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        the most common liquid laser dye laser (dye laser). Using flash or other laser excitation of a dye solution, from S0 to S1, or S0 to S2, can order transitions. The relaxation process is reduced from S1 to S0 the vibration rotation energy level, can emit laser light. Because the rotational energy level of each vibration is very dense, produces laser light covers a range of wavelengths. If the use of a grating in the cavity (grating) can reach continued modulated laser wavelengths of light. The changes of different dyes, can produce different band tunable laser light.

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