Green laser pointers are the pinnacle in high-end laser light technology, thus they are more expensive and hard to get. Many laser companies may be found on Google, but their 'hand-made' laser pointers are really risky products. After all, a laser is never safe if you use it in wrong ways and if you use the 'wrong' ones, there will be hell to pay. If you want to buy cheap and guaranteed laser pointers, especially green laser pointers, do research on the manufacturer before buying. Here are some tips on how to choose a laser pointer.
1、carefully observe the light spot in poor light, if there is specific flood light around the laser spot, it indicates that the lens failed;
2、observe whether the spot has a perfect solid dot;
3、carefully observe that if the laser beam is fitful, which indicates that the LD is not so good.
green laser pointer structure
4、if it is a low power laser pointer (20 mW or less),we just need to observe that whether the brightness of the laser beam projected will change from dark to light the laser light when the injection will become dark and light, it will indicates that the laser pointer circuit or LD have problems.
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