SCHAWLOW, A. L. (+) G. E. DEVLIN (+) IRWIN WIEDER (+) B. N. TAYLOR.

Simultaneous Optical Maser Action in Two Ruby Satellite Lines (+) Stimulated Optical Emission from Exchange-Coupled Ions of Cr+++ in Al2O2.

New York, American physical Society, 1961. Lex8vo. Entire issue of "Physical Review Letters, Volume 6, Number 3, February 1, 1961" in the original blue/green wrappers. A very nice and clean copy. Pp.96-98; Pp. 95-6. [Entire issue: Pp. 85-161].

First printing of these important papers in the history of the laser.

"An interesting historical footnote is the red ruby laser, demonstrated independently by Schawlow at Bell and by Irwin Wieder at Varian Associates, whose papers both arrived at Physical Review Letters on December 19, 1960, and were published in the same issue.21 Maiman’s laser used "pink" ruby, in which the chromium concentration was low enough that chromium atoms did not interact with each other. At higher concentrations the chromium atoms gave the ruby crystal a deeper red appearance, and their interaction created a four-level laser system with emission lines at 701.0 and 704.1 nm - if the material was cooled to liquid nitrogen temperature. Both Schawlow and Wieder demonstrated flashlamp-pumped lasing on the red ruby laser, but like the uranium and samarium lasers, red ruby never proved practical."

Order-nr.: 44915