green laser pointer is an instrument for pointing
The energy of the photon energy density greatly with E = hv is calculated, where h is Planck's constant, v is the frequency. It can be seen, the higher the frequency, the higher the energy. Laser frequency range 3.846 * 10 ^ (14) Hz to 7.89510 (14) Hz. Electromagnetic spectrum can be broadly divided into: (1) radio waves - the wavelength from a few kilometers to 0.3 meters, the average television and radio broadcasting band is to use this wave; (2) The business area is now unable to do without green laser pointer .Microwave - wavelengths from 0.3 m to 10 ^ -3 meters, these waves is used in radar and other communication systems; (3) infrared - wavelengths from 10 ^ -3 m to 7.8 × 10 ^ 7 m; (4) visible light - which is very sensitive people can narrow a band. Wavelengths from 780-380nm. Just within the atom or molecule changes the electronic state of motion given by the electromagnetic waves. Because it is perceived that we can directly experience and very little of that part of the electromagnetic waves; 5) (ultraviolet - wavelengths from 3 × 10 ^ -7 m to 6 × 10 ^ -10 meters, and the causes of these waves similar to light waves, often issued in the discharge due to its energy and general energy involved in chemical reactions in size, so the chemical effects of UV strongest; 200mW green Laser Pointer has developed into a pint-sized high-tech instrument.(6) roentgen rays - this part of the electromagnetic spectrum, wavelengths from 2 × 10 ^ -9 m to 6 × 10 ^ -12 meters. roentgen (X-ray) is the power of inner atomic electron jump from one energy state to another state or deceleration of electrons in the nucleus when the electric field emitted; (7) γ Ray - is the wavelength from 10 ^ -10 ~ 10 ^ -14 m of electromagnetic waves. this invisible electromagnetic waves are sent from the nucleus to the radioactive material or radiation, nuclear reactions are often associated with this issue. γ-ray penetration is very strong, very destructive to the biological. Seen in this light, the laser energy is not great, but its energy density is large (because of its scope is very small, usually only one point), short time to gather up a lot of energy. green laser pointer is an instrument for pointing and it has been extending continuously 50mW blue violet laser pointer. Third, the characteristics of the laser sensor and its applications: laser precision measuring length measuring length is the optical precision machinery manufacturing industry and processing industry is one of the key technologies the modern multi-length measurement is the use of interference of light waves to carried out, its accuracy depends on the quality of monochromatic light laser is the ideal light source, it is more than the previous best monochromatic light source (lamp krypton -86) also net 10 times so long laser test range, high accuracy by the optical principle known maximum measurable length of monochromatic light with wavelength λ L and the relationship between line width δ is L = λ / δ. -86 krypton lamp can be measured with the maximum length of 38.5 cm.Laser pointing is the rudimental function of 100mW green laser pointer . For longer objects to be segmented to reduce measurement accuracy of leaving. If using helium-neon gas laser, the maximum can be measured several kilometers within a few meters usually measure the length, the precision of up to 0.1 micron laser rangefinder of its the same principle of radar and radio, shoot out the laser at the target after its round-trip time measurement, multiplied by the speed of light to get to and from that distance the laser with high directivity, high color and high-power, etc., for the measurement of these distance, determine the target position.
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