Abstract
The effect of the combined guiding, the thermal induced guiding and gain guiding, on the beam quality in Nd:YVO 4 MOPA laser is studied experimentally and theoretically. The beam quality enhancement is achieved during the power-amplification process in a 4-amplifier-stage Nd:YVO 4 MOPA laser. 195 W TEM 00 mode laser is achieved while its beam quality enhanced from M 2 =3.0 to 1.2 after power amplification. This is an interesting phenomenon since the beam quality is always deteriorated during the laser amplification. To explain the phenomenon of beam quality improvement, a theoretical model is established with the thermal induced guiding effect and gain guiding effect is considered, and a nonlinear dynamical equation of the laser mode in laser amplifier is derived. The wave equation is a Schrodinger-like two order nonlinear partial differential equation, and a symmetrical split-step Fourier mothed is developed to analyze the wave equation. Both experimental and theoretical results show that the combined guiding effect dominates the evolution of beam quality in the insensitive pumping Nd:YVO 4 MOPA lasers, and the combined guiding effect can be employed to improve the performance of beam quality in MOPA lasers.
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