Abstract

A CO₂-pumped far-infrared (FIR) laser has been used to drive transitions between S and P levels of ⁴He Rydberg states with the same principal quantum number (n). The levels are tuned to resonance with the fixed-frequency FIR laser through application of an intense magnetic field. Measurements of such transitions are particularly valuable as they provide high-resolution data for low L states, a previously ill-defined area in the otherwise well-known energy-level structure of ⁴He.

© 1981 Optical Society of America

Continuous-wave Stark far-infrared lasing lines in ¹⁵NH₃ optically pumped by a CO₂ or N₂O laser

C. Gastaud, A. Sentz, M. Redon, and M. Fourrier
Opt. Lett. 6(9) 449-451 (1981)

Ultrahigh-resolution spectroscopy and frequency standards in the microwave and far-infrared regions using optical lasers

J. E. Thomas, S. Ezekiel, C. C. Leiby, R. H. Picard, and C. R. Willis
Opt. Lett. 6(6) 298-300 (1981)

Continuously tunable CH₃F Raman far-infrared laser

Pierre Mathieu and Jerald R. Izatt
Opt. Lett. 6(8) 369-371 (1981)

Sub-Doppler double-resonance spectroscopy of NH₃ using a tunable-diode laser and a CO laser

W. H. Weber and R. W. Terhune
Opt. Lett. 6(10) 455-457 (1981)

Effects of passive isolation on several optically pumped far-infrared laser lines

D. K. Mansfield, G. J. Tesauro, L. C. Johnson, and A. Semet
Opt. Lett. 6(5) 230-232 (1981)