This kind of packing of laser pointer is the most appropriate

This kind of packing of laser pointer is the most appropriate.laser pointer Used in Teaching
The catalog of laser pointer needs to be revised. Distinguished by the working medium, there are solid-state lasers, liquid lasers and molecular, ionic, excimer lasers and other types of gas. Meanwhile, according to their firing position can be divided into space-based, land-based, shipboard, and airborne and other types of vehicle, its use can be divided into two types of tactical and strategic type. Tactical laser weapons is the use of lasers as energy, like conventional weapons, as the direct killing enemy personnel, destroy tanks, aircraft, combat is generally up to 20 km distance. The main representatives of such weapons and laser guns, laser guns, they can send a strong laser beam to strike the enemy. In March 1978, the world's first laser guns in the United States was born. Laser gun style not much different from ordinary rifle, mainly consists of four major components: laser, actuator, firing devices and rifle butts. The laser pointer company will establish a joint venture of laser pointer . 
The main purpose of the early important technology is to accurately measure the various atomic parameters for high-resolution ultra-high-precision laser spectroscopy and quantum frequency standards (atomic clocks), but later became achieve atomic Bose - Einstein condensation of the key experimental methods. Although the early 20th century, people have noticed the light right there Fushe atomic pressure, but after the invention of the laser, before developing the use of light pressure to change the speed of atomic technology. It was found that when the atoms in the atomic transition frequency is slightly lower than the energy gap and a pair of opposite laser beam propagation in the movement, due to the Doppler effect, atomic absorption and atomic motion tends to the opposite direction of the photon, while the direction of the road with the same less likely to absorb photons; absorption of photons to be isotropic spontaneous emission. It seems equally, the net effect of two laser beams is to produce an atomic motion in the opposite direction of the damping force, so that the slow movement of atoms (ie, cool). The personnel responsibility of laser pointer is good for the development of laser pointer company.Output of the laser light, the wavelength distribution is very narrow, so very pure color. The output of red helium-neon laser, for example, the wavelength of the light distribution can be narrow to 2 × 10 ^ -9 nm krypton lamp emits a red light wavelength distribution of the two ten thousandths. Thus, the laser is far more than any kind of monochromatic monochromatic light source. In addition, there are other characteristics of the laser: coherent and good.