High power second harmonic generation of 257 nm radiation in an external ring cavity

Abstract Continuous wave high power frequency doubling of a stabilized, single mode argon ion laser in a resonant external ring cavity is discussed and experimental results are presented. The second harmonic is generated in a Brewster cut ADP crystal which is 90° temperature phase matched. Greater than 80 millwattts of stable, usable radiation at 257 nm is generated. Successful operation of the ring cavity with an internal harmonic beamsplitter to extract the UV radiation is reported.

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