参考谱线法测量倍频Nd:YAG激光器调谐波长的研究

为了精确测量倍频Nd:YAG激光器的调谐波长,采用碘分子在532nm附近的强吸收谱线作为频率稳定的绝对参考谱线,建立了以碘蒸气为标定物的激光调谐波长测定系统,实际测量了碘蒸气吸收谱线.通过谱线的特征结构与理论吸收谱线的比较,得到了倍频Nd:YAG激光器调谐频率与外加偏压及电位计旋转角度的对应关系,并确定了激光频率跳变点的位置,最后给出了倍频Nd:YAG激光器的调谐范围.结果表明,碘吸收谱线法可以用来精确测量倍频Nd:YAG激光器的调谐波长.

Measurement of Tuning Wavelength of Frequency-doubled Nd:YAG Laser by means of Reference Spectrum

In order to measure the tuning wavelength of a frequency-doubled Nd:YAG laser, strong absorption lines of molecular iodine near 532 nm was adopted to provide the absolute reference for frequency stabilization. The experiment system for measuring wavelength was built up with iodine vapor as reference, and the iodine vapor absorption lines were measured. Compared with the computed absorption lines, the relations between laser tuning frequency and voltage, laser tuning frequency and rotary angle of potentiometer were obtained, the mode hop was found, and the tuning range of frequency-doubled Nd:YAG laser was measured. The results show that it is a suitable method for measuring tuning wavelength of frequency-doubled Nd:YAG laser by means of iodine vapor absorption lines.