Choi H., La J., Park K.

There are several methods for the heterodyne laser source generation. The method using the Zeeman effect is frequently used due to the simple construction and the small loss of a light. However, the low beat frequency of the laser in the zeeman method limits the velocity measurement. In this article, an electronical frequency modulation algorithm is proposed to overcome the drawback of the low velocity measurement capability by increasing the beat frequency electronically. The brief analysis, the measurement scheme of the proposed algorithm, and the experimental results are presented. It is demonstrated that the proposed algorithm is proven to enhance the measurable velocity limit.