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
Original Manuscript: May 10, 1979
Published: September 1, 1979
K. M. Baird, K. M. Evenson, G. R. Hanes, D. A. Jennings, and F. R. Petersen, "Extension of absolute-frequency measurements to the visible: frequencies of ten hyperfine components of iodine," Opt. Lett. 4, 263-264 (1979)