Deformed beam structures of Lissajous transverse patterns induced under high-power pumping were explored in an off-axis pumped Nd:YVO4 Laser within a degenerate cavity configuration. Experimental results show that beam structure variations including elongation, rotation and vagueness will occur with increasing pump power. Considering crystal axis rotation of gain medium induced by the inhomogeneous temperature gradient under high-power pumping, the derived resonant wave function of the spherical cavity can well reconstruct the experimental observation to further give an explicit relation between the tilt angle and aspect ratio of Lissajous patterns. It is believed that this finding can provide helpful information for the research on high-power structured light.
Beam structure stabilization for the high-power structured modes with transverse patterns as Lissajous figures created by an off-axis pumped degenerate-cavity laser is explored. Through the employment of a YVO4/Nd:YVO4 composite gain crystal with the front undoped segment as an effective heat spreader, it has been experimentally verified that not only the mode stability and purity of the generated Lissajous beams are significantly improved but the output power efficiency is obviously enhanced. With superior mitigation ability against the thermal aberration under high-power pumping, the proposed scheme of using the composite gain crystal to replace conventional uniformly doped crystal can offer a promising solution to realize high-power, high-order structured beams with excellent beam stability.
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