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 532nm 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.