DocumentCode :
1119973
Title :
Cr-TiO2 as an L-band maser material
Author :
Yngvesson, K.S.
Author_Institution :
University of California, Berkeley, CA
Volume :
2
Issue :
7
fYear :
1966
fDate :
7/1/1966 12:00:00 AM
Firstpage :
165
Lastpage :
172
Abstract :
The inverted susceptibility is used as a figure of merit to discuss the maser properties of Cr-TiO2 at 
-band frequencies. This material has the advantage of a high inversion ratio and narrow linewidth resulting in a gain per unit length 10 to 25 times larger than for ruby in the liquid helium temperature range. The optimum concentration of Cr3+is found to be around 0. 016 percent from measured data at 1.4 Gc/s. The gain calculated from the figure of merit agrees with measurements on an actual 1.4 Gc/s traveling-wave maser. The decrease in inversion ratio with increasing Cr3+concentration is an important factor which determines the behavior of the figure of merit. This variation is shown to be consistent with calculations based on a simplified spin-lattice relaxation model.
-band frequencies. This material has the advantage of a high inversion ratio and narrow linewidth resulting in a gain per unit length 10 to 25 times larger than for ruby in the liquid helium temperature range. The optimum concentration of Cr3+is found to be around 0. 016 percent from measured data at 1.4 Gc/s. The gain calculated from the figure of merit agrees with measurements on an actual 1.4 Gc/s traveling-wave maser. The decrease in inversion ratio with increasing Cr3+concentration is an important factor which determines the behavior of the figure of merit. This variation is shown to be consistent with calculations based on a simplified spin-lattice relaxation model.Keywords :
Bandwidth; Energy states; Frequency conversion; Helium; Masers; Physics; Polarization; Saturation magnetization; Temperature distribution; Tunable circuits and devices;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.1966.1074014
Filename :
1074014
Link To Document :
