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Compact diode stack end pumped Nd : YAG amplifier using core doped ceramics

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Abstract

We report on a compact Nd:YAG amplifier emitting a maximum pulse energy of 14mJ. By amplifying a passively Q-switched oscillator (M2<1.2) a good beam quality of M21.7 was achieved. The amplifier is diode pumped by an 8 bar diode stack of 800W power and a nonimaging optic. This optic homogenizes the pump light and transfers it into a 5mm diameter core doped rod with a centrally neodymium doped region of 3mm and a samarium doped YAG cladding. We show that this cladding reduces parasitic effects in the laser rod compared to an undoped YAG cladding. Finally, we compare the compact amplifier with an amplifier, which is mode selectively pumped by a fiber coupled pump diode.

© 2010 Optical Society of America

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