Coherent Beam Combining with Two Independent Lasers and Frequency Stabilization

Abstract

Lasers possessing high coherence and narrow spectral line width have low output power. Coherent beam combining (CBC) is a method for generating a high-power laser, whilst maintaining coherence. However, the technology is not easily available to non-professional users and a new approach is required. The interference signal generated due to the interference between two independent lasers was observed and a frequency stabilization system using the absorption of ammonia was constructed. Beat frequency was stabilized to 3.9 MHz which was less than the spectral linewidth of the laser light and suggests that the frequency condition for CBC is satisfied.