Scalable Acoustical Frequency Tagging Coherent Beam Combining Based on Digital Signal Processing

We present the module of booster amplifier for coherent beam combining Master Oscillator Power Amplifier (MOPA) system to operate with a text narrow-linewidth seed laser. The goal was to achieve a highly modular system, manifested in the ease of changing the number of Coherent Beam Combining (CBC) channels. It uses a frequency tagging phase control scheme performed at acoustical frequencies, enabling a simple piezo fiber stretcher as actuating and tagging element and a cheap microcontroller to perform all the signal processing. The text four-channel CBC system with the proposed booster module was built to verify our assumptions and the whole system’s performance.