Abstract
Direct-frequency measurements have been extended into the visible region of the electromagnetic spectrum. The visible frequencies were synthesized by generating the second harmonic of the recently measured 260-THz 20Ne, 1.15-μm laser with a LiNbO3 crystal. The absolute frequencies of ten hyperfine components of 127I2 near 520 THz are reported.
© 1979 Optical Society of America
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