Table 1.

Characteristics of two generators: Holmium:YAG laser and Thulium fiber laser

Parameter	Holmium:YAG laser (Lumenis Pulse 120H)	Thulium fiber laser (IPG Medical, Superpulse)
Wavelength	2120 nm	1940 nm
Pulse energy range	0.2–6.0 J	0.025–6.0 J
Pulse duration range	0.05–1 ms	0.05–12 ms
Pulse shape	Dictated by the pumping pulse	Electronically modulated
Maximum pulse frequency	120 Hz	2000 Hz
Maximum average power	120 W	60 W
Lowest proximal laser fiber core diameter	≥ 200 µm	≥ 150 µm
Cooling system	Low-power generators: self-contained water-cooling system with fan High-power generators: vapor-compression refrigeration system	Fan
Resistance to external shocks	Low	High