Generation of quasi-CW deep ultraviolet light below 200 nm by two successive cavity enhanced second harmonic generators

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  • Generation of quasi CW deep ultraviolet light below 200 nm by two successive cavity enhanced second harmonic generators

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<jats:p>By frequency quadrupling a picosecond pulse train from a Ti: Sapphire laser with a wavelength of 798 nm and a repetition rate of 82 MHz, we generated a coherent deep ultraviolet light below 200 nm. Two frequency-doubling stages take place in resonant cavities that can increase conversion efficiency. This allows an overall efficiency of 4.3% and produces an output power of up to 60 mW. In the second stage, in which a KBe<jats:sub>2</jats:sub>BO<jats:sub>3</jats:sub>F<jats:sub>2</jats:sub>(KBBF) crystal was employed as a nonlinear medium, conversion efficiency is increased by about three times compared with that of the single-pass configuration. Taking into account reflective loss, conversion efficiency is improved five times.</jats:p>

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