Laser pointers with 405 nanometers wavelength of light are also called blue violet laser pointers. Although it is rarely prefered to the green and red ones, it could be used for what others do, which also reflects the individual unique aesthetic taste. It is probably not as much preferred lasers as an astronomy laser pointer, because brighter colors would make an object more visible in the sky. However it comes down to all other uses such as pinpointing something on the large screen or on the blackboard.
Green laser pointers is now the world's most popular laser pointers, because the green light than red light 6 times more than red light beam significantly, while the price is much cheaper than the blue and yellow. Green pen is the wavelength of light emitted 500-550nm, the wavelength sensitivity of the coefficient table, as is the closest one wavelength. Green is undoubtedly efficient light source, the eye more easily identified. The green light sensitivity of the human eye is higher than a lot of red; the other is green light scattering in the atmosphere more than red light.
Red laser pointers, wavelength 630-670nm green laser pointer is more for longer. The first red pointer was released in the early 1980s. Nowadays, the red laser diode technology has been very mature. More durable, the price is much more cheaper than ever. More easily transmitted red light air, dust, water vapor, so the light path can be seen to need more power. 100 mW red laser pointers probably only about 20 milliwatts, and green. Do remember that red laser pointers are powerful since the light they emit is powerful when it hits a certain object and converges into a point.
Place to note
Now, more and more laser pointers and flashlights sold in the market are class IIIB with a power over 5mW. But when the laser directly penetrates into the eyes, there may be some damage. Especially to some high power laser pointers, diffuse light probably damage the eyes, the focus are more likely to ignite flammable materials. Therefore laser pointers are not a toy, not suitable for children. When operating high-power laser, wear special secure glasses would be safe, especially for the invisible laser. In a word, no matter how much power the laser power is, you need to avoid hitting into your eyes.
This 200mW 405nm Adjust Focus Blue-violet Laser Pointer Pen with 18650 Battery is small and exquisite, portable and with richer applications. The laser pointer can be seem miles away during daylight but beam it produced is visible at night looking like an extra long light saber. Widely used it to point at the faraway target or stars and sending out the SOS signal anywhere anytime. What's more, black body makes the laser light in the night vivid and unique. This blue-violet laser pointer is also the best gift for friends and families.
Made of high quality material, so it is enough durable for long time
The blue-violet laser can be seem as far as the eye can see
Power saving, compact and reliable
Simply press the button to activate the red laser pointer and release it
Lightweight and handy design, it is very convenient to put in bags or
Perfect for teachers, professors, doctors, managers, engineers and so
Blue-violet laser beam
Laser output power
1 x 18650 2200mAh 3.7V battery
3V - 4.2V
500 - 5000meters
0℃ - 40℃
0℃ - 40℃
14.3 ( L ) x 2.2 ( D )cm / 5.63 ( L ) x 0.87( D )inch
Its length and width
It is placed with battery
Bright red light
You can use the laser pointer pen for camping, architecture, SOS and astronomy
The "picture show" is only for your reference, please make the object as the standard.
1 x 200mW 405nm Adjust Focus Blue-violet Laser Pointer Pen
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Date Added: 01/19/2016 by marisa tarasco
my battery arrived dead. however, everything else seems to be in order. also not to sure about the output being 200mw but it does burn electrical tape.