激光诱导碘荧光(LIIF)强度与激发激光波长的关系

Dependence of Intensity of Laser Induced Iodine Fluorescence(LIIF) versus Exciting Laser Wavelength

理论上简要地分析了在可见光波段碘荧光强度与激发激光波长的关系 ,并用波长为 5 32nm半导体倍频Nd :YAG激光、波长为 5 14 .5nm、5 0 1.7nm、4 96 .5nm和 4 88nm的氩离子激光激发碘分子 ,通过对获得的荧光信号分析得出 ,五种波长的激光均可诱导出碘荧光。对相同的激光功率 ,波长为 5 32nm的倍频Nd :YAG诱导出的碘荧光信号比波长为 5 14 .5nm的氩离子激光强 ,两种激光均可作为碘气体的激发激光。其它三种波长激光诱导出碘荧光强度弱 ,在激发激光传输方向衰减明显 ,不适合作为碘荧光的激发激光。

The dependence of intensity of laser induced iodine fluorescence (LIIF) versus the exciting laser wavelength was theoretically analyzed. In the experiment,the exciting lasers' wavelengths were 532nm、514.5nm、501.7nm、496.5nm and 488nm. The result indicated that each of the five wavelength lasers can induce the iodine fluorescence. In the same condition,the fluorescence's intensity induced by 532nm laser is higher than that induced by 514.5nm laser,these two wavelength lasers are good exciting lasers for iodine fluorescence. The signals induced by the other three lasers are very weak,and decay very quickly along the direction of the exciting laser,thus these three lasers are not fit to be used as the exciting lasers of LIIF.