Hole burning effect

Selective consumption effect of reversed particle number in activated substances.

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Laser is realized by stimulated radiation and mode selection of optical cavity. Good monochromaticity, good coherence, good directivity and high brightness. Laser usually works in multimode oscillation state, which is characterized by multimode transverse oscillation in space and multi-frequency component oscillation in longitudinal direction. The gain saturation effect of medium includes the gain saturation effect of uniform broadening and the gain saturation effect of non-uniform broadening, which affect the output laser of laser. The laser with uniform broadening and stability should be a single longitudinal mode output, but when the laser is strong, multi-longitudinal mode oscillation will occur. The stronger the laser, the more oscillation modes. When the longitudinal mode with frequency produces stable oscillation in the cavity, a standing wave field will be formed in the cavity, with the maximum light intensity at the antinode and the minimum light intensity at the node. The average gain coefficient of the mode varying with frequency is 0, but the number density and gain coefficient of inversion particles at each point in the axial direction are different, and the gain coefficient is the smallest at the antinode and the largest at the node, which is the spatial hole-burning effect of gain.

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