Laser and normal light

Laser and normal light. Just as its name implies is to use laser cutting machine laser cutting machine equipment, the important is the laser and laser cutting machine. The laser is what? What is the difference between it and ordinary light? There is only one accurate laser color, monochrome and a wavelength and natural sun has seven colours. Laser radiation is even inertia to rotate along a straight line ( A single color, single wavelength) And natural sunlight the light is not even used ( There are 7 kinds of color, because natural daylight seven kinds of different wavelength) Laser light is centralized to sighting in a focal point. Even in the distance, the light of the laser light can also take on a focal point. And natural sun light is scattered, so the light is weaker. Laser is one of the main features of can produce extraordinarily high brightness, or has a very high luminous intensity. Any kind of material known on earth, no matter how high its melting point, 1 seconds under strong laser irradiation can begin gasification; Any kind of metal or diamonds, no matter how big the hardness, the laser can be easily punch to it. So, why the laser has such a high luminous intensity? Originally, a luminous light source, tell from the time, generally is continuously launch, a light bulb, for example, has been in the light, after the power supply until the cut off power supply; Tell from the space, it is spread in all directions, thus a light bulb can light up the whole room. That is to say, ordinary light source the light energy both in time and space are diffuse, it is difficult to produce high strength. Laser is very different from this, it can broke out in a very short period of time, the current can achieve a few femtoseconds (short Femtosecond = 10 to 1 15 seconds) That 'blink' than we don't know how many times shorter time! And, its energy often concentrated in a very fine beam, such as beam diameter is only several microns ( = 10 to 1 micron 6 m) Forward propagation, and almost no divergence. In addition, the color of the laser is very pure, in physics, this is called the monochromaticity, thus, can transform the beam through the lens of the appropriate further 'narrow'. It is these characteristics make laser can produce high brightness. Literally a moderate intensity of laser can produce the brightness of the surface is much higher than the sun, the laser ten million units, more than in the world will not run the earth burned to ashes? Answer is completely not the case, the reason is the beam of the laser is a very fine, therefore can only produce high brightness in small areas, and are in need of place, for example, want to punch a hole in a hard object, aim the laser to punch, which was quickly penetrate, around is intact. In a word, the laser is extraordinarily high luminous intensity, and it has very good directivity and monochromaticity inseparable.