Laser pen small common sense

The laser pen we see in our daily life is the use of LD (laser diode: Laser Diode) is the semiconductor laser, not using the LED (Light Emitting Diode: Light Emitting Diode) Both structures are completely different things Although the principle is somewhat similar, LD laser does itself have a one-way, is the use of excitation radiation light intensity is much larger than the LED. The temperature also determines the quality of its best use of the laser pen temperature 20 ℃ ~ +30 ℃.

The laser pen sold on the market is essentially a small laser generator consisting of a laser diode, a control unit and a power supply. It is mainly dependent on the excitation of the laser diode to generate a single wavelength of the directional beam, that is, laser. For lasers, power is an important measure of the amount of energy released per unit of time. Usually the marketplace sells a laser pen that powers from a few milliseconds to several hundred milligrams. The higher the power, the more energy the laser outputs per unit of time. Under normal circumstances, the human body can withstand laser power at about 0.4 milliwatts, high-power laser beam direct eye can cause damage to the retina, and even can lead to permanent vision loss. If a long time direct exposure to the skin, can cause burns.

The difference between laser and other light sources is as follows:

1. Laser has a high monochromaticity, because the laser output light, wavelength distribution range is very narrow, so the color is very pure.
2. The coherence of the laser is high, and the coherence in time and space is good.
3. Laser set of good optical rotation, polarized surface rotation can be called optical properties, so that the laser energy density is higher.
4. Laser for pure sine wave oscillation light, frequency and phase are neat, and natural light clutter is different.
5. Laser line for the parallel light, high directivity after a long distance can still maintain a small beam without spreading.

In order to solve the teachers, trainers, lecturers for ppt and other presentations, but also to return to the desk point of the mouse is not convenient, there is now the laser pen that laser pointer for teach. General meeting and teaching the use of laser pen because the distance from the background dark, power in ≦ 5mW can be used if the high power of the laser pen but will cause the participants eye discomfort, resulting in quality greatly reduced. Kitlaser offers a laser pen that allows users to maximize the advantages of body language, both in teaching and in presentation, to make teaching and speaking more vivid and perfect, and kitlaser sells the laser pen to solve the past in class and conference The inconvenience of using the mouse.