Abstract
Tuning the sum of a dye laser frequency ω L and its second harmonic ω DL to approach the two-photon resonance frequency of the 3s4d 1D or 3s5s 1S state of magnesium, strong uv coherent radiations at 202.6 nm, 199.2 nm and 211.4 nm have been generated effectively by four-wave mixing. Comparison was made between two-photon resonance with different frequencies, and with the same frequency. The factors limiting uv generation were studied.
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