Abstract

We describe a next-generation monoblock laser capable of a greater than 10  mJ, 1.5μm output at 10  pulses/s  (pps) over broad ambient temperature extremes with no active temperature control. The transmitter design is based on a Nd:YAG laser with a Cr4+ passive Q switch and intracavity potassium titanyl phosphate optical parametric oscillator. To achieve the repetition rate and efficiency goals of this effort, but still have wide temperature capability, the Nd:YAG slab is end pumped with a 12-bar stack of 100  W (each) diode bars. Different techniques for focusing the pump radiation into the 4.25  mm×4 .25   mm end of the slab are compared, including a lensed design, a reflective concentrator, and a lens duct. A wide temperature operation (−20 °C to 50 °C) for each end-pumped configuration is demonstrated.

© 2006 Optical Society of America

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