Laser Pens Must not be Sent Out as Children's Day Gifts!
Time flies in time, and in the middle of the summer, the annual Children's Day is about to come. For the children's long-awaited holidays, parents are still frowning and unable to do anything. What gifts should be given to children? wooden block? Cute doll? Cool robot...
However, parents should not take the laser pens as Children's day gifts send to your children.
Laser pointer structure
Laser pens, also known as laser pointers, star pointer pens, etc., are processed emitters. The common laser pointers are red, blue, green, and blue-violet, and the laser pointers for each color are not the same. Common laser pointers include red light (λ=650-660 nm, 635 nm), green light (λ=515-520 nm, 532 nm), blue light (λ=445-450 nm), and blue-violet light (λ=405 nm). The core part of the laser pointer is the laser diode. Directly speaking, the laser diode may not have any concept, but when it comes to the optical head in the optical drive, it may be better understood. In fact, in a common computer optical drive, a semiconductor laser diode is one of the core components of an optical head, and it is generally formed of a triple heterostructure of AsAlGA ternary compound, which is a near infrared semiconductor device. The wavelength of the light is 780 to 820 nm, and the rated power is generally 3 to 5 mW. In addition, there is also a visible light (eg, red) semiconductor laser diode that is also widely used in optical drives and bar code readers - you can also understand it as a special type of light emitting diode.
However, with our common laser pointers, the power of laser diodes used is much higher than the optical head power of the optical disc drive, which is generally above 250mW. The laser pen power displayed by experts at the 3.15 party was even as high as 1400mW. Laser pen energy is small, but 250mW after focusing is very dangerous.
Although the absolute power of the laser diode used in the laser pointer is not high (even as high as 1400mW, which is 1.4W), the danger is that it concentrates energy on one point.
Experts Advice
As a portable pen transmitter designed with a visible laser, the laser pointer may cause serious damage to the retina, macula, or even permanent blindness in the eye. The macula is in the optical center of the human eye and is the projection point of the visual axis, the most important part of visual acuity. When people concentrate on seeing the laser, the laser will focus on the macula causing macular damage, so use a laser pointer must be careful! Moreover, lasers are mainly used in the military and medical and other professional fields. Even if they are laser products that meet the national standard, excessive contact or careless use will affect vision. The author suggested that ordinary people in non-professional fields, especially children, should not touch laser products.
By the Way
What kind of gift is suitable for children?
In the author's opinion, the companionship of parents will be the most precious gift for children.What do you think? ^_^