Title :
A novel cladding structure for semiconductor quantum-well lasers with small beam divergence and low threshold current
Author :
Yen, Shun-Tung ; Lee, Chien-Ping
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
9/1/1996 12:00:00 AM
Abstract :
A novel cladding structure is proposed and analyzed for semiconductor quantum-well lasers to achieve a small vertical-beam divergence and a low threshold current density simultaneously. This cladding structure is designed to guide a wide optical mode but with a high peak intensity in quantum wells. The wide expansion of the optical mode results in a small beam divergence. In addition, the high optical Intensity in quantum wells causes a low threshold current density. This novel cladding structure is optimized. The result shows that this type of cladding structures can achieve a beam divergence as small as 14.6° while the threshold current density remains small
Keywords :
claddings; current density; laser beams; laser modes; optical design techniques; quantum well lasers; beam divergence; cladding structure; high optical Intensity; high peak intensity; low threshold current; low threshold current density; semiconductor quantum-well lasers; small beam divergence; small vertical-beam divergence; threshold current density; wide optical mode; Fiber lasers; Laser beams; Laser modes; Optical refraction; Optical sensors; Optical variables control; Pump lasers; Quantum well lasers; Semiconductor lasers; Threshold current;
Journal_Title :
Quantum Electronics, IEEE Journal of
