Abstract: This paper deals with the law of the threshold, oscillating modes, slope efficiency and the beam quality varying with the pumping position under the condition of the off-axis pumping. The results prove that the threshold, the slope efficiency and the factor of the beam quality become higher and the laser mode changes from the high order to the low order Hermite-Gaussian mode as the Δx departs from the axis. At the same pumping position, the laser mode changes from the high order to the low order Hermite-Gaussian mode because of the heat domino effect becoming prominent as the LD current increase.

Key words: laser diode, end-pumping solid-state laser, threshold power, beams quality