Abstract
A new higher harmonics monitor system for a large-scale laser fusion test facility has been designed and tested. Critical requirements for the monitor are the automatic measurement by CPU control and the separation of incident and reflected laser pulses which propagate backward along laser axis with a time difference of several ns. Fast AD converter with a fast gate is used for the separation of the two pulses. It has been demonstrated experimentally at the recently developed GEKKO XII glass laser system that each two 1 ns laser pulses with a time difference of 5 ns can be easily measured (diagnosed) by the monitor. Laser-pattern-independent monitoring is realized by using a diffuser plate in a focusing section of the monitor. Use of the diffuser plate also reduces greatly the required accuracy for the monitor alignment.
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