How to Choose a Laser Pointer?
Have you heard the laser pointer? Do you know its magic function? If you are looking for a great and proper laser pointer, I’d like to give some advice before you making a decision. Laser pointer is different from normal toys or tools. If you don’t use it in a correct way, it will impair your or others health. As a result, laser pointer is a prohibited item in some countries. You should know the policy of your country before purchasing a laser.
Laser pointer is commonly used in those domains, such as teaching, speech, medicine, science, astronomy and entertainment. However, it is a difficult for those people to choose a right laser pointer because laser pointers have different types and power.
At first, I’d like to talk about the appearance of laser pointers. The most common is laser pen which looks like a pen. You just need to press the button and the laser will be emitted from the end of the pen. The other one looks like a flashlight. This kind of laser pointer usually has a greater power than laser pen.
And then, let’s have a look at the power specification of laser pointers. When we choose laser pointer, there are some description of specification. It can be divided into two parts: the wave length and the power. The unit of wave length is NM. The common wave length is 532nm. There are other different wave lengths, such as 405nm, 650nm. Otherwise, power is the key factor of laser light. The lowest power is about 3mw. The strongest power can be reach 1000mw. But it is not allowed to use except special purpose with a use license. At market, the laser pointers within 300mw are available.
Third, there are different colors of laser pointers, such as green, red, blue and purple and blue. The common one is green laser pointer. The light of green laser is more visible and brighter than other colors. The green laser is also the hot sale item.
When you are ready to purchase a laser, you should be very clear your purpose. And then you could make a sensible choice at power and color aspects. If you just use it in a speech or class, the laser under 50mw power is your great choice. The lower power of laser, the price is cheaper. If you want to purchase a cheapest laser pointer, you should choose the green color because it is more visible and brighter.
It is said that laser pointer can light a match. It is true, but not for all lasers. As we know, power is the crucial factor to influence laser. In that way, the laser with great power has the function, usually above 200mw power. If you are a astronomer, the green laser with great power your best choice. It has a better effect when you point stars.
As long as the development of technology, its functions are increasingly improving. The first generation is a single laser pen which only can emit a laser dot. The second generation has some electronic functions on the base of the first generation. The typical product is projection laser which has page turning capacity. The latest generation is a breakthrough and innovation of technology. It not only can turn page over, but also is able to write words on screen and operate computer.
In brief, you should get a general idea of your purpose before purchasing a laser. And then you could choose one with a suitable power. The color is also a factors.
Topics: astronomer, astronomy
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