Abstract
A side-pumped Nd:YAG amplifier that can realize amplification and beam shaping simultaneously is reported. As a typical application, a Gaussian intensity profile of signal laser was amplified and converted into a flat-top distribution. The main parameters satisfying this requirement involved structural designation and optical parameters adjustment of the pumping laser diode LD, to obtain a specific gain distribution on cross section of the working material. Among them the key considerations include central wavelength of LDs and pumping radius to the centre of Nd:YAG rod. Take an example of 15mm-dameter Nd:YAG side-pumped rod amplifier, where 13.5kW laser diode bars were used, we simulated an uniform flat top laser profile by ray-tracing method. The following experiment shows a good agreement with the simulation. Moreover, gradual absorption coefficient of the working material could also be well compensated while realizing flat-top beam to flat-top beam amplification.
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