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| A new method for measuring laser wavelength based on acousticoptic diffraction |
| XU Qiaoping |
| College of Physics and Electronic Information,Yan′an University, Yan′an 716000, China |
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Abstract 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.
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Received: 12 October 2021
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2022, Vol. 40 
