CW DUV laser with improved stability
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United States of America Patent
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Aug 7, 2018
Grant Date -
Mar 9, 2017
app pub date -
Oct 26, 2016
filing date -
Jun 11, 2013
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Abstract
A deep ultra-violet (DUV) continuous wave (CW) laser includes a fundamental CW laser configured to generate a fundamental frequency with a corresponding wavelength between about 1 μm and 1.1 μm, a third harmonic generator module including one or more non-linear optical (NLO) crystals that generate a third harmonic and an optional second harmonic, and a fifth harmonic generator. The fifth harmonic generator module includes a cavity resonant at the fundamental frequency, and combines the fundamental frequency with the third harmonic in a first NLO crystal to generate a fourth harmonic, then combines the fourth harmonic with unconsumed fundamental frequency in a second NLO crystal to generate the fifth harmonic. One or more lenses are used to focus the third and fourth harmonics in the first and second NLO crystals, respectively.
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