用超声光栅测量氦氖激光的波长  

The measurement of laser wavelength by ultrasonic grating

作　　者：杨燕婷[1] 王敏[1] 周誉昌[1] 

机构地区：[1]广东工业大学实验教学部,广东广州510006

出　　处：《大学物理》2009年第7期43-44,52,共3页College Physics

摘　　要：介绍了一种新的测量激光波长的方法,并与传统的迈克耳孙干涉仪测量的结果进行了比较.我们对汞光和氦氖激光在乙醇(97%)形成的超声光栅中的衍射光谱进行了测量研究,首先利用汞光数据计算得到了超声波在乙醇中的传播速度,并分析了温度对结果的影响,然后利用超声波波速计算了氦氖激光的波长,得到的结果与标准值相比的相对误差为0.55%.此方法操作简便,且有与迈克耳孙干涉仪可比的精度.A new method is presented for measuring the laser wavelength. The experimental results are compared with those obtained by the classical Michelson interferometry. We analyze the diffraction spectra of the ultrasonic grating formed by mercury and He-Ne lasers through ethanol solution （97%）. We study further the effect of temperature on the velocity of ultrasonic wave propagation that is first measured using mercury laser. The wavelength of He-Ne laser can be accordingly calculated from the velocity of ultrasonic wave propagation. The relative error between the calculated and the standard values is 0.55%. The new method is comparable to the classical Michelson interferometry.

关 键 词：超声光栅 声速 氦氖激光 

分 类 号：O433[机械工程—光学工程]