Good coherence - interference is a property of the wave phenomena. Laser-based, highly directional and monochromatic features, it is bound to the excellent coherence. The early 1990s, a few large companies in Europe and America have produced a commercially available semiconductor laser diode, so that the actual value of the laser to the revolutionary progress. Other types of lasers produce laser mechanism is too complex, so that volume, weight, particularly, higher power consumption reasons, greatly limits the application of the laser. The semiconductor laser of the problems. CR2 battery is used by green laser pointer .
As semiconductor laser technology to mature further, the price gradually reduce its application batch and has been expanding on the current pace of development, the application is very promising. The semiconductor laser is small, light weight, high reliability, high conversion efficiency, low power consumption, drive power is simple, can be directly modulated structure is simple, inexpensive, safe to use, and its broad range of applications. Such as optical storage, laser printing, laser typesetting, laser rangefinder, barcode scanning, industrial detection, test and measurement instrument, laser display, stage lighting and laser show, laser level and a variety of marking location. Some unique advantages of semiconductor lasers to make it very suitable for military applications. The length of this kind of battery is 27mm.
Field ranging, guns, etc. aimed at the shooting simulation system, blinding, submarine communication guidance, fuze, security and so on. Due to the use of ordinary electric bulbs drive, portable weapons and equipment configurations possible. Has been developed and put on the market, the band of the semiconductor lasers have 370nto Alexandra 390r 405r Shan, 430nto, 480hm, 635r dish, 650hm, 670hm, 780hm, 808nm, 850hm, 980rm, 1310hm, 1550hm, etc., which 1310hm 1550hm main for optical fiber communications. 405nm in a 670n. Visible light in 780nm a 1550hm, as the infrared light, 390rm a 370hm ultraviolet wavelengths. The cut off voltage of green laser pointer is 2.0V.
The laser is a high intensity light radiation devices, high-power lasers can be used for cutting and welding of metallic materials, so the laser on the human body, especially the human eye, serious injury, be extremely careful when using. International uniform classification and unification of safety warning signs on the laser, the laser is divided into four categories (Classl ~ Class4), a class of laser is safe, the two types of lasers on human lighter injuries, the three categories above lasers have a serious injury, when used, should pay particular attention to avoid direct human eye. The basic principles of laser ranging technology. Laser ranging to the use of monochrome and coherence of the laser, strong direction stare], in order to achieve high-precision metrology and testing, such as measuring length, distance, speed, angle, and so on. green laser pointer is in the bottle shape.
Laser ranging technical means can be divided into a pulsed laser ranging and continuous-wave phase-shift laser rangefinder. Pulsed laser rangefinder principle of radar range is similar to a laser rangefinder to the target signal, met the goals should be reflected back, due to the propagation velocity of light is known, so long as the round-trip time of the recorded optical signal, To measure the speed of light (30 million km / sec) multiplied by half of the round-trip time is the distance. Now widely used in handheld and portable range finder, the role of distance amounting to one hundred meters to tens of kilometers with an accuracy of about five meters. High-precision range finder, developed in China for satellite ranging measurement accuracy can reach a few centimeters. After the user puts the battery into green laser from the back part of the laser pointer.
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