Laser diode pumped Nd:YVO₄ laser generating quasi-non-diffracting green beam by passive axicon

Laser diode pumped Nd:YVO4 laser is used as light source. Green beam whose wavelength is 532 nm is generated by frequency doubling through KTP. The quasi-non-diffracting Bessel green beam is obtained by axicon. The distribution of the green beam light field is deduced. The intensity distribution along the propagation distance and the cross-section intensity distribution of the quasi-non-diffracting Bessel green beam are simulated. In experiment, the cross-section light field distribution of Bessel green beam at different distance from axicon are recorded and the propagation distance of non-diffracting beam and the diameter of center light spot are measured. The experimental data agree well with the theoretical simulation. The experimental results demonstrate the quasi-non-diffracting Bessel green beam has good quality and is appropriate for applying.