The focus of green laser pointer can be adjusted

 The focus of green laser pointer can be adjusted.
The course of their work. The working principle and structure of the laser. We usually light-emitting objects is called the light source, such as solar, electric lights, burning candles and so on. Light has energy, it can make the object hot, so that the photographic film photosensitive energy conversion phenomenon. Light containing the beam, the beam launched into people's eyes, was caused by human vision, so we can see the light emission of the light. So why do we also see non-luminous objects? Because the light emission of the light shines on them, non-luminous objects by light, the diffuse reflection of light in all directions into the goal of our eyes so we can also see non-luminous objects. The power of green laser pointer by the way is 200mW.
Of laser light and ordinary light is significantly different. Such as ordinary incandescent light source is the current heated tungsten atom to the excited state, in the excited states of atomic spontaneous emission and light-emitting. This ordinary light scattering and diffuse, and can not control the formation of the focused beam, it can not be used in laser printers. The laser beam laser printer must have the following characteristics: high directivity. The beam scattering and diffuse within a certain distance High monochromaticity. White light by the seven-color light. High brightness, beam focus and with a high physical energy. Highly coherent, easy to overlay and separation. The laser is the light of the laser scanning system, directional and monochromatic, coherent high energy concentration, ease of modulation and deflection characteristics. Here will introduce a handheld type flashlight green laser pointer to you customers.They want the battery of green laser pointer can be used longer.
Laser printers of the early production of the use of helium - neon (He-Ne) gas laser, the wavelength is 632.8μm, which is characterized by high output power, large size, long life and reliable performance. low noise and high output power. But because the volume is too large, and now basically obsolete. Modern laser printers use a semiconductor laser, common gallium arsenide - gallium aluminum arsenide series, the emitted laser beam wavelength is generally near-infrared light, with the wavelength of the photosensitive drum with a sensitivity characteristics match. The semiconductor laser is small size, low cost, internal modulation, the light source of the portable desktop laser printers. green laser pointer is specific in design