On the spot, if you hit directly on the surface of an object, you can see a circle around the spot in concentric (or eccentric) interference fringes, conditional friend can try. Power, light and laser wavelength, a relationship model, if the power is low, the military laser model and difference the interference fringes, may not be able to see, in addition to the object showed diffuse severe, may be the main question pattern.
Mainly because the military laser in the rough surface (smooth surface or so-called relative light wavelength is rough… ) diffuse reflection beam at the direction of the eyes, which interfere with each other, forming the particles. In addition to dust, air flow, temperature difference caused by optical path in to occur subtle changes, so these particles are constantly shaking.
Longitudinal mode refers to the form of military laser standing wave resonator is not formed in the same cavity! There will be a lot of wave forms, because meet cavity phase matching condition has a lot of, as long as the conditions can form a stable standing wave meet, a standing wave type corresponds to a longitudinal mode!
Transverse mode refers to the military laser field (including electric field and magnetic field) distribution in the cross section perpendicular to the laser propagation direction on the simple understanding of the field in the face of what! For example the base mode and its distribution in the cross section is a spot, there are a number of high order modes the spot in the cross section!
Military laser color and the use of the environment, light is reflected in the air particles, close observation of light can be seen a large number of particles, the daily environmental air quality even under good circumstances will produce. But it is sensitive to green eye visibility, so as long as the green laser 532nm 100mW (0.1W) in the daytime can produce indoor clear light.
Military laser can also have not visible, so a lot of the poor visibility, such as partial UV 405nm even 1W light power is not so obvious (even if the power can burn paper). Infrared laser welding of carbon dioxide, but also do not see the light 35W (can burn the carton)
These small military laser devices do not have a “buzzing” sound, the normal equipment of small power does not produce the current sound, if you’re curious can buy a large power laser pen; but please Caution!, this can see the visible light laser power can easily reach permanent the impact and damage the retinal aviation safety, must not be irradiated human or animal and spacecraft.
Lithography technology does not seem to be required in military laser. laser photon transitions of atomic / molecular release. The excimer laser and the ultraviolet light source, atoms, molecules have been excited into a plasma state, we don’t usually identified “excited state”, is from the outside level transitions to the ground state, said it is also not what laser, error.
A lot of medical military laser is not CW, is the pulse (also basically adjustable Q), this laser has not sound great energy (if I say a few joules you don’t think much of it, a hair dryer for a second, but it a few hundred joules) because of this kind of laser crystal the laser usually comes from the large volume, with the high quality of HR and OC, are generally single, and because of the choice of the crystal spectra with very narrow, very easy to focus, and long pulse mode pulse in 100 uS level, once with Q-Switch, can be easily compressed to dozens of nS level, so in fact, with pulse power very very big.
Military laser usually work continuously, the power is constant, the smaller; a lot of medical laser usually modulated Q pulse, single pulse energy is not large, but the peak power is great.
If military laser does not work but medical pulse continuous work, probably will become pork rather than treatment, imagine the need to target the same energy, if the power is small (note that this is a much smaller magnitude), irradiation time, heat diffusion into the surrounding tissue, what is not pork?
Military laser training system started early in the last century in 80s in the people’s Liberation Army military training system application in popularity now than it may. Originally not news. But if the existing laser training system have more clear improvement in detail, then certainly is in the news. The landlord gives more details before. Or are the original source, can not answer this question.