Development of a 423-nm single-frequency high-power diode laser system for 48Ca isotope separation (Invited Paper)

We present a novel laser isotope separation (LIS) system using a 423-nm single-frequency diode laser based on gallium nitride (GaN) for enriching 48Ca, essential for neutrinoless double beta decay studies. This system features 23 injection-locked lasers, achieving over 2 watts of power, crucial for matching the narrow isotope shift of 48Ca. Utilizing the Pound-Drever-Hall technique for frequency stabilization, we maintain a relative frequency variation below 1 MHz rms, demonstrating the system’s potential for precise and scalable isotope separation. This advancement offers a significant leap toward practical large-scale applications of LIS in scientific research.