Title :
A theoretical study of a Ti-diffused Er:LiNbO3 waveguide laser
Author :
Zhang, Delong ; Chen, Caihe ; Li, Jiang ; Ding, Guilan ; Chen, Xiaojun ; Cui, Yuming
Author_Institution :
Dept. of Precision Instrum. Eng., Tianjin Univ., China
fDate :
10/1/1996 12:00:00 AM
Abstract :
A detailed theoretical procedure of determining the mode sizes of fundamental mode field distribution in a coaxially pumped Ti-diffused Er:LiNbO3 waveguide laser has been described. The mode sizes, effective refractive indexes, effective pump area, and coupling efficiency as a function of the initial Ti stripe width W were numerically calculated for the waveguide with 95- and 100-nm initial Ti stripe thicknesses, respectively. The results indicated that the threshold pump power is severely affected by the stripe width, while slope efficiency is hardly changed as W; both show little difference between 95- and 100-nm stripe thickness. In addition, the stimulated emission cross section of Er3+ in Er:LiNbO3 channel waveguide versus the wavelength were calculated directly from its fluorescence spectra using the β-τ method. Subsequently, threshold pump power and slope efficiency were evaluated
Keywords :
diffusion; erbium; fluorescence; impurity absorption spectra; laser modes; laser theory; lithium compounds; optical couplers; optical pumping; refractive index; solid lasers; stimulated emission; titanium; waveguide lasers; 100 nm; 95 nm; LiNbO3:Er,Ti; Ti-diffused Er:LiNbO3 waveguide laser; coaxially pumped; coupling efficiency; effective pump area; effective refractive indexes; fluorescence spectra; fundamental mode field distribution; initial Ti stripe width; mode sizes; nm stripe thickness; slope efficiency; stimulated emission cross section; theoretical study; threshold pump power; Coaxial components; Erbium; Laser excitation; Laser modes; Laser theory; Pump lasers; Refractive index; Stimulated emission; Waveguide lasers; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
