Looking for a new light source,especially short-wavelength coherent light source has attracted much attention.A possibility and basic conditions are discussed by using crystalline undulator field radiation as a short-wavelength laser;it is pointed out that the short-wavelength laser has not yet been available so far which is due to not only technical reasons,but also physical reasons.In this paper,the physical problem is analyzed by using parametric excitation method.Introducing the sine-squared potential,t...
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