Picosecond pulse bursts generated by an Yb-doped fiber laser are further amplified up to the mJ level in an Nd-doped vanadate amplifier. Highly efficient frequency tripling (38%) and quadrupling (23%) in lithium triborate crystals is shown to yield near diffraction-limited beam quality (M2 < 1.2).

© 2015 Optical Society of America

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