Nd: Glass Amplifier with Repetition Rate Fabricated by Flash-Lamp Pumping and Liquid Cooling Method

A repetition rate laser amplifier is the key component of a repetition rate laser; here, the repetition rate of the amplifier is determined by precisely controlling the heat produced during pumping and amplifying. To achieve a repetition rate laser exhibiting kilojoule output energy, a repetition rate laser amplifier prototype with a diameter of 130 mm is developed based on flash-lamp pumping, a neodymium glass gain medium, and liquid cooling. After ensuring the rational mechanical design and selecting a coolant with suitable properties, the developed amplifier prototype operates at 1 shot per minute and exhibits a double pass small signal gain of 1.3189. At 1053 nm, the PV (peak to valley) of 10-shot average double pass wavefronts for the amplifier prototype arc 0. 2718 lambda and 0. 3223 lambda when the temperatures of coolant arc 20 degrees C. and 30 degrees C., respectively.