介绍了一种新的测量激光波长的方法。在室温条件下，利用压电陶瓷片在高频信号源产生交变电场作用下获得超声波，超声波在液体中传播形成超声光栅。在光具座上利用准直透镜和测微目镜组成的望远系统替代了分光计，完成了对在已知波长钠光、未知波长激光的照射下形成了光栅光谱宽度的测量，并结合光栅方程，得出激光的波长。该方法原理简单，结果与激光波长标定值的相对误差小，可以作为超声光栅的一个扩展试验。

This paper presented a new method for the measurement of laser wavelength. At room temperature, the ultrasonic wave was obtained using piezoelectric ceramic chip under the action of alternating electric field generated by high frequency signal source. Ultrasonic grating was formed using the propagation of ultrasonic wave in liquid. The spectrometer was replaced by a telescope system composed of a collimating lens and a micrometer eyepiece. The measurement of the spectral width of grating formed under the irradiation of sodium light with known wavelength and laser with unknown wavelength was completed. Combined with the grating equation, the wavelength of laser could be obtained. The principle of this method was simple, and the relative error between the measured result and the calibration value of laser wavelength was small. It could be used as an extended experiment of ultrasonic grating.