The results show that, the variation of the maximum intensity and the pulse width (full width at half maximum (FWHM)) of the third harmonic field with the length of the crystal is not obvious.

• 研究结果表明：入射基频光强一定时，三倍频光的峰值光强、脉冲宽度(FWHM)随晶体厚度变化不明显。