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Two significant coherent combining solid state laser systems will be described. One approach uses a fiber optic amplifier array and the other uses 7 tiled slab amplifier chains. The first of these demonstrated very high efficiency and near perfect beam quality. The 2nd of these approaches reached a world record 105 kW of power CW.
We have maintained Langmuir-Child bipolar flow at a peak voltage of 650 kV in a vacuum diode for 1 ??s without gap closure or electrical breakdown of the diode insulator. An ion current of > 300 A (> 7.5 A/cm2) was extracted from the diode in a beam having a large component of divergence < 10-2 rad.
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