laser
LASER, or laser laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, laser, Features are excellent monochrome, divergence is very small, brightness (power) can be very high. Generating the laser requires "excitation source", "gain medium", "resonance structure" of these three elements. ...