Enhanced Loading of ^40K from Natural Abundance Potassium Source with a High Performance 2D^+ MOT

^40K is one of the most important atomic species for ultra-cold atomic physics. Due to the extremely low concentration (0.012%) of ^40K in natural abundance of potassium, most experiments use 4–10% enriched potassium source, which have greatly suffered from the extremely low annual production and significant price hikes in recent years. Using naturally abundant potassium source, we capture 5.4\times10^6 cold ^40K atoms with the help of a high performance of two-dimensional magneto-optical trap (2D^+ MOT), which is almost three orders of magnitude greater than previous results without the 2D^+ MOT. The number of the ^40K atoms is sufficient for most ultra-cold ^40K experiments, and our approach provides an ideal alternative for the field.