Podcast Summary: In this podcast, Dr. Ghani discusses laser physics and technical parameters for ureteroscopic lithotripsy. I cover the basics of the holmium laser system, characteristics of the HoYAG pulse waveform, peak power and peak power density, and implications for stone fragmentation and efficiency when considering pulse duration, pulse energy, pulse frequency, pulse modulation, total power, and fiber to stone working distance. The relationship between material and fluid absorption, and how this affects safety parameters of intrarenal pressure and heat generation are also discussed.