Can be stimulated in the stimulated emission of radiation and transitions: stimulated emission and stimulated emission class E2 transition frequency v of the atoms in the radiation field, the transition to a low-energy state E1 and radiation photon energy hv. Stimulated radiative transition into light waves emitted by the stimulated emission. (5) inversion: in the non-thermal equilibrium, energy level is greater than the population on low-level set of populations, known as the population on the anti-inversion: the number of anti-particles around (inversion). (6) self-oscillation conditions: small signal gain coefficient g0 loss greater than or equal to include amplifiers and cavity loss in the self-excited oscillation conditions: self-oscillation conditions the average loss factor α (7) The main characteristics of the led flash light: spatial coherence and direction, temporal coherence and monochromaticity, high brightness (strong coherent laser main features: the main characteristics of laser light) 3.To choose a perfect green laser pointer people should firstly check out by its appearance. In order to make helium-neon laser coherence length of 1KM, it should be the number of monochromatic ?
People should buy a green laser pointer with perfect stability. According to the small signal gain factor concept: g 0 = In the case of small-signal gain, the above equation can be obtained by integration: A Glossary and essays for a longitudinal cavity mode spacing and the expression of two adjacent longitudinal modes of the frequency difference △ vq called the longitudinal mode spacing. (L ‘of the optical cavity length) (2) the type of optical cavity loss type geometric loss of light deflection cavity loss, diffraction loss, incomplete endoscopic reflection loss caused by the material in the non-activated absorption, scattering, etc.
5 Since the reproduction mode to begin to speak from the reproduction mode on the mirror can be reproduced by a departure from the stable field distribution formed and began the phenomenon known as self-reproduction mode. 6 square mirrors on the fundamental mode amplitude distribution of the expressions in the mirror and characteristics of square mirrors on the fundamental mode amplitude distribution of the expressions in the mirror and characteristics of the field distribution function TEM00: fundamental mode amplitude from the lens center to the edge of the smooth landing. Select the green laser pointer by checking if the receiver of it contacts well.
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