Abstract
Image relaying in a high-average-power slab laser system, especially one with thermal lenses, was studied.Ray-trace analysis using an ABCD matrix was conducted for a multi-cascade relaying system. The analysisclarified quantitatively the beam expansion, the focal shift and the power loss by thermal lenses that should betaken into account in the system design. An Nd: YAG slab laser system was developed, and its beam wasrelayed successfully by careful design, taking the above considerations into account. The laser system demonstratedan average power of 235 W with a high beam quality.
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