Abstract: In order to solve the problem that the laser output energy decreases when laser diode pump wavelength drifts with temperature, the technology of laser diode pump source wavelength matching and concave-convex stable resonator are used to realize temperature-free control. After theoretical analysis and experimental verification, the results show that, when the length of laser cavity is 210mm, electro-optic conversion efficiency is 5.7%. Output single pulse energy is more than 60mJ, and the energy stability is better than 5% in the range of 10℃~30℃. Laser output spot diameter is 4mm, pulse width is 8s, and laser far-field beam divergence angle is 1.1mrad at 10Hz. The experimental results are in agreement with the theoretical analysis. The laser diode side-pumped temperature-free laser can maintain a stable energy output in a certain temperature range. The theoretical analysis and the scheme are of great significance for the study on temperature-free-controlled lasers.