Chronicle of direct pumping
To tell the truth, the invention of laser diode is aimed for the pump
source of direct-pumped Nd-doped lasers, and there are many early works.
However, their conclusion this choice was not convinient and flash lamps
had been considered to be suitable for the pump source of Nd-doped
lasers. After developing of laser diode pumped solid-state lasers, the
direct pumping technology have neen attracted again. In 2003, we
reached current world records of the laser efficiency in Nd-doped