Laser class 4B from jackery's blog

I doubt whether the young people really thought about the possible consequences of such actions. If you have these extremely bright blue laser pointer, then you should also be punished for it, because this glaring light can also be dangerous when shining into the eye

There are many different types of laser sights. In gas lasers, many different modes can be excited in the cavity, but only modes that do not end up being very lossy are amplified and output - this can result in a single polarization. However, there may be several modes with different polarizations that have this property, creating a more random polarization. There may or may not be a polarizing filter built around the laser aperture. I don't know how much about other types of lasers, but I don't think they're all necessarily polarized.

You can test whether your laser is polarized by putting a polarizing film (such as polarized sunglasses). The laser shines through the film while laser class 4B spins the film. If the intensity of the transmitted bar changes when you rotate the film, then it is at least partially polarized.

There are two main types of high power laser pointer which are dominating the commercial market. Edge-emitting diode lasers have very asymmetrical cavities that lead to polarization with an electric field in the "vertical" direction (perpendicular to the face of the chip), IIRC. The other type, VCSELs, have a much more symmetrical cavity and could be polarized in either direction (although they usually have enough asymmetry selected two preferred polarization axes).

The most common method to produce a 532 nm laser beam is to use a 1064 nm laser diode with a frequency doubling element.

1064 nm lasers are available as edge emitters and VCSELs. I expect (but don't know for sure) that a Rechargeable Laser Pointer will probably be more likely to use an edge emitter. When you have the spec for the diode itself it's easy to tell because for edge spotlights the beam divergence in the vertical direction is much greater. In a laser pointer, it's probably harder to tell which direction that is because even if the original source is an edge emitter they will be using optics to aerocapture the beam.

Laser peak pulse power of 10 watts beat (1 petawatt 200mw laser pointer) and even higher order of magnitude to achieve the femtosecond pulse width (1 femtosecond for thousands of billionths of a second) of intense 5000mw laser pointer is known as the brightest light source known to man, at an unprecedented ultra -High energy density, high electromagnetic and ultrafast timescale to create integrated extreme physical conditions in the laboratory can provide unprecedented experimental means for mankind.

There are different kinds of uses developed by all of those from red, blue, purple, yellow and 532nm green laser pointers and infrared laser pointers etc., usually a low power laser pointer or cheap laser pen is for easy presentation used in teaching, lecture , business conference, speech, powerpoint etc. when a 50mW red, blue or green laser pointer is enough on such kind of occasion. In addition, a low power laser with weak beam visibility is also a nice toy for entertaining your pet dog and cat.

The Swiss Federal Office of Metrology recently measured 48 laser pointers that were confiscated by the canton police after they were used without permission. The examinations showed that only 2 laser pointers adhered to the permissible value, all others were stronger than their class had allowed. One of the devices was even 1000 times more powerful than allowed: Green laser pointer

If the person looks at a light source, the light, including the laser pointer 1000mw laser light, is guided through the cornea and lens directly to the point of sharpest vision (macula).
In the macula, the laser light leads to swelling, bleeding and even retinal holes. These were found in 14 children in America who received laser pointers as gifts on vacation.