Making the second section undulator of optical klystron resonant with the higher harmonic of the laser, the harmonic emission can be enhanced.

使光学速调管第二段波动器的磁场参数与光场的高次谐波共振，与对称光学速调管情况相比，可使产生的相干谐波辐射强度提高。

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Spontaneous emission can be totally suppressed or strongly enhanced depending on the relative position of the resonant frequency from the edge of the photonic band gap and the photonic mode density.

通过原子上能级与光子频率带隙边缘的相对位置或者光子态密度，可以抑制或增强原子的自发辐射。

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The double-barrier light emission tunnel junctions have been fabricated. The characteristics of electronic resonant tunneling with the junctions have been analyzed.

制备了含两层绝缘层的双势垒结构隧道发光结，介绍了其结构特点，分析了电子在结中的共振隧穿特性。

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