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Recently, in the famous website design unveiled the a new laser pointer, with simple style and comfortable use feeling, can effectively and stably display circle, point and line, and does not destroy the presentation of fluency. It is out of the traditional pointer design and is shaped into a stylish ring on the finger. Designers from the initial dot matrix laser pointer, and added a sliding button to help draw the circle and line. When the pointer is set on the index finger, the thumb can be used to slide the button on the ring. A circle, points, lines, and three options button, when to slide show circle, slide, the higher the larger circle; when down slide show lines, slide lower the longer the line; button placed intermediate time is displayed and the old section of the pointer as dots. In the course of the demonstration, the presenter can move their hands freely, which emphasizes the important area through the circle, the point and the line. With a new laser pointer, the presenter can be more focused on speech and presentation, rather than groping in the hands of a small tool, so that you will be handy in the speech.
Red light laser pointer 200mw structure is the most simple, the reason why simply because the red laser pointer is basically a battery powered by the diode. And a laser diode with the wavelength. Red laser appeared in the early 1980's, is a huge and bulky equipment worth hundreds of dollars; it is very small and very cheap.
The use of wavelength 808nm infrared laser pointer 1000mw to stimulate the nonlinear crystal, produce 1064nm infrared light, and then the second harmonic generation 532nm green light, which belongs to the solid laser. Some green lasers work in the pulse or quasi continuous mode to reduce the cooling problem, to extend the battery life. The announcement does not require frequency doubling of the green laser has a higher efficiency. In the night even the low power of the green light due to the atmospheric molecules of the Rayleigh scattering can also be seen, the laser pointer is often used by astronomy enthusiasts for pointing stars and constellations.
The market appears to have a wavelength of 593.5nm yellow light laser pointer 2000mw. By using DPSS technology to wavelength of two laser beams 1064nm and 1342nm through a nonlinear crystal phase. The complexity of the process makes the yellow laser pen unstable and low efficiency, with the change of temperature output power in the 1-10mW, if the overheating or too cold will occur mode jump. This is because the size of the laser pointer does not provide the required temperature stability and cooling components.
Laser pointer is the presentation of the most common one of the tools, however, are now using a laser pointer will have limitations, because the only point to a point, demonstration in the demonstration process often have to hold it to find a point to the location, waving a pointer to draw circles and lines will dry disturbing the audience's attention.
There are no mirror reflectivity, the mirror is generally about 90%, optical instrument can reach about 97%; the rest is then is absorbed; we assumed that a laser pointer 1000mw effective radiated power, the active area to 1 mm2, with up to 97% if the specular reflectance of the reflected beam of light to, then there is a 30W energy is absorbed into the heat, you can imagine, the role of 30W of power in 1 mm2, only micron thickness reflective surface, even if it is used as a reflective silver material has been vaporized, laser will be blocked after penetrating look at the mirror.
http://ameblo.jp/szq95910/entry-12152438131.html
Or laser pointer 2000mw active area of ??1 mm2, up to 97% if the specular reflection rate to the reflected beam of light, then there is 60W energy is absorbed into heat. Conversely, if the power is small, or the effect of a larger area of ??the reflecting mirror or by other methods have higher thermal conductivity, the reflection effect can be sustained.
Mirrors have damage threshold, there is a possibility of being broken. For example, laser pointer 200mw using high damage threshold of the mirror, the laser can be reflected off. The light reflected back to the laser, then the mirror as the equivalent of a mirror, the laser resonator has changed. Lasers can add some inside isolator for preventing reflected laser damage crystals.
By adjusting the length of laser pointer the different ways of adjusting the first mirror. It is in the right hand side of the photo, so the mobile frame for the same number of the pictures on the left (the back of the body) or at the center. Please adjust the center of the inner hole of the inner sleeve of the laser light path to the mirror. If the level of the center, adjust the frame angle. Just a slight angle will make a big move. So, it slowly adjust. Please adjust as the center. The original position of the laser on the use of the software. When the second mirror is too far away, it may be too far from the center, so give it a go near distance once again in the middle area of the Y axis side. Right Y axis before irradiation treatment area. Back to the original position, if it is too far from the middle of the frame, the adjusted angle. A little time to fix the angle of the screw in the mirror. Move the Y axis to adjust it, so there is no slip before the process domain of the different ways and the original point of the position. At the same time, by adjusting the vertical axis sliding adjusted the mirror base for adjusting screw, even if it is moving in the horizontal direction, you can also adjust the level of the horizontal direction angle adjustment, if it is so, the first reflector including aluminum frame to move together, aluminum frame parallel.
Wile pointing a laser beam at airplane cockpits can distract pilots, putting the crew and passengers at risk of harm, there is no evidence to suggest the beams can damage their eyesight. This is the conclusion of an editorial recently published in the British Journal of Ophthalmology.
[A red laser beam]
Laser pointers may not damage the eyesight of pilots, but they can distract them.
A laser pointer is a battery-powered, hand-held device - commonly in the form of a pen or key chain - that emits a low-powered laser beam.
In the US, the Food And Drug Administration (FDA) require that manufacturers limit the energy of laser for sale to 5 milliwatts (mW) or less.
While there are no specific laws for laser pointers in the UK, the country's Health Protection Agency recommend that the energy of laser pointers sold to the general public should be no more than 1 mW. Directing a laser pointer at an aircraft is illegal in both the US and UK, but it seems this does not deter some individuals from doing so.
According to the US Federal Aviation Administration (FAA), between January 1st and February 13th, 2016, there were 971 reports of laser pointers being directed at aircrafts - representing a 64% increase on 2015 figures for the same period.
And in the past 12 months, there have been more than 1,500 reports of laser pointers being directed at aircrafts in the UK. But how are pilots affected by laser pointers? Prof. John Marshall, of the Institute of Ophthalmology at University College London, UK, and colleagues outline the possible risks in a new editorial.
Aircraft height makes Ultra Powerful Laser Pointer 'incapable' of harming pilots' eyes
It is common knowledge that a laser pointer should not be directed into a person's eye; the radiation from the laser beam can cause damage to the retina, particularly if the beam is focused for prolonged periods.
However, in their editorial, Prof. Marshall and colleagues say that such damage can only occur at short range, noting that a laser beam shone from a long range - such as from the ground to an aircraft that is hundreds to thousands of meters in the sky - is "incapable" of causing irreversible harm to a pilot's eyesight.
They explain that the beam from a laser pointer has to pass through the atmosphere, as well as the pilot's windshield, in order to make direct contact with the eye. The authors note that there has only been one reported case of retinal damage to a pilot as a result of a laser pointer being directed at an aircraft.
The case referred to was reported in the journal Aerospace Medicine and Human Performance earlier this year, detailing how a male pilot suffered retinal laser burn after a blue laser beam was directed at his aircraft, which was around 1,300 ft (396 m) in the air.
However, Prof. Marshall and colleagues brand the case as "suspect," primarily due to how far away the aircraft was from the ground, which they say would significantly reduce the laser's impact on the eye.
Prof. Marshall and colleagues believe the current safety limits for laser pointer pen best buy do not need to be changed, which is contrary to views that have been expressed in the media.
Instead, they say there needs to be more focus on educating the public on the potential risks associated with laser pointers.
The authors also note that there are some unscrupulous laser pointer manufacturers that are selling devices that emit energy of up to 1,000 mW, which greatly exceeds safety limits.
The European Commission have asked the relevant bodies to set specific standards of consumer laser products, which the authors say should enable unsafe products to be removed from sale.
"However, compliance by manufacturers will remain an issue," they add, "as will direct imports by the public purchasing unsafe laser products over the Internet."