The operation of a narrow-linewidth optical filter based on the 4P1/2 → 8S1/2 excited-state transition in potassium vapor is reported. The 4P1/2 state is excited by a circularly polarized, 769.9-nm, 10-ns pulse from a dye laser. A linearly polarized, time-sequenced, and spatially overlapped probe pulse at 532.33 nm completes the transition to the 8S1/2 state. The peak filter transmission is ~40% with a bandwidth of less than 4 GHz. Corroborative experimental results suggest that the rotation of probe-pulse polarization by an induced circular birefringence is the dominant mechanism behind the filter operation.
© 1995 Optical Society of America
Original Manuscript: February 3, 1995
Published: June 15, 1995
S. K. Gayen, R. I. Billmers, Guangning Yang, D. M. Allocca, P. R. Herczfeld, V. M. Contarino, M. F. Squicciarini, and W. J. Scharpf, "Induced-dichroism-excited atomic line filter at 532 nm," Opt. Lett. 20, 1427-1429 (1995)