使用Nd：YVO4微芯片的自差和外差laser干涉测量的实验比较laser
Experimental comparison of autodyne and heterodyne laser interferometry using a Nd:YVO4 microchip laser
摘要：
利用弛豫频率在兆赫范围内的Nd：YVO_4微片激光器，对基于迈克尔逊结构的外差干涉仪和基于激光光学反馈成像（LOFI）方法的自差干涉仪的信噪比进行了实验比较。在外差配置中，参考光束和信号光束之间的拍频是在激光腔外部实现的，而在自差配置中，波拍频发生在激光腔内部，并且激光强度的弛豫振荡然后起重要作用。对于给定的激光输出功率，调查对象和检测噪声水平，我们已经确定的放大增益的LOFI干涉仪相比，外差干涉仪。LOFI干涉法被证明比外差干涉法表现出更高的性能，为广泛的激光功率和检测水平的噪声。实验结果与理论预测吻合较好。
英文摘要：
Using a Nd:YVO4 microchip laser with a relaxation frequency in the megahertz range, we have experimentally compared a heterodyne interferometer based on a Michelson configuration with an autodyne interferometer based on the laser optical feedback imaging (LOFI) method regarding their signal to noise ratios. In the heterodyne configuration, the beating between the reference beam and the signal beam is realized outside the laser cavity while in the autodyne configuration, the wave beating takes place inside the laser cavity and the relaxation oscillations of the laser intensity then play an important part. For a given laser output power, object under investigation and detection noise level, we have determined the amplification gain of the LOFI interferometer compared to the heterodyne interferometer. LOFI interferometry is demonstrated to show higher performances than heterodyne interferometry for a wide range of laser power and detection level of noise. The experimental results are in good agreement with the theoretical predictions.
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