An efficient but simple scheme of an axicon-based resonator for tuning the spatial mode of high-power and high-order Bessel–Gaussian beams is proposed. This scheme is extended for two types of high-power lasers: continuous wave (CW) and Q-switched lasers. More importantly, the right axicon apex angle, the resonator optical length and the internal aperture diameter and its place inside the resonator are theoretically deduced for adjusting the transverse mode order of the laser. Furthermore, high-power Bessel–Gaussian beams with both active and passive arrangements are set up. The experimental results verify the validity of the theoretical model and the accuracy of the selected parameters. In this paper, an effective guideline is presented for designing more efficient, more compact, and easier-to-fabricate sources of high-power and high-order Bessel–Gaussian beams with transverse mode tuning.

提出了一种有效且简单的基于轴锥的谐振器，用于调谐大功率和高阶贝塞尔-高斯光束的空间模式。该方案扩展到两种类型的高功率激光器：连续波（CW）和Q开关激光器。更重要的是，从理论上推导了直的轴锥顶角，谐振器的光学长度和内部孔径以及其在谐振器内部的位置，以调整激光器的横向模序。此外，还建立了具有主动和被动布置的大功率贝塞尔-高斯光束。实验结果验证了理论模型的有效性和所选参数的准确性。本文为设计更高效，更紧凑，