Title :
Lowering the threshold pump power of Ti,Er:LiNbO3 laser with ridge structure
Author :
Liu, Ju-Feng ; Wang, Yao-Hua ; Chang, Shih-Jung ; Wang, Way-Seen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Ridge structure is used to decrease the effective pump area of coaxially pumped Ti-diffused Er:LiNbO/sub 3/ waveguide laser such that the threshold pump power of the laser is significantly lowered. The normalized propagation constant, effective pump area, and coupling efficiency as functions of the ridge width and depth were calculated for waveguides with different initial Ti strip thicknesses. The results show that the reduction of the threshold pump power can be as large as about 40%, while the slope efficiency is not obviously changed.
Keywords :
erbium; lithium compounds; optical pumping; ridge waveguides; solid lasers; titanium; waveguide lasers; LiNbO/sub 3/:Ti,Er; Ti strip thicknesses; Ti,Er:LiNbO/sub 3/ laser; Ti-diffused Er:LiNbO/sub 3/ waveguide laser; coaxially pumped; coupling efficiency; effective pump area; normalized propagation constant; ridge structure; ridge width; slope efficiency; threshold pump power; Coaxial components; Laser excitation; Laser theory; Lasers and electrooptics; Optical waveguides; Power lasers; Propagation constant; Pump lasers; Strips; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
