what are the characteristics of laser compared to ordinary light?
The rapid development of laser technology and applications has formed a number of application technology fields, such as optoelectronic technology, laser medicine and photon biology, laser processing technology, laser detection and metrology technology, ultrafast lasers, etc.
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So, what are the characteristics of laser compared to ordinary light?
Analysis of the characteristics of laser versus ordinary light:
1. The directionality of the characteristics of laser compared with ordinary light is good
Ordinary light sources (the sun, incandescent lamps or fluorescent lamps) emit light in all directions, and the light-emitting direction of the laser can be limited to less than a few milliradian solid angles, which increases the illuminance in the direction of illumination by ten million times. The laser has a diffusion diameter of less than 1 meter per 200 kilometers. If it hits the moon 3.8×105 km away from the earth, the beam spreads less than 2 kilometers, while ordinary searchlights spread to tens of meters from a few kilometers away.
2. The brightness of the laser is higher than that of ordinary light
Laser is the brightest light source in modern times. Only the strong flash of hydrogen bomb explosion can compare with it. The brightness of sunlight is about 1.865×109cd/m2, and the output brightness of a high-power laser can be 7 to 14 orders of magnitude higher than the brightness of sunlight. Although the total energy of the laser is not necessarily large, due to the high concentration of energy, it is easy to generate high pressure and high temperatures of tens of thousands of degrees Celsius or even millions of degrees Celsius at a tiny point. For example, practical applications such as laser drilling, cutting, welding, and laser surgery take advantage of this feature.
3. The monochromaticity of the characteristics of laser compared with ordinary light is good
Light is an electromagnetic wave. The color of light depends on its wavelength. The light emitted by ordinary light sources usually contains various wavelengths and is a mixture of light of various colors. Sunlight includes visible light in seven colors of red, yellow, green, cyan, blue, and purple, as well as invisible light such as infrared light and ultraviolet light. The wavelength of a certain laser is only concentrated in a very narrow spectral band or frequency range. For example, the wavelength of a HeNe laser is 632.8 nanometers, and its wavelength range is less than one ten-thousandth of a nanometer. For example, the good monochromaticity of laser provides an extremely advantageous means for precision instruments to measure and stimulate certain chemical reactions and other scientific experiments.
4. The coherence of the characteristics of laser compared with ordinary light is good
Interference is an attribute of wave phenomena. Based on the characteristics of high directivity and high monochromaticity of laser light, it will inevitably be light with excellent coherence. This characteristic of laser makes holography a reality.
Lasers are widely used, including laser marking, laser welding, laser cutting, optical fiber communication, laser ranging, laser beauty, laser scanning, LIF non-destructive testing technology and so on. Laser systems can be divided into continuous wave lasers and pulsed lasers. （Laser Cutter, Engraver & Marking Machines Factory）Carmanhaas offer professional Laser Cutter, Engraver & Marking Machines,optical systems etc. welcome to contact us!