Abstract
The energy efficiency of many nonlinear optical processes, such as Raman conversion, may be enhanced by increasing the peak intensity of the driving laser. For lasers with storage times τ long compared to the pump duration T, extraction of the stored energy with a relatively short-duration tP optical pulse may result in a large-intensity enhancement with good energy efficiency. For excimer lasers, storage times (τ ≈ 4 ns) are typically shorter than the pump duration (T ≈ 20 ns) making energy extraction in a single pulse whose duration tp is short compared to τ and T rather inefficient. We show that intensity enhancement with good energy efficiency is still possible in KrF excimer lasers if trains of short-duration pulses are used. This method relies on the recovery of the gain between pulses to provide extractable energy for each successive pulse In the train.
© 1988 Optical Society of America
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