Abstract-Direct Frequency Measurement of the 260 THz (1.15 μm) 20Ne Laser: And Beyond

D. A. Jennings, F. R. Petersen, K. M. Evenson,

https://link.springer.com/chapter/10.1007/978-3-540-38950-7_5

Absolute frequency measurement has been extended to the visible spectrum with the measurement of the strong 1.15 μm laser line in 20Ne at 260 THz and lines in iodine at twice this frequency. The 260 THz frequency was synthesized in nonlinear crystals of CdGeAs2 and AgAsS3 from stabilized CO2 lasers and the 1.5 μm laser line in 20Ne. The visible frequencies were synthesized by generating the second harmonic of the 260 THz radiation with a LiNb03crystal. The absolute frequencies of ten hyperfine components of 127I2 near 520 THz were measured.