accordance with the well-known scientist Qian proposed that "stimulated emission of light" was renamed "laser."The package of 100mW green laser pointer gives people a decent impression. Laser since the 20th century, following the atomic energy, computers, semiconductors, the human and very, very important [1] great invention, known as the "fastest knife," "the most accurate of the foot," "the brightest light" and "strange laser." It's brightness of the sun's 10 billion times. Its principle as early as 1916, has been found that the famous American physicist Albert Einstein, but until 1960 was only the first successful laser manufacturing. 
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