green laser pointer is used in the open air

Here will show the repair or commission of green laser pointer
Therefore, power can be high, the highest peak power of up to GW order of magnitude, average power megawatt order of magnitude. Livermore National Laboratory in 1986 in the FEL device 1GW peak

laser power, once as high as the peak power of 1.7GW of energy of the electron beam into the laser efficiency reached 43% [5]. At present, technically to manufacture high-power electron accelerator

is not very difficult matter, so to achieve high-power free-electron laser in principle is not a problem. High laser efficiency. Atom laser, the interaction between the electron beam and the laser

did not produce the energy dissipation process, converted to laser energy, the rest is still stored in the electron beam. 200mW green laser pointer can burn the match more quickly.
Wiggler interaction time, the electron beam energy is converted to laser efficiency is not high, but can be recovered from the wiggler electron beam energy, which can achieve the purpose of

increasing efficiency. The free electron laser has the incomparable advantage of ordinary laser, so it has broad application prospects. The free-electron laser in addition to have important

applications in the military field, have potential applications in the field of laser fusion, biomedical, materials science, plasma research, photochemistry, laser spectroscopy. Dynamics of free-

electron laser at home and abroad. Since the birth of the world's first laser in 1960. Where the light of green laser pointer is not very strong.
With the research and development of laser technology, it is generally ordinary laser power, efficiency, and wavelength tuning range can have dramatically improved, but for ordinary laser is simply

difficult to do, so scientists have begun to explore new ways new ways to improve laser performance. Back in the early 1950s, it was suggested that the idea of a free electron stimulated emission.

1950, it was a straight line with RF acceleration and swing the visible wavelength of spontaneous emission and microwave coherent radiation. From 1957 to 1964, the advent of free-electron maser.

The same time, the use of transverse cyclotron motion of energetic electrons in the axial magnetic field to generate millimeter-wave, but until 1974 was the first time in the millimeter-wave

stimulated emission [9]. green laser pointer is used in the open air.