We discuss the theory and error analysis for an ultrasensitive refractive index detector based on the two-frequency Zeeman effect laser. Experimental measurements on gases agree fairly well with predictions. With a 5-cm pathlength, the typical interferometry stability is Δn = 8 × 10−9/h. Resolution is Δn = 1 × 10−9.
© 1990 Optical Society of America
Original Manuscript: November 9, 1989
Published: November 1, 1990
Roger G. Johnston and W. Kevin Grace, "Refractive index detector using Zeeman interferometry," Appl. Opt. 29, 4720-4724 (1990)